These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
1

Phenomenology of FourthPhenomenology of Fourth Generation NeutrinosGeneration Neutrinos  

E-print Network

Phenomenology of FourthPhenomenology of Fourth Generation NeutrinosGeneration Neutrinos LindaVGeV mdmd>268>268 GeVGeV LEP neutrinos 101, 102, 90LEP neutrinos 101, 102, 90 GeVGeV in e mu tau channel for Dirac neutrinosin e mu tau channel for Dirac neutrinos 90.7, 89.5, 80.590.7, 89.5, 80.5 GeVGeV forfor

California at Santa Cruz, University of

2

Bounding CKM Mixing with a Fourth Family  

SciTech Connect

CKM mixing between third family quarks and a possible fourth family is constrained by global fits to the precision electroweak data. The dominant constraint is from nondecoupling oblique corrections rather than the vertex correction to Z {yields} {bar b}b used in previous analyses. The possibility of large mixing suggested by some recent analyses of FCNC processes is excluded, but 3-4 mixing of the same order as the Cabbibo mixing of the first two families is allowed.

Chanowitz, Michael S.

2009-04-22

3

Fourth International Conference on Families with Parental Mental Health Challenges  

E-print Network

Fourth International Conference on Families with Parental Mental Health Challenges Sponsored by Conference Information Online: interprofessional.ubc.ca/MentalHealth2014 Addressing the Needs of the Whole Education #12;Fourth International Conference on Families with Parental Mental Health Challenges 2 G E N E R

Michelson, David G.

4

"Silver" mode for heavy Higgs search in the presence of a fourth SM family  

E-print Network

We investigate the possible enhancement to the discovery of the heavy Higgs boson through the possible fourth SM family heavy neutrino. Using the channel h-> v4 v4->mu W mu W-> mu j j mu j j, it is found that for certain ranges of Higgs boson and v4 masses LHC could discover both of them simultaneously with 1 fb^-1 integrated luminosity.

S. Sultansoy; G. Unel

2007-07-22

5

Proposed search for a fourth neutrino with a PBq antineutrino source.  

PubMed

Several observed anomalies in neutrino oscillation data can be explained by a hypothetical fourth neutrino separated from the three standard neutrinos by a squared mass difference of a few eV(2). We show that this hypothesis can be tested with a PBq (ten kilocurie scale) (144)Ce or (106)Ru antineutrino beta source deployed at the center of a large low background liquid scintillator detector. In particular, the compact size of such a source could yield an energy-dependent oscillating pattern in event spatial distribution that would unambiguously determine neutrino mass differences and mixing angles. PMID:22181722

Cribier, Michel; Fechner, Maximilien; Lasserre, Thierry; Letourneau, Alain; Lhuillier, David; Mention, Guillaume; Franco, Davide; Kornoukhov, Vasily; Schönert, Stefan

2011-11-11

6

Fourth-order self-energy of a neutron star due to massive neutrino exchange  

SciTech Connect

We calculate the self-energy of a neutron star to fourth-order in the Fermi constant G{sub F}, arising from neutrino exchange to one loop. We assume the neutron star is comprised entirely of neutrons and use the low-energy Lagrangian describing the interaction between neutrons and massive Dirac neutrinos. The calculation presented here derives from a more rigorous formalism than that used in previous work on the four-body self-energy, and consequently the results differ slightly. We have determined that the fourth-order self-energy, like the recently calculated second-order self-energy, is positive and dependent on the neutron-neutron hard core radius. Importantly, we also show that the fourth-order contribution is greater than the second order. We further demonstrate that, in contrast with the recently calculated vacuum energy shift in which the neutron field is taken to be external, the four-body self-energy decreases in magnitude as the neutrino mass is increased. This decrease of the self-energy as the neutrino mass increases was also the case in the second-order self-energy. The implications of these new findings are discussed.

Woodahl, Brian; Fischbach, Ephraim

2001-03-15

7

Family Life: Literature and Films. An Annotated Bibliography. Supplement to Fourth Revision.  

ERIC Educational Resources Information Center

This supplement to the fourth edition of "Family Life Literature and Films: An Annotated Bibliography" includes materials produced since the publication of the fourth edition (see AC 012 492). The materials are listed under nine topic headings, as follows: I. The American Family: Theoretical, Historical, and Subcultural Perspectives; II. Human…

Pitzer, Ronald L., Ed.

8

Quasi-degenerate neutrinos from an abelian family symmetry  

SciTech Connect

The authors show that models with an abelian family symmetry which accounts for the observed hierarchies of masses and mixings in the quark sector may also accommodate quasi-degeneracies in the neutrino mass spectrum. Such approximate degeneracies are, in this context, associated with large mixing angles. The parameters of this class of models are constrained. The authors discuss their phenomenological implications for present and foreseen neutrino experiments.

Binetruy, P. [Univ. Paris-Sud, Orsay (France). Lab. de Physique Theorique et Hautes Energies]|[Lawrence Berkeley National Lab., CA (United States); Lavignac, S. [Univ. Paris-Sud, Orsay (France). Lab. de Physique Theorique et Hautes Energies; Petcov, S. [Scuola Internazionale Superiore di Studi Avanzati, Trieste (Italy)]|[Ist. Nazionale di Fisica Nucleare, Trieste (Italy). Sezione di Trieste; Ramond, P. [Florida Univ., Gainesville, FL (United States). Inst. for Fundamental Theory

1996-12-31

9

General Majorana Neutrino Mass Matrix from a Low Energy SU(3) Family Symmetry with Sterile Neutrinos  

E-print Network

Within the framework of a local SU(3) family symmetry model, we report a general analysis of the mechanism for neutrino mass generation and mixing, including light sterile neutrinos. In this scenario, ordinary heavy fermions, top and bottom quarks and tau lepton, become massive at tree level from Dirac See-saw mechanisms implemented by the introduction of a new set of $SU(2)_L$ weak singlet vector-like fermions, U,D,E,N, with N a sterile neutrino. Right-handed and the $N_{L,R}$ sterile neutrinos allow the implementation of a 8x8 general Majorana neutrino mass matrix with four or five massless neutrinos at tree level. Hence, light fermions, including light neutrinos get masses from radiative corrections mediated by the massive SU(3) gauge bosons. We report the corresponding Majorana neutrino mass matrix up to one loop. Previous numerical analysis of the free parameters show out solutions for quarks and charged lepton masses within a parameter space region where the vector-like fermion masses $M_U, M_D, M_E$, a...

Hernandez-Galeana, Albino

2014-01-01

10

Developing Cross-Cultural Competence: A Guide for Working with Children and Their Families. Fourth Edition  

ERIC Educational Resources Information Center

As the U.S. population grows more and more diverse, how can professionals who work with young children and families deliver the best services while honoring different customs, beliefs, and values? The answers are in the fourth edition of this bestselling textbook, fully revised to reflect nearly a decade of population changes and best practices in…

Lynch, Eleanor W., Ed.; Hanson, Marci J., Ed.

2011-01-01

11

Thinking beyond Measurement, Description and Judgment: Fourth Generation Evaluation in Family-Centered Pediatric Healthcare Organizations  

ERIC Educational Resources Information Center

Background: Although pediatric healthcare organizations have widely implemented the philosophy of family-centered care (FCC), evaluators and health professionals have not explored how to preserve the philosophy of FCC in evaluation processes. Purpose: To illustrate how fourth generation evaluation, in theory, could facilitate collaboration between…

Moreau, Katherine Ann; Clarkin, Chantalle Louise

2012-01-01

12

Neutrinos  

E-print Network

In these lectures the following topics are considered: historical remarks and general properties, Dirac and Majorana neutrino masses, effective lagrangian approach, the seesaw mechanism, the number of active left-hauded neutrino species, the light neutrino mass matrix, the direct measurement of neutrino masses, double beta decay, neutrino oscillations in vacuum and neutrino oscillations in matter.

J. Bernabeu

2000-12-22

13

A Pilot Family Practice Clerkship for Third and Fourth Year Students.  

ERIC Educational Resources Information Center

A clinical clerkship that provides medical students the opportunity to learn side by side with family practice residents is described. Clerkship objectives are to expose the student to: a variety of health care settings with the individual and family as the primary focus; ambulatory care of patients with conditions commonly seen by family…

Moseley, James L.

14

Family-Based Short Breaks (Respite) for Disabled Children: Results from the Fourth National Survey  

Microsoft Academic Search

A survey of family-based short breaks for disabled children in the UK was undertaken in order to investigate the state of current services. The research builds on the work of previous surveys and takes the perspective of the service co-ordinators. The findings show that family-based short breaks are rapidly changing and diversifying. The number of schemes with contract carers has

Helen Cramer; Jeanne Carlin

2008-01-01

15

Higgs boson mass bounds in the presence of a heavy fourth quark family  

E-print Network

We present Higgs boson mass bounds in a lattice regularization allowing thus for non-perturbative investigations. In particular, we employ a lattice modified chiral invariant Higgs-Yukawa model using the overlap operator. We show results for the upper and lower Higgs boson mass bounds in the presence of a heavy mass-degenerate quark doublet with masses ranging up to 700 GeV. We perform infinite volume extrapolations in most cases, and examine several values of the lattice cutoff. Furthermore, we argue that the lower Higgs boson mass bound is stable with respect to the addition of higher dimensional operators to the scalar field potential. Our results have severe consequences for the phenomenology of a fourth generation of quarks if a light Higgs boson is discovered at the LHC.

John Bulava; Philipp Gerhold; Karl Jansen; Jim Kallarackal; Attila Nagy

2013-01-16

16

FOURTH ANNUAL CONFERENCE ON FAMILIES WHO FOLLOW THE CROPS (BAKERSFIELD, FEBRUARY 27-28, 1964).  

ERIC Educational Resources Information Center

A CONFERENCE WAS HELD TO EXAMINE THE REALITIES OF PROBLEMS OF MIGRANT WORKERS FROM THE POINTS OF VIEW OF THE GROWER, THE WORKER, THE CONSUMER, AND THE STATE OF CALIFORNIA. THE TREND HAS BEEN TOWARD MECHANIZING AGRICULTURE, CEASING THE IMPORTATION OF BRACEROS AND OTHER FOREIGN LABOR, AND RECRUITING MANY NEW FAMILIES TO AGRICULTURE FOR DOMESTIC…

MCALLISTER, BARD; AND OTHERS

17

Neutrinos  

PubMed Central

Neutrinos represent a new “window” to the Universe, spanning a large range of energy. We discuss the science of neutrino astrophysics and focus on two energy regimes. At “lower” energies (?1 MeV), studies of neutrinos born inside the sun, or produced in interactions of cosmic rays with the atmosphere, have allowed the first incontrovertible evidence that neutrinos have mass. At energies typically one thousand to one million times higher, sources further than the sun (both within the Milky Way and beyond) are expected to produce a flux of particles that can be detected only through neutrinos. PMID:10588680

Besson, Dave; Cowen, Doug; Selen, Mats; Wiebusch, Christopher

1999-01-01

18

Neutrinos  

NASA Astrophysics Data System (ADS)

Neutrinos are electrically neutral ELEMENTARY PARTICLES which experience only the weak nuclear force and gravity. Their existence was introduced as a hypothesis by Wolfgang Pauli in 1930 to explain the apparent violation of energy conservation in radioactive beta decay. Chadwick had discovered in 1914 that the energy spectrum of electrons emitted in beta decay was not monoenergetic but continuous...

Winter, K.; Murdin, P.

2000-11-01

19

Supporting Low-Income Parents of Young Children: The Palm Beach County Family Study Fourth Annual Report  

ERIC Educational Resources Information Center

The Children's Services Council (CSC) of Palm Beach County funded Chapin Hall at the University of Chicago to conduct a 6-year longitudinal study to examine the use and effectiveness of an array of services in the county in promoting school readiness and school success and improving family functioning among children and families most in need of…

Spielberger, Julie; Rich, Lauren; Winje, Carolyn; Scannell, Molly

2010-01-01

20

Abelian family symmetries and the simplest models that give theta13=0 in the neutrino mixing matrix  

E-print Network

I construct predictive models of neutrino mass and mixing that have fewer parameters, both in the lepton sector and overall, than the default seesaw model. The predictions are theta13=0 and one massless neutrino, with the models having a Z4 or Z2 symmetry and just one extra degree of freedom: one real singlet Higgs field. It has been shown that models with an unbroken family symmetry, and with no Higgs fields other than the Standard Model Higgs doublet produce masses and mixing matrices that have been ruled out by experiment. Therefore, this article investigates the predictions of models with Abelian family symmetries that involve Higgs singlets, doublets and triplets, in the hope that they may produce the maximal and minimal mixing angles seen in the best fit neutrino mixing matrix. I demonstrate that these models can only produce mixing angles that are zero, maximal or unconfined by the symmetry. The maximal mixing angles do not correspond to physical mixing, so an Abelian symmetry can, at best, ensure that theta13=0, while leaving the solar and atmospheric mixing angles as free parameters. To generate more features of the best-fit mixing matrix a model with a non-Abelian symmetry and a complicated Higgs sector would have to be used.

Catherine I. Low

2005-01-27

21

Ligand-specific activation of HER4/p180erbB4, a fourth member of the epidermal growth factor receptor family.  

PubMed Central

This report describes the isolation and recombinant expression of a cDNA clone encoding HER4, the fourth member of the human epidermal growth factor receptor (EGFR) family. The HER4/erbB4 gene encodes a 180-kDa transmembrane tyrosine kinase (HER4/p180erbB4) whose extracellular domain is most similar to the orphan receptor HER3/p160erbB3, whereas its cytoplasmic kinase domain exhibits 79% and 77% identity with EGFR and HER2/p185erbB2, respectively. HER4 is most predominantly expressed in several breast carcinoma cell lines, and in normal skeletal muscle, heart, pituitary, brain, and cerebellum. In addition, we describe the partial purification of a heparin-binding HER4-stimulatory factor from HepG2 cells. This protein was found to specifically stimulate the intrinsic tyrosine kinase activity of HER4/p180erbB4 while having no direct effect on the phosphorylation of EGFR, HER2, or HER3. Furthermore, this heparin-binding protein induces phenotypic differentiation, and tyrosine phosphorylation, of a human mammary tumor cell line that overexpresses both HER4 and HER2. These findings suggest that this ligand-receptor interaction may play a role in the growth and differentiation of some normal and transformed cells. Images Fig. 2 Fig. 3 Fig. 4 PMID:8383326

Plowman, G D; Culouscou, J M; Whitney, G S; Green, J M; Carlton, G W; Foy, L; Neubauer, M G; Shoyab, M

1993-01-01

22

Fourth generation parity.  

PubMed

We present a very simple fourth generation (4G) model with an abelian gauge interaction under which only the 4G fermions have nonzero charge. The U(1) gauge symmetry can have a Z2 residual discrete symmetry (4G parity), which can stabilize the lightest 4G particle (L4P). When the 4G neutrino is the L4P, it would be a neutral and stable particle and the other 4G fermions would decay into the L4P, leaving the trace of missing energy plus the standard model fermions. Because of the new symmetry, the 4G particle creation and decay modes are different from those of the sequential 4G model, and the 4G particles can be appreciably lighter than typical experimental bounds. PMID:23383889

Lee, Hye-Sung; Soni, Amarjit

2013-01-11

23

Electromagnetic properties of massive neutrinos  

SciTech Connect

The vertex function for a virtual massive neutrino is calculated in the limit of soft real photons. A method based on employing the neutrino self-energy operator in a weak external electromagnetic field in the approximation linear in the field is developed in order to render this calculation of the vertex function convenient. It is shown that the electric charge and the electric dipole moment of the real neutrino are zero; only the magnetic moment is nonzero for massive neutrinos. A fourth-generation heavy neutrino of mass not less than half of the Z-boson mass is considered as a massive neutrino.

Dobrynina, A. A., E-mail: aleksandradobrynina@rambler.ru; Mikheev, N. V.; Narynskaya, E. N. [Demidov Yaroslavl State University (Russian Federation)] [Demidov Yaroslavl State University (Russian Federation)

2013-10-15

24

Genetic heterogeneity of FG syndrome: a fourth locus (FGS4) maps to Xp11.4-p11.3 in an Italian family  

Microsoft Academic Search

FG syndrome (FGS, MIM 305450) is a rare X-linked recessive disorder comprising mental retardation and multiple malformations. Various families have been described to date, increasing our knowledge of the phenotype variability and making the clinical diagnosis complex, especially in sporadic patients. The first locus for FG syndrome (FGS1) was linked to chromosome region Xq12-q21.31, but other families have been excluded

Giulio Piluso; Massimo Carella; Michele D'Avanzo; Raffaele Santinelli; Elena Carrano; Angelo D'Avanzo; Adamo D'Adamo; Paolo Gasparini; Vincenzo Nigro

2003-01-01

25

See-saw mechanism and four light neutrino state  

E-print Network

A formal proof is given that in a see-saw type neutrino mass matrix with only two neutrino mass scales ($m_D \\ll m_R$) and the maximal rank of $m_{R(D)}$, we can not get a fourth light sterile neutrino.

M. Czakon; J. Gluza; M. Zralek

2001-07-30

26

Neutrino physics  

Microsoft Academic Search

In the present lectures the following topics are considered: general properties of neutrinos, neutrino mass phenomenology (Dirac and Majorana masses), neutrino masses in the simplest extensions of the standard model (including the seesaw mech- anism), neutrino oscillations in vacuum, neutrino oscillations in matter (the MSW effect) in 2- and 3-flavour schemes, implications of CP, T and CPT symmetries for neutrino

E. Kh

27

Massive neutrinos and neutrino oscillations  

Microsoft Academic Search

The theory of neutrino mixing and neutrino oscillations, as well as the properties of massive neutrinos (Dirac and Majorana), are reviewed. More specifically, the following topics are discussed in detail: (i) the possible types of neutrino mass terms; (ii) oscillations of neutrinos (iii) the implications of CP invariance for the mixing and oscillations of neutrinos in vacuum; (iv) possible varieties

S. M. Bilenky; S. T. Petcov

1987-01-01

28

Neutrino Experiments  

SciTech Connect

Recent studies of neutrino oscillations have established the existence of finite neutrino masses and mixing between generations of neutrinos. The combined results from studies of atmospheric neutrinos, solar neutrinos, reactor antineutrinos and neutrinos produced at accelerators paint an intriguing picture that clearly requires modification of the standard model of particle physics. These results also provide clear motivation for future neutrino oscillation experiments as well as searches for direct neutrino mass and nuclear double-beta decay. I will discuss the program of new neutrino oscillation experiments aimed at completing our knowledge of the neutrino mixing matrix.

McKeown, R. D. [W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, CA (United States)

2010-08-04

29

Neutrino Oscillations with Reactor Neutrinos  

E-print Network

Prospect measurements of neutrino oscillations with reactor neutrinos are reviewed in this document. The following items are described: neutrinos oscillations status, reactor neutrino experimental strategy, impact of uncertainties on the neutrino oscillation sensitivity and, finally, the experiments in the field. This is the synthesis of the talk delivered during the NOW2006 conference at Otranto (Italy) during September 2006.

Anatael Cabrera

2007-01-11

30

Neutrino Physics  

E-print Network

These lectures describe some aspects of the physics of massive neutrinos. After a brief introduction of neutrinos in the Standard Model, I discuss possible patterns for their masses. In particular, I show how the presence of a large Majorana mass term for the right-handed neutrinos can engender tiny neutrino masses for the observed neutrinos. If neutrinos have mass, different flavors of neutrinos can oscillate into one another. To analyze this phenomena, I develop the relevant formalism for neutrino oscillations, both in vacuum and in matter. After reviewing the existing (negative) evidence for neutrino masses coming from direct searches, I discuss evidence for, and hints of, neutrino oscillations in the atmosphere, the sun, and at accelerators. Some of the theoretical implications of these results are emphasized. I close these lectures by briefly outlining future experiments which will shed further light on atmospheric, accelerator and solar neutrino oscillations. A pedagogical discussion of Dirac and Majora...

Peccei, Roberto D

1999-01-01

31

Higgs Search Constraints on Fourth Generation Scenarios with General Lepton Sectors  

E-print Network

I present a general exclusion bound for the Higgs in fourth generation scenarios with a general lepton sector. Recent Higgs searches in fourth generation scenarios rule out the entire Higgs mass region between 120 and 600 GeV. That such a large range of Higgs masses are excluded is due to the presence of extra heavy flavors of quarks, which substantially increase Higgs production from gluon fusion over the Standard Model rate. However, if heavy fourth generation neutrinos are less than half of the Higgs mass, they can dominate the Higgs decay branching fraction, overtaking the standard Higgs to WW* decay rate. The Higgs mass exclusion in a fourth generation scenario is shown most generally to be 155-600 GeV, and is highly dependent on the fourth generation neutrino mixing parameter.

Linda M. Carpenter

2011-10-21

32

Fourth goal of perinatal medicine.  

PubMed Central

Reduction in maternal mortality, infant mortality, and infant morbidity have been successively the goals of perinatal medicine. The fourth is to reduce bonding failure. In July 1978 a preventive service was started in the John Radcliffe Maternity Hospital. A twice-weekly round is made. Midwives refer families who cause them concern. In the first year the referral rate ws 20.5 per 1000 liveborn babies. The referred sample differed from the hospital population in terms of maternal psychiatric history, marital state and babies' admission to special care. The main reasons for referral were: doubt about parenting ability (27%), psychiatric history (15%), disturbed behaviour in hospital (14%), and diffuse social and medical problems (17%). Long-term care was needed for only 14% of families. At their first birthdays, six babies were placed away from their natural parents; the sample had had a slightly higher than expected admission rate to hospital; the distribution of weights did not differ from the expected; doctors and health visitors were still concerned about one-quarter of the families. Seven cases of screening failure were found among those not referred to our service, but only one was seriously abused. No child referred in the first year has been seriously neglected or abused. PMID:6802338

Ounsted, C; Roberts, J C; Gordon, M; Milligan, B

1982-01-01

33

Sterile neutrinos?  

E-print Network

The notion of sterile neutrinos is discussed. The schemes of mixing of four massive neutrinos, which imply the existence of sterile neutrinos, are briefly considered. Several model independent methods that allow to reveal possible transitions of solar neutrinos into sterile states are presented.

S. M. Bilenky; C. Giunti

1999-05-05

34

Solar Neutrinos  

E-print Network

Present results and future measurements of solar neutrinos are discussed. The results to date indicate that solar electron neutrinos are changing to other active types and that transitions solely to sterile neutrinos are disfavored. The flux of $^{8}B$ solar neutrinos produced in the Sun, inferred assuming only active neutrino types, is found to be in very good agreement with solar model calculations. Future measurements will focus on greater accuracy for charged current and neutral current sensitive reactions to provide more accurate measurements of neutrino flavour change and further studies of day-night flux differences and spectral shape. Other experiments sensitive to lower energy solar neutrinos will be in operation soon.

A. B. McDonald

2002-09-21

35

Fourth Grade Lab Activities  

NSDL National Science Digital Library

These are a collection of sites related to the Fourth Grade CORE, to be explored in the computer lab. For SCIENCE explorations click below. 1. Clouds and the water cycle at the Enchanted Learning site. 2. Look at the Cloud Man&s pictures of clouds. 3. Cloud Types 4. Clouds and Precipitation: online meteorology guide 5. The Dirt on Soil 6. The Dirt on Soil 7. Soil Horizons For MATH activities click below. Math activities "A" ...

Boissonnault, Ms.

2005-06-23

36

Tau Neutrino Appearance via Neutrino Oscillations in Atmospheric Neutrinos  

E-print Network

Tau Neutrino Appearance via Neutrino Oscillations in Atmospheric Neutrinos A Dissertation Presented of the Dissertation Tau Neutrino Appearance via Neutrino Oscillations in Atmospheric Neutrinos by Tokufumi Kato Doctor of Philosophy in Physics Stony Brook University 2007 A search for the appearance of tau neutrinos from µ

Tokyo, University of

37

Neutrino Detectors  

NASA Astrophysics Data System (ADS)

The neutrino was postulated by Wolfgang Pauli in the early 1930s, but could only be detected for the first time in the 1950s. Ever since scientists all around the world have worked on the detection and understanding of this particle which so scarcely interacts with matter. Depending on the origin and nature of the neutrino, various types of experiments have been developed and operated. In this entry, we will review neutrino detectors in terms of neutrino energy and associated detection technique as well as the scientific outcome of some selected examples. After a brief historical introduction, the detection of low-energy neutrinos originating from nuclear reactors or from the Earth is used to illustrate the principles and difficulties which are encountered in detecting neutrinos. In the context of solar neutrino spectroscopy, where the neutrino is used as a probe for astrophysics, three different types of neutrino detectors are presented - water ?erenkov, radiochemical, and liquid-scintillator detectors. Moving to higher neutrino energies, we discuss neutrinos produced by astrophysical sources and from accelerators. The entry concludes with an overview of a selection of future neutrino experiments and their scientific goals.

von Feilitzsch, Franz; Lanfranchi, Jean-Côme; Wurm, Michael

38

An Anatomy of Neutrino Oscillations  

E-print Network

To understand neutrino oscillations with neutrinos treated as point-like Dirac particles, we describe how to use an off-diagonal (cross-generation) neutrino-Higgs (mass) interaction to simulate oscillations in a natural way. This results in an extra orthogonal $SU_f(3)$ family gauge theory, which cooperates with the Minimal Standard Model to form a unique extended Standard Model (i.e., our Standard Mode). Altogether, it helps us to resolve a few outstanding puzzles - the question of why there are only three generations, the question of why the masses of neutrinos are so tiny, the question of why neutrinos oscillate, and the question of why the dark-matter world is so huge (25%) as compared to the visible ordinary-matter world (5%).

W-Y. Pauchy Hwang

2014-11-03

39

Neutrino Lensing  

E-print Network

Due to the intrinsic properties of neutrinos, the gravitational lens effect for neutrino should be more colorful and meaningful than the normal lens effect of photon. Other than the oscillation experiments operated at terrestrial laboratory, in principle, we can propose a completely new astrophysical method to determine not only the nature of gravity and spacetime of lens objects but also the mixing parameters of neutrinos by analyzing neutrino trajectories near the central objects. However, compared with the contemporaneous telescopes through the observation of the electromagnetic radiation, the angular, energy and time resolution of the neutrino telescopes are still comparatively poor, we just concentrate on the two classical tests of general relativity, i.e. the angular deflection and time delay of neutrino by a lens object as a preparative work in this paper. In addition, some simple properties of neutrino lensing are investigated.

Luo Xin-Lian

2009-09-28

40

Search for Majorana neutrinos in B- ? ?+ ?- ?- decays.  

PubMed

A search for heavy Majorana neutrinos produced in the B- ? ?+ ?- ?- decay mode is performed using 3??fb(-1) of integrated luminosity collected with the LHCb detector in pp collisions at center-of-mass energies of 7 and 8 TeV at the LHC. Neutrinos with masses in the range 250 to 5000 MeV and lifetimes from zero to 1000 ps are probed. In the absence of a signal, upper limits are set on the branching fraction B(B- ? ?+ ?- ?-) as functions of neutrino mass and lifetime. These limits are on the order of 10(-9) for short neutrino lifetimes of 1 ps or less. Limits are also set on the coupling between the muon and a possible fourth-generation neutrino. PMID:24745405

Aaij, R; Adeva, B; Adinolfi, M; Affolder, A; Ajaltouni, Z; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves, A A; Amato, S; Amerio, S; Amhis, Y; Anderlini, L; Anderson, J; Andreassen, R; Andreotti, M; Andrews, J E; Appleby, R B; Aquines Gutierrez, O; Archilli, F; Artamonov, A; Artuso, M; Aslanides, E; Auriemma, G; Baalouch, M; Bachmann, S; Back, J J; Badalov, A; Balagura, V; Baldini, W; Barlow, R J; Barschel, C; Barsuk, S; Barter, W; Batozskaya, V; Bauer, T; Bay, A; Beddow, J; Bedeschi, F; Bediaga, I; Belogurov, S; Belous, K; Belyaev, I; Ben-Haim, E; Bencivenni, G; Benson, S; Benton, J; Berezhnoy, A; Bernet, R; Bettler, M-O; van Beuzekom, M; Bien, A; Bifani, S; Bird, T; Bizzeti, A; Bjørnstad, P M; Blake, T; Blanc, F; Blouw, J; Blusk, S; Bocci, V; Bondar, A; Bondar, N; Bonivento, W; Borghi, S; Borgia, A; Borsato, M; Bowcock, T J V; Bowen, E; Bozzi, C; Brambach, T; van den Brand, J; Bressieux, J; Brett, D; Britsch, M; Britton, T; Brook, N H; Brown, H; Bursche, A; Busetto, G; Buytaert, J; Cadeddu, S; Calabrese, R; Callot, O; Calvi, M; Calvo Gomez, M; Camboni, A; Campana, P; Campora Perez, D; Carbone, A; Carboni, G; Cardinale, R; Cardini, A; Carranza-Mejia, H; Carson, L; Carvalho Akiba, K; Casse, G; Castillo Garcia, L; Cattaneo, M; Cauet, C; Cenci, R; Charles, M; Charpentier, P; Cheung, S-F; Chiapolini, N; Chrzaszcz, M; Ciba, K; Cid Vidal, X; Ciezarek, G; Clarke, P E L; Clemencic, M; Cliff, H V; Closier, J; Coca, C; Coco, V; Cogan, J; Cogneras, E; Collins, P; Comerma-Montells, A; Contu, A; Cook, A; Coombes, M; Coquereau, S; Corti, G; Counts, I; Couturier, B; Cowan, G A; Craik, D C; Cruz Torres, M; Cunliffe, S; Currie, R; D'Ambrosio, C; Dalseno, J; David, P; David, P N Y; Davis, A; De Bonis, I; De Bruyn, K; De Capua, S; De Cian, M; De Miranda, J M; De Paula, L; De Silva, W; De Simone, P; Decamp, D; Deckenhoff, M; Del Buono, L; Déléage, N; Derkach, D; Deschamps, O; Dettori, F; Di Canto, A; Dijkstra, H; Donleavy, S; Dordei, F; Dorigo, M; Dorosz, P; Dosil Suárez, A; Dossett, D; Dovbnya, A; Dupertuis, F; Durante, P; Dzhelyadin, R; Dziurda, A; Dzyuba, A; Easo, S; Egede, U; Egorychev, V; Eidelman, S; Eisenhardt, S; Eitschberger, U; Ekelhof, R; Eklund, L; El Rifai, I; Elsasser, C; Falabella, A; Färber, C; Farinelli, C; Farry, S; Ferguson, D; Fernandez Albor, V; Ferreira Rodrigues, F; Ferro-Luzzi, M; Filippov, S; Fiore, M; Fiorini, M; Fitzpatrick, C; Fontana, M; Fontanelli, F; Forty, R; Francisco, O; Frank, M; Frei, C; Frosini, M; Furfaro, E; Gallas Torreira, A; Galli, D; Gandelman, M; Gandini, P; Gao, Y; Garofoli, J; Garra Tico, J; Garrido, L; Gaspar, C; Gauld, R; Gersabeck, E; Gersabeck, M; Gershon, T; Ghez, P; Gianelle, A; Gibson, V; Giubega, L; Gligorov, V V; Göbel, C; Golubkov, D; Golutvin, A; Gomes, A; Gordon, H; Grabalosa Gándara, M; Graciani Diaz, R; Granado Cardoso, L A; Graugés, E; Graziani, G; Grecu, A; Greening, E; Gregson, S; Griffith, P; Grillo, L; Grünberg, O; Gui, B; Gushchin, E; Guz, Y; Gys, T; Hadjivasiliou, C; Haefeli, G; Haen, C; Hafkenscheid, T W; Haines, S C; Hall, S; Hamilton, B; Hampson, T; Hansmann-Menzemer, S; Harnew, N; Harnew, S T; Harrison, J; Hartmann, T; He, J; Head, T; Heijne, V; Hennessy, K; Henrard, P; Hernando Morata, J A; van Herwijnen, E; Heß, M; Hicheur, A; Hill, D; Hoballah, M; Hombach, C; Hulsbergen, W; Hunt, P; Huse, T; Hussain, N; Hutchcroft, D; Hynds, D; Iakovenko, V; Idzik, M; Ilten, P; Jacobsson, R; Jaeger, A; Jans, E; Jaton, P; Jawahery, A; Jing, F; John, M; Johnson, D; Jones, C R; Joram, C; Jost, B; Jurik, N; Kaballo, M; Kandybei, S; Kanso, W; Karacson, M; Karbach, T M; Kenyon, I R; Ketel, T; Khanji, B; Khurewathanakul, C; Klaver, S; Kochebina, O; Komarov, I; Koopman, R F; Koppenburg, P; Korolev, M; Kozlinskiy, A; Kravchuk, L; Kreplin, K; Kreps, M; Krocker, G; Krokovny, P; Kruse, F; Kucharczyk, M; Kudryavtsev, V; Kurek, K; Kvaratskheliya, T; La Thi, V N; Lacarrere, D; Lafferty, G; Lai, A; Lambert, D; Lambert, R W; Lanciotti, E; Lanfranchi, G; Langenbruch, C; Latham, T; Lazzeroni, C; Le Gac, R; van Leerdam, J; Lees, J-P; Lefèvre, R; Leflat, A; Lefrançois, J; Leo, S; Leroy, O; Lesiak, T; Leverington, B; Li, Y; Liles, M; Lindner, R; Linn, C; Lionetto, F; Liu, B; Liu, G; Lohn, S; Longstaff, I; Lopes, J H; Lopez-March, N; Lowdon, P; Lu, H; Lucchesi, D; Luisier, J; Luo, H; Luppi, E; Lupton, O; Machefert, F; Machikhiliyan, I V; Maciuc, F; Maev, O; Malde, S; Manca, G; Mancinelli, G; Manzali, M; Maratas, J; Marconi, U; Marino, P; Märki, R; Marks, J; Martellotti, G; Martens, A; Martín Sánchez, A; Martinelli, M; Martinez Santos, D; Martins Tostes, D; Massafferri, A; Matev, R; Mathe, Z; Matteuzzi, C; Mazurov, A; McCann, M; McCarthy, J; McNab, A; McNulty, R; McSkelly, B; Meadows, B; Meier, F; Meissner, M; Merk, M; Milanes, D A; Minard, M-N; Molina Rodriguez, J; Monteil, S; Moran, D; Morandin, M

2014-04-01

41

An Anatomy of Neutrino Oscillations  

E-print Network

To understand neutrino oscillations in the sense of quantum mechanics or quantum field theory, we describe how to use an off-diagonal (cross-generation) neutrino-Higgs(mass) interaction to simulate oscillations in a natural way. This results in an extra orthogonal SU_f (3) family gauge theory, which may help us to resolve a few outstanding puzzles - the question of why there are only three generations, the question of why the masses of neutrinos are so tiny, and the question of why the dark-matter world is so huge (25%) as compared to the visible ordinary-matter world (5%).

Hwang, W-Y Pauchy

2012-01-01

42

Neutrino factory  

NASA Astrophysics Data System (ADS)

The properties of the neutrino provide a unique window on physics beyond that described by the standard model. The study of subleading effects in neutrino oscillations, and the race to discover CP-invariance violation in the lepton sector, has begun with the recent discovery that ?13>0 . The measured value of ?13 is large, emphasizing the need for a facility at which the systematic uncertainties can be reduced to the percent level. The neutrino factory, in which intense neutrino beams are produced from the decay of muons, has been shown to outperform all realistic alternatives and to be capable of making measurements of the requisite precision. Its unique discovery potential arises from the fact that only at the neutrino factory is it practical to produce high-energy electron (anti)neutrino beams of the required intensity. This paper presents the conceptual design of the neutrino factory accelerator facility developed by the European Commission Framework Programme 7 EURO ? Design Study consortium. EURO ? coordinated the European contributions to the International Design Study for the Neutrino Factory (the IDS-NF) collaboration. The EURO ? baseline accelerator facility will provide 1 021 muon decays per year from 12.6 GeV stored muon beams serving a single neutrino detector situated at a source-detector distance of between 1 500 km and 2 500 km. A suite of near detectors will allow definitive neutrino-scattering experiments to be performed.

Bogomilov, M.; Matev, R.; Tsenov, R.; Dracos, M.; Bonesini, M.; Palladino, V.; Tortora, L.; Mori, Y.; Planche, T.; Lagrange, J. B.; Kuno, Y.; Benedetto, E.; Efthymiopoulos, I.; Garoby, R.; Gilardoini, S.; Martini, M.; Wildner, E.; Prior, G.; Blondel, A.; Karadzhow, Y.; Ellis, M.; Kyberd, P.; Bayes, R.; Laing, A.; Soler, F. J. P.; Alekou, A.; Apollonio, M.; Aslaninejad, M.; Bontoiu, C.; Jenner, L. J.; Kurup, A.; Long, K.; Pasternak, J.; Zarrebini, A.; Poslimski, J.; Blackmore, V.; Cobb, J.; Tunnell, C.; Andreopoulos, C.; Bennett, J. R. J.; Brooks, S.; Caretta, O.; Davenne, T.; Densham, C.; Edgecock, T. R.; Fitton, M.; Kelliher, D.; Loveridge, P.; McFarland, A.; Machida, S.; Prior, C.; Rees, G.; Rogers, C.; Rooney, M.; Thomason, J.; Wilcox, D.; Booth, C.; Skoro, G.; Back, J. J.; Harrison, P.; Berg, J. S.; Fernow, R.; Gallardo, J. C.; Gupta, R.; Kirk, H.; Simos, N.; Stratakis, D.; Souchlas, N.; Witte, H.; Bross, A.; Geer, S.; Johnstone, C.; Makhov, N.; Neuffer, D.; Popovic, M.; Strait, J.; Striganov, S.; Morfín, J. G.; Wands, R.; Snopok, P.; Bagacz, S. A.; Morozov, V.; Roblin, Y.; Cline, D.; Ding, X.; Bromberg, C.; Hart, T.; Abrams, R. J.; Ankenbrandt, C. M.; Beard, K. B.; Cummings, M. A. C.; Flanagan, G.; Johnson, R. P.; Roberts, T. J.; Yoshikawa, C. Y.; Graves, V. B.; McDonald, K. T.; Coney, L.; Hanson, G.

2014-12-01

43

Testing the Reactor and Gallium Anomalies with Intense (Anti)Neutrino Emitters  

E-print Network

Several observed anomalies in neutrino oscillation data could be explained by a hypothetical fourth neutrino separated from the three standard neutrinos by a squared mass difference of a few 0.1 eV$^2$ or more. This hypothesis can be tested with MCi neutrino electron capture sources ($^{51}$Cr) or kCi antineutrino $\\beta$-source ($^{144}$Ce) deployed inside or next to a large low background neutrino detector. In particular, the compact size of this source coupled with the localization of the interaction vertex lead to an oscillating pattern in event spatial (and possibly energy) distributions that would unambiguously determine neutrino mass differences and mixing angles.

Th. Lasserre

2012-09-23

44

Computational Analysis of the Bugey Neutrino Oscillation Experiment  

NASA Astrophysics Data System (ADS)

The Bugey 3-Detector neutrino experiment attempted to place a limit on ?m^21,2 and 2?(2?1,2) by calculating neutrino fluxes from a nuclear reactor. This experiment was unusual because it utilized data taken from three different distances from the neutrino source. The experiment concluded that neutrinos did not oscillate between flavors. However, this conclusion was later contradicted and overruled by data from more accurate neutrino oscillation experiments, and recent discoveries suggest that a fourth neutrino may exist. To help determine the plausibility of a four neutrino model we are reexamining data from the Bugey experiment. Although our attempts to recreate the original experimenter's results have yielded some success, we have not yet been able to fully recreate the original experimenters' results.

Yost, Mason

2012-03-01

45

Neutrino oscillometry  

NASA Astrophysics Data System (ADS)

Neutrino oscillations are studied employing sources of low energy monoenergetic neutrinos following electron capture by the nucleus and measuring electron recoils. Since the neutrino energy is very low the oscillation length L23 appearing in this electronic neutrino disappearance experiment can be so small that the full oscillation can take place inside the detector so that one may determine very accurately the neutrino oscillation parameters. In particular, since the oscillation probability is proportional to sin2 2?13, one can measure or set a better limit on the unknown parameter ?13. One, however, has to pay the price that the expected counting rates are very small. Thus one needs a very intensive neutrino source and a large detector with as low as possible energy threshold and high energy and position resolution. Both spherical gaseous and cylindrical liquid detectors are studied. Different source candidates are considered.

Vergados, J. D.; Giomataris, Y.; Novikov, Yu. N.

2012-08-01

46

Neutrino Observatories  

NSDL National Science Digital Library

This online article, from Cosmic Horizons: Astronomy at the Cutting Edge, takes an in-depth look at the new generation of astronomy equipment. It provides an overview of the discovery of neutrinos, subatomic particles, and their role in the developing field of physics, studies that showed that nuclear reactions, including those that power the stars, produce an enormous number of neutrinos, the creation of neutrino observatories deep underground and the stunning and unexpected advances these observatories have already made.

47

Atmospheric neutrinos and discovery of neutrino oscillations  

PubMed Central

Neutrino oscillation was discovered through studies of neutrinos produced by cosmic-ray interactions in the atmosphere. These neutrinos are called atmospheric neutrinos. They are produced as decay products in hadronic showers resulting from collisions of cosmic rays with nuclei in the atmosphere. Electron-neutrinos and muon-neutrinos are produced mainly by the decay chain of charged pions to muons to electrons. Atmospheric neutrino experiments observed zenith-angle and energy dependent deficit of muon-neutrino events. Neutrino oscillations between muon-neutrinos and tau-neutrinos explain these data well. Neutrino oscillations imply that neutrinos have small but non-zero masses. The small neutrino masses have profound implications to our understanding of elementary particle physics and the Universe. This article discusses the experimental discovery of neutrino oscillations. PMID:20431258

Kajita, Takaaki

2010-01-01

48

Solar Neutrinos  

E-print Network

Solar neutrino investigation has represented one of the most active field of particle physics over the past decade, accumulating important and sometimes unexpected achievements. After reviewing some of the most recent impressive successes, the future perspectives of this exciting area of neutrino research will be discussed.

Bellini, G.; Ranucci, G.

2010-01-01

49

Neutrino astronomy  

SciTech Connect

Current knowledge and proposed experiments in the field of neutrino astronomy are reviewed, with particular emphasis on expected sources and existing and proposed detectors for intermediate-energy (10 to 50 MeV) and ultrahigh energy (greater than 10 GeV) neutrinos. Following a brief discussion of the counting rate obtained in the solar neutrino experiment of Davis (1978) and possible statistical sources for the discrepancy between the expected and observed rates, consideration is given to the physics of neutrino ejection in stellar gravitational collapse and sources of high-energy proton collisions giving rise to ultrahigh energy neutrinos. The capabilities of operating Cerenkov detectors at the Homestake Gold Mine, the Mt. Blanc Tunnel and in the Soviet Caucasus are considered in relation to the detection of gravitational collapse in the center of the galaxy, and it is pointed out that neutrino detectors offer a more reliable means of detecting collapses in the Galaxy than do gravitational wave detectors. The possibility of using Cerenkov detectors for ultrahigh energy neutrino detection is also indicated, and applications of large neutrino detectors such as the proposed DUMAND array to measure the lifetime of the proton are discussed.

Schramm, D.N.

1980-01-01

50

Neutrino Telescopes  

SciTech Connect

Neutrino telescopes complement gamma ray telescopes in the observations of energetic astronomical sources as well as in searching for the dark matter. This paper gives the status of the current generation neutrino telescopes projects: Baikal, AMANDA, NESTOR, NEMO and ANTARES with particular emphasis on the ANTARES telescope in the Mediterranean Sea.

Carr, John [Centre de Physiques des Particules de Marseille, IN2P3/CNRS (France)

2005-02-21

51

Neutrino mass  

SciTech Connect

Neutrinos play a dominant role in both particle physics, astrophysics, and cosmology. In the our present understanding of the strong, weak, and electromagnetic forces, the group structure of the Standard Model is SU(3){sub C} {circle_times} SU(2){sub L} {circle_times} U(I){sub EM}. In the Weinberg-Salam-Glashow Standard Electroweak Model, left-handed neutrinos sit in a doublet, while right-handed neutrinos are in a singlet, and therefore do not interact with the other known particles. Also in this model, the neutrinos are intrinsically massless. However, while the W-S-G model provides an amazingly accurate picture of our present cold Universe, It has a number of deficits. The Standard Model does not explain the origin of the group structure, It does not reduce the number of coupling constants required, nor does it offer any prediction for the physical masses of the particles. Thus, it is generally assumed that the Standard Model is but a subset of some larger gauge theory. A wide variety of Grand Unified field Theories (GUTs), Super Symmetric Models (SUSY), and Superstring models have been proposed as the model for this larger structure. In general, these models predict nonzero neutrino masses and contain mechanisms that provide for lepton-number violation. Thus, a variety of new phenomena are predicted, including finite neutrino masses and the possibility that neutrinos can oscillate from one type to another. This report looks at the possibility of detecting neutrino vat mass.

Bowles, T.J.

1993-04-01

52

Neutrino mass  

SciTech Connect

Neutrinos play a dominant role in both particle physics, astrophysics, and cosmology. In the our present understanding of the strong, weak, and electromagnetic forces, the group structure of the Standard Model is SU(3)[sub C] [circle times] SU(2)[sub L] [circle times] U(I)[sub EM]. In the Weinberg-Salam-Glashow Standard Electroweak Model, left-handed neutrinos sit in a doublet, while right-handed neutrinos are in a singlet, and therefore do not interact with the other known particles. Also in this model, the neutrinos are intrinsically massless. However, while the W-S-G model provides an amazingly accurate picture of our present cold Universe, It has a number of deficits. The Standard Model does not explain the origin of the group structure, It does not reduce the number of coupling constants required, nor does it offer any prediction for the physical masses of the particles. Thus, it is generally assumed that the Standard Model is but a subset of some larger gauge theory. A wide variety of Grand Unified field Theories (GUTs), Super Symmetric Models (SUSY), and Superstring models have been proposed as the model for this larger structure. In general, these models predict nonzero neutrino masses and contain mechanisms that provide for lepton-number violation. Thus, a variety of new phenomena are predicted, including finite neutrino masses and the possibility that neutrinos can oscillate from one type to another. This report looks at the possibility of detecting neutrino vat mass.

Bowles, T.J.

1993-01-01

53

Unveiling neutrino mixing and leptonic CP violation  

SciTech Connect

We review the present understanding of neutrino masses and mixings, discussing what are the unknowns in the three family oscillation scenario. Despite the anticipated success coming from the planned long baseline neutrino experiments in unraveling the leptonic mixing sector, there are two important unknowns which may remain obscure: the mixing angle {theta}{sub 13} and the CP-phase {delta}. The measurement of these two parameters has led us to consider the combination of superbeams and neutrino factories as the key to unveil the neutrino oscillation picture.

Mena, Olga; /Fermilab

2005-01-01

54

Neutrino telescopes  

SciTech Connect

Neutrino astrophysics offers a new possibility to observe our Universe: high-energy neutrinos, produced by the most energetic phenomena in our Galaxy and in the Universe, carry complementary (if not exclusive) information about the cosmos: this young discipline extends in fact the conventional astronomy beyond the usual electromagnetic probe. The weak interaction of neutrinos with matter allows them to escape from the core of astrophysical objects and in this sense they represent a complementary messenger with respect to photons. However, their detection on Earth due to the small interaction cross section requires a large target mass. The aim of this article is to review the scientific motivations of the high-energy neutrino astrophysics, the detection principles together with the description of a running apparatus, the experiment ANTARES, the performance of this detector with some results, and the presentation of other neutrino telescope projects.

Costantini, H., E-mail: costant@cppm.in2p3.fr [CPPM, Aix-Marseille Universite, CNRS/IN2P3 (France)

2012-09-15

55

Fourth World Conference On Women  

NSDL National Science Digital Library

The Fourth World Conference On Women (4-15 September, Beijing, China) Web page offers general news, late breaking news, background information and more, updated daily. In French and English. Also available via gopher.

56

Discriminating Neutrino See-Saw Models  

E-print Network

We consider how well current theories can predict neutrino mass and mixing parameters, and construct a statistical discriminator which allows us to compare different models to each other. As an example we consider see-saw models based on family symmetry, and single right-handed neutrino dominance, and compare them to each other and to the case of neutrino anarchy with random entries in the neutrino Yukawa and Majorana mass matrices. The predictions depend crucially on the range of the undetermined coefficients over which we scan, and we speculate on how future theories might lead to more precise predictions for the coefficients and hence for neutrino observables. Our results indicate how accurately neutrino masses and mixing angles need to be measured by future experiments in order to discriminate between current models.

M. Hirsch; S. F. King

2001-02-08

57

Sterile Plus Active Neutrinos and Neutrino Oscillations  

NASA Astrophysics Data System (ADS)

Using a 3 + 1 neutrino model with one sterile and the three standard active neutrinos with a 4 × 4 unitary transformation matrix, U, relating flavor to mass neutrino states, the probability of ? ? to ? e transition is estimated using sterile-active neutrino masses determined by MiniBooNE and other experiments and sterile-active neutrino angles in the 4 × 4 U matrix.

Kisslinger, Leonard S.

2014-09-01

58

Multidimensional difference schemes with fourth-order accuracy  

NASA Technical Reports Server (NTRS)

An explicit finite-difference algorithm is presented for the solution of quasilinear divergence free multidimensional hyperbolic systems. The method consists of four steps per time level. The resulting scheme is fourth-order accurate in both space and time, though the intermediate steps are only first-order accurate. The family of schemes introduced is dissipative, and hence, suitable for both smooth flows and flows containing shocks. This method is compared, in several numerical examples, with both second-order schemes and others that are fourth order in space, but second order in time.

Turkel, E.; Abarbanel, S.; Gottlieb, D.

1976-01-01

59

Ultrahigh Energy Tau Neutrinos  

E-print Network

We study ultrahigh energy astrophysical neutrinos and the contribution of tau neutrinos from neutrino oscillations, relative to the contribution of the other flavors. We show the effect of tau neutrino regeneration and tau energy loss as they propagate through the Earth. We consider a variety of neutrino fluxes, such as cosmogenic neutrinos and neutrinos that originate in Active Galactic Nuclei. We discuss signals of tau neutrinos in detectors such as IceCube, RICE and ANITA.

J. Jones; I. Mocioiu; M. H. Reno; I Sarcevic

2005-07-30

60

Ultrahigh Energy Tau Neutrinos  

NASA Astrophysics Data System (ADS)

We study ultrahigh energy astrophysical neutrinos and the contribution of tau neutrinos from neutrino oscillations, relative to the contribution of the other flavors. We show the effect of tau neutrino regeneration and tau energy loss as they propagate through the Earth. We consider a variety of neutrino fluxes, such as cosmogenic neutrinos and neutrinos that originate in Active Galactic Nuclei. We discuss signals of tau neutrinos in detectors such as IceCube, RICE and ANITA.

Jones, J.; Mocioiu, I.; Sarcevic, I.; Reno, M. H.

61

Phenomenology of neutrino oscillations  

Microsoft Academic Search

This review is focused on neutrino mixing and neutrino oscillations in the light of the recent experimental developments. After discussing possible types of neutrino mixing for Dirac and Majorana neutrinos and considering in detail the phenomenology of neutrino oscillations in vacuum and matter, we review all existing evidence and indications in favour of neutrino oscillations that have been obtained in

W. Grimus; C. Giunti

1999-01-01

62

The ideal neutrino beams  

Microsoft Academic Search

The advance in neutrino oscillation physics is driven by the availability of well characterized and high flux neutrino beams. The three present options for the next generation neutrino oscillation facility are super beams, neutrino factories and beta-beams. A super-beam is a very high intensity classical neutrino beam generated by protons impinging on a target where the neutrinos are generated by

Mats Lindroos

2009-01-01

63

Neutrino oscillations in dense neutrino gases  

NASA Astrophysics Data System (ADS)

We consider oscillations of neutrinos under conditions in which the neutrino density is sufficiently large that neutrino-neutrino interactions cannot be neglected. A formalism is developed to treat this highly nonlinear system. Numerical analysis reveals a rich array of phenomena. In certain gases, a self-induced Mikheyev-Smirnov-Wolfenstein effect occurs in which electron neutrinos are resonantly converted into muon neutrinos. In another relatively low-density gas, an unexpected parametric resonant conversion takes place. Finally, neutrino-neutrino interactions maintain coherence in one system for which a priori one expected decoherence.

Samuel, Stuart

1993-08-01

64

First Neutrino Point-Source Results from the 22 String Icecube Detector  

Microsoft Academic Search

We present new results of searches for neutrino point sources in the northern sky, using data recorded in 2007-2008 with 22 strings of the IceCube detector (approximately one-fourth of the planned total) and 275.7 days of live time. The final sample of 5114 neutrino candidate events agrees well with the expected background of atmospheric muon neutrinos and a small component

R. Abbasi; Y. Abdou; M. Ackermann; J. Adams; J. Aguilar; K. Andeen; J. Auffenberg; X. Bai; M. Baker; S. W. Barwick; R. Bay; J. L. Bazo Alba; K. Beattie; J. J. Beatty; S. Bechet; J. K. Becker; K.-H. Becker; M. L. Benabderrahmane; J. Berdermann; P. Berghaus; D. Berley; E. Bernardini; D. Bertrand; D. Z. Besson; M. Bissok; E. Blaufuss; D. J. Boersma; C. Bohm; J. Bolmont; S. Böser; O. Botner; L. Bradley; J. Braun; D. Breder; T. Castermans; D. Chirkin; B. Christy; J. Clem; S. Cohen; D. F. Cowen; M. V. D'Agostino; M. Danninger; C. T. Day; C. De Clercq; L. Demirörs; O. Depaepe; F. Descamps; P. Desiati; G. de Vries-Uiterweerd; T. De Young; J. C. Diaz-Velez; J. Dreyer; J. P. Dumm; M. R. Duvoort; W. R. Edwards; R. Ehrlich; J. Eisch; R. W. Ellsworth; O. Engdegård; S. Euler; P. A. Evenson; O. Fadiran; A. R. Fazely; T. Feusels; K. Filimonov; C. Finley; M. M. Foerster; B. D. Fox; A. Franckowiak; R. Franke; T. K. Gaisser; J. Gallagher; R. Ganugapati; L. Gerhardt; L. Gladstone; A. Goldschmidt; J. A. Goodman; R. Gozzini; D. Grant; T. Griesel; A. Groß; S. Grullon; R. M. Gunasingha; M. Gurtner; C. Ha; A. Hallgren; F. Halzen; K. Han; K. Hanson; Y. Hasegawa; J. Heise; K. Helbing; P. Herquet; S. Hickford; G. C. Hill; K. D. Hoffman; K. Hoshina; D. Hubert; W. Huelsnitz; J.-P. Hülß; P. O. Hulth; K. Hultqvist; S. Hussain; R. L. Imlay; M. Inaba; A. Ishihara; J. Jacobsen; G. S. Japaridze; H. Johansson; J. M. Joseph; K.-H. Kampert; A. Kappes; T. Karg; A. Karle; J. L. Kelley; P. Kenny; J. Kiryluk; F. Kislat; S. R. Klein; S. Klepser; S. Knops; G. Kohnen; H. Kolanoski; L. Köpke; M. Kowalski; T. Kowarik; M. Krasberg; K. Kuehn; T. Kuwabara; M. Labare; S. Lafebre; K. Laihem; H. Landsman; R. Lauer; H. Leich; D. Lennarz; A. Lucke; J. Lundberg; J. Lünemann; J. Madsen; P. Majumdar; R. Maruyama; K. Mase; H. S. Matis; C. P. McParland; K. Meagher; M. Merck; P. Mészáros; E. Middell; N. Milke; H. Miyamoto; A. Mohr; T. Montaruli; R. Morse; S. M. Movit; K. Münich; R. Nahnhauer; J. W. Nam; P. Nießen; D. R. Nygren; S. Odrowski; A. Olivas; M. Olivo; M. Ono; S. Panknin; S. Patton; C. Pérez de los Heros; J. Petrovic; A. Piegsa; D. Pieloth; A. C. Pohl; R. Porrata; N. Potthoff; P. B. Price; M. Prikockis; G. T. Przybylski; K. Rawlins; P. Redl; E. Resconi; W. Rhode; M. Ribordy; A. Rizzo; J. P. Rodrigues; P. Roth; F. Rothmaier; C. Rott; C. Roucelle; D. Rutledge; D. Ryckbosch; H.-G. Sander; S. Sarkar; K. Satalecka; S. Schlenstedt; T. Schmidt; D. Schneider; A. Schukraft; O. Schulz; M. Schunck; D. Seckel; B. Semburg; S. H. Seo; Y. Sestayo; S. Seunarine; A. Silvestri; A. Slipak; G. M. Spiczak; C. Spiering; M. Stamatikos; T. Stanev; G. Stephens; T. Stezelberger; R. G. Stokstad; M. C. Stoufer; S. Stoyanov; E. A. Strahler; T. Straszheim; K.-H. Sulanke; G. W. Sullivan; Q. Swillens; I. Taboada; O. Tarasova; A. Tepe; S. Ter-Antonyan; C. Terranova; S. Tilav; M. Tluczykont; P. A. Toale; D. Tosi; D. Turcan; N. van Eijndhoven; J. Vandenbroucke; A. Van Overloop; B. Voigt; C. Walck; T. Waldenmaier; M. Walter; C. Wendt; S. Westerhoff; N. Whitehorn; C. H. Wiebusch; A. Wiedemann; G. Wikström; D. R. Williams; R. Wischnewski; H. Wissing; K. Woschnagg; X. W. Xu; G. Yodh

2009-01-01

65

Neutrino Mixing and Neutrino Telescopes  

E-print Network

Measuring flux ratios of ultra-high energy neutrinos is an alternative method to determine the neutrino mixing angles and the CP phase delta. We conduct a systematic analysis of the neutrino mixing probabilities and of various flux ratios measurable at neutrino telescopes. The considered cases are neutrinos from pion, neutron and muon-damped sources. Explicit formulae in case of mu-tau symmetry and its special case tri-bimaximal mixing are obtained, and the leading corrections due to non-zero theta_{13} and non-maximal theta_{23} are given. The first order correction is universal as it appears in basically all ratios. We study in detail its dependence on theta_{13}, theta_{23} and the CP phase, finding that the dependence on theta_{23} is strongest. The flavor compositions for the considered neutrino sources are evaluated in terms of this correction. A measurement of a flux ratio is a clean measurement of the universal correction (and therefore of theta_{13}, theta_{23} and delta) if the zeroth order ratio does not depend on theta_{12}. This favors pion sources over the other cases, which in turn are good candidates to probe theta_{12}. The only situations in which the universal correction does not appear are certain ratios in case of a neutron and muon-damped source, which depend mainly on theta_{12} and receive only quadratic corrections from the other parameters. We further show that there are only two independent neutrino oscillation probabilities, give the allowed ranges of the considered flux ratios and of all probabilities, and show that none of the latter can be zero or one.

Werner Rodejohann

2007-01-03

66

Solar Neutrinos and the Decaying Neutrino Hypothesis  

E-print Network

We explore, mostly using data from solar neutrino experiments, the hypothesis that the neutrino mass eigenstates are unstable. We find that, by combining $^8$B solar neutrino data with those on $^7$Be and lower-energy solar neutrinos, one obtains a mostly model-independent bound on both the $\

Jeffrey M. Berryman; Andre de Gouvea; Daniel Hernandez

2014-11-02

67

Neutrino Oscillations and the Sudbury Neutrino Observatory  

NASA Astrophysics Data System (ADS)

When the existence of the neutrino was almost apologetically first proposed by Wolfgang Pauli it was intended to explain the mysterious apparent absence of energy and momentum in beta decay. 70 years later the neutrino has indeed solved that mystery, but it has generated still more of its own. Are neutrinos massive? Is it possible to create a neutrino with its spin in the same direction as its momentum? What fraction of the mass of the Universe is made up of neutrinos? Are the flavour labels which we put on neutrinos, like electron and muon, really fixed or can they change? Why does no experiment see the predicted flux of neutrinos from the Sun? Why do there appear to be roughly equal numbers of muon and electron neutrinos created in our atmosphere, rather than the 2:1 ratio we would expect? Many of these questions were coupled when Bruno Pontecorvo first suggested that the shortfall in solar neutrino measurements were caused by neutrino oscillations - neutrinos spontaneously changing flavour as they travel from the Sun. 30 years later we still await definitive proof of that conjecture, and providing that proof is the reason for the Sudbury Neutrino Observatory. The talk will discuss the current state of neutrino oscillations studies, and show how the unique capabilities of the Sudbury Neutrino Observatory can provide definitive proof of whether neutrino oscillations are the long-sought answer to the solar neutrino problem.

Wark, David

2001-04-01

68

Solar Neutrinos  

E-print Network

Experimental work with solar neutrinos has illuminated the properties of neutrinos and tested models of how the sun produces its energy. Three experiments continue to take data, and at least seven are in various stages of planning or construction. In this review, the current experimental status is summarized, and future directions explored with a focus on the effects of a non-zero theta-13 and the interesting possibility of directly testing the luminosity constraint. Such a confrontation at the few-percent level would provide a prediction of the solar irradiance tens of thousands of years in the future for comparison with the present-day irradiance. A model-independent analysis of existing low-energy data shows good agreement between the neutrino and electromagnetic luminosities at the +/- 20 % level.

R. G. H. Robertson

2006-02-05

69

Neutrino masses, neutrino oscillations, and cosmological implications  

NASA Technical Reports Server (NTRS)

Theoretical concepts and motivations for considering neutrinos having finite masses are discussed and the experimental situation on searches for neutrino masses and oscillations is summarized. The solar neutrino problem, reactor, deep mine and accelerator data, tri decay experiments and double beta-decay data are considered and cosmological implications and astrophysical data relating to neutrino masses are reviewed. The neutrino oscillation solution to the solar neutrino problem, the missing mass problem in galaxy halos and galaxy cluster galaxy formation and clustering, and radiative neutrino decay and the cosmic ultraviolet background radiation are examined.

Stecker, F. W.

1982-01-01

70

Neutrino masses, neutrino oscillations, and cosmological implications  

SciTech Connect

Theoretical concepts and motivations for considering neutrinos having finite masses are discussed and the experimental situation on searches for neutrino masses and oscillations is summarized. The solar neutrino problem, reactor, deep mine and accelerator data, tri-decay experiments and double beta-decay data are considered and cosmological implications and astrophysical data relating to neutrino masses are reviewed. The neutrino oscillation solution to the solar neutrino problem, the missing mass problem in galaxy halos and galaxy cluster galaxy formation and clustering, and radiative neutrino decay and the cosmic ultraviolet background radiation are examined.

Stecker, F.W.

1982-03-01

71

Light sterile neutrinos in particle physics: Experimental status  

NASA Astrophysics Data System (ADS)

Most of the neutrino oscillation results can be explained by the three-neutrino paradigm. However several anomalies in short baseline oscillation data, corresponding to an L/E of about 1 m/MeV, could be interpreted by invoking a hypothetical fourth neutrino. This new state would be separated from the three standard neutrinos by a squared mass difference ?mnew2 ? 0.1 - 1eV2 and would have mixing angles of sin2 2?ee ? 0.01 and sin2 2??e ? 0.001, in the electron disappearance and appearance channels, respectively. This new neutrino, often called sterile, would not feel standard model interactions but mix with the others. Such a scenario calling for new physics beyond the standard model has to be either ruled out or confirmed with new data. After a brief review of the anomalous oscillation results we discuss the forthcoming laboratory experiments aiming to clarify the situation.

Lasserre, Thierry

2014-09-01

72

Neutrinos and Symmetries  

E-print Network

Three facets of symmetries in neutrino physics are briefly reviewed: i) The SO(5) symmetry of the neutrino mass and and its connection to the see-saw mechanism; ii) Flavor SU(N) symmetries of dense, self-interacting neutrino gases in astrophysical settings; iii) The neutrino mixing angle theta13 and possible CP-violation in the neutrino sector.

A. B. Balantekin

2009-10-09

73

Decaying Dirac neutrinos  

Microsoft Academic Search

Constraints on Dirac-neutrino decay into invisible particles are surveyed. Neutrino lifetimes short enough to explain the solar-neutrino problem are allowed by present terrestrial and cosmological measurements. A model in which Dirac neutrinos can have such short lifetimes is proposed. The recently resurrected 17-keV neutrino is incorporated into this model.

A. Acker; S. Pakvasa; J. Pantaleone

1992-01-01

74

Fourth-generation storage rings  

SciTech Connect

It seems clear that a linac-driven free-electron laser is the accepted prototype of a fourth-generation facility. This raises two questions: can a storage ring-based light source join the fourth generation? Has the storage ring evolved to its highest level of performance as a synchrotrons light source? The answer to the second question is clearly no. The author thinks the answer to the first question is unimportant. While the concept of generations has been useful in motivating thought and effort towards new light source concepts, the variety of light sources and their performance characteristics can no longer be usefully summed up by assignment of a ''generation'' number.

Galayda, J. N.

1999-11-16

75

Fourth Aircraft Interior Noise Workshop  

NASA Technical Reports Server (NTRS)

The fourth in a series of NASA/SAE Interior Noise Workshops was held on May 19 and 20, 1992. The theme of the workshop was new technology and applications for aircraft noise with emphasis on source noise prediction; cabin noise prediction; cabin noise control, including active and passive methods; and cabin interior noise procedures. This report is a compilation of the presentations made at the meeting which addressed the above issues.

Stephens, David G. (compiler)

1992-01-01

76

Solar Neutrinos  

E-print Network

The status of the solar neutrino problem is reviewed. Attempts to explain the observed deficit and spectral distortion, both by astrophysical and particle physics methods, are described. It is argued that the comparison of all experiments strongly prefers the particle physics solutions.

Paul Langacker

1994-11-19

77

Electromagnetic properties of neutrinos  

E-print Network

A short review on electromagnetic properties of neutrinos is presented. In spite of many efforts in the theoretical and experimental studies of neutrino electromagnetic properties, they still remain one of the main puzzles related to neutrinos.

Carlo Giunti; Alexander Studenikin

2010-06-08

78

NEUTRINO FACTORIES - PHYSICS POTENTIALS.  

SciTech Connect

The recent results from Super-Kamiokande atmospheric and solar neutrino observations opens a new era in neutrino physics and has sparked a considerable interest in the physics possibilities with a Neutrino Factory based on the muon storage ring. We present physics opportunities at a Neutrino Factory, and prospects of Neutrino oscillation experiments. Using the precisely known flavor composition of the beam, one could envision an extensive program to measure the neutrino oscillation mixing matrix, including possible CP violating effects. These and Neutrino Interaction Rates for examples of a Neutrino Factory at BNL (and FNAL) with detectors at Gran Sasso, SLAC and Sudan are also presented.

PARSA,Z.

2001-02-16

79

Implications of ultra-high energy neutrino flux constraints for Lorentz-invariance violating cosmogenic neutrinos  

E-print Network

We consider the implications of Lorentz-invariance violation (LIV) on cosmogenic neutrino observations, with particular focus on the constraints imposed on several well-developed models for ultra-high energy cosmogenic neutrino production by recent results from the Antarctic Impulsive Transient Antenna (ANITA) long-duration balloon payload, and Radio Ice Cherenkov Experiment (RICE) at the South Pole. Under a scenario proposed originally by Coleman and Glashow, each lepton family may attain maximum velocities that can exceed the speed of light, leading to energy-loss through several interaction channels during propagation. We show that future observations of cosmogenic neutrinos will provide by far the most stringent limit on LIV in the neutrino sector. We derive the implied level of LIV required to suppress observation of predicted fluxes from several mainstream cosmogenic neutrino models, and specifically those recently constrained by the ANITA and RICE experiments. We simulate via detailed Monte Carlo code ...

Gorham, P W; Allison, P; Beatty, J J; Belov, K; Besson, D Z; Binns, W R; Chen, P; Clem, J M; Hoover, S; Israel, M H; Nam, J; Saltzberg, D; Varner, G S; Vieregg, A G

2012-01-01

80

Solar neutrino experiments and neutrino oscillations  

SciTech Connect

This report gives the results of the Brookhaven solar neutrino experiment that is based upon the neutrino capture reaction, /sup 37/Cl(..nu..,e/sup -/)/sup 37/Ar. The experiment was built in 1967 to test the theory of solar energy production, and it is well known that the neutrino capture rate in the detector is lower than that expected from theoretical models of the sun. The results will be compared to the current solar model calculations. One possible explanation of the low solar neutrino capture rate is that the neutrinos oscillate between two or more neutrino states, a topic of particular interest to this conference. This question is discussed in relation to the /sup 37/Cl experiment, and to other solar neutrino detectors that are capable of observing the lower energy neutrinos from the sun. A radiochemical solar neutrino detector located deep underground has a very low background and is capable of detecting the monoenergetic neutrinos from megacurie sources of radioisotopes that decay by electron capture. Experiments of this nature are described that are capable of testing for neutrino oscillations with a omicronm/sup 2/ as low as 0.2 eV/sup 2/ if there is maximum mixing between two neutrino states.

Cleveland, B.T.; Davis, R. Jr.; Rowley, J.K.

1981-01-01

81

The history of neutrinos, 1930-1985. What have we learned about neutrinos? What have we learned using neutrinos?  

SciTech Connect

An attempt to remember some of the main events which highlight the evolution of our knowledge of the neutrinos and their properties, the 'families' of particles, a few of the very interesting persons who contributed to this progress, as well as the contribution of neutrino beam experiments to the validation of the electro-weak and quantum-chromo-dynamic theories, and the structure of the nucleon. - Highlights: Black-Right-Pointing-Pointer Early history: continuity of {beta}-spectrum, Pauli letter, universal Fermi interaction. Black-Right-Pointing-Pointer Neutrino beams and the discovery of the muon neutrino. Black-Right-Pointing-Pointer Gargamelle, the discovery of the neutral current and the verification of the quark-gluon nature of the parton. Black-Right-Pointing-Pointer Deep inelastic scattering at higher energies: scaling, quantitative verification of QCD, structure functions.

Steinberger, J., E-mail: jack.steinberger@cern.ch

2012-12-15

82

Muons and Neutrinos 2007  

E-print Network

This paper is the written version of the rapporteur talk on Section HE-2, muons and neutrinos, presented at the 30th International Cosmic Ray Conference, Merida, Yucatan, July 11, 2007. Topics include atmospheric muons and neutrinos, solar neutrinos and astrophysical neutrinos as well as calculations and instrumentation related to these topics.

Thomas K. Gaisser

2008-01-29

83

Whatâs a Neutrino?  

NSDL National Science Digital Library

This website contains an introduction to neutrinos, one of the fundamental particles that make up the universe. A description of neutrinos and their properties is provided. The site also includes a chronology of neutrinos studies and discoveries, frequently asked questions, and links to more information about neutrinos.

2006-11-30

84

New Neutrinos Algal Biofuels  

E-print Network

New Neutrinos Algal Biofuels Charged-Particle Vision Primordial Soup LOS ALAMOS SCIENCE in Illinois, a beam of neutrino particles streams through the MiniBooNE detector. This experiment tests the degree to which neutrinos shift from one "flavor" to another. Each neutrino normally travels as a mixture

85

Neutrino oscillations in matter  

Microsoft Academic Search

The effect of coherent forward scattering must be taken into account when considering the oscillations of neutrinos traveling through matter. In particular, for the case of massless neutrinos for which vacuum oscillations cannot occur, oscillations can occur in matter if the neutral current has an off-diagonal piece connecting different neutrino types. Applications discussed are solar neutrinos and a proposed experiment

L. Wolfenstein

1978-01-01

86

Underground neutrino astronomy  

SciTech Connect

A review is made of possible astronomical neutrino sources detectable with underground facilities. Comments are made about solar neutrinos and gravitational-collapse neutrinos, and particular emphasis is placed on ultra-high-energy astronomical neutrino sources. An appendix mentions the exotic possibility of monopolonium.

Schramm, D.N.

1983-02-01

87

Narrative Approaches to Therapy: The "Fourth Wave" in Family Therapy.  

ERIC Educational Resources Information Center

Postmodern developments in counseling and therapy have led to the emergence of the use of the narrative metaphor in therapeutic practice. Investigates the evolution of narrative approaches in counseling and therapy and explores the philosophical, theoretical, and practical assumptions of this relatively untested application. Some of its unique…

Monk, Gerald

1996-01-01

88

Neutrinos in Nuclear Physics  

E-print Network

Since the discovery of nuclear beta decay, nuclear physicists have studied the weak interaction and the nature of neutrinos. Many recent and current experiments have been focused on the elucidation of neutrino oscillations and neutrino mass. The quest for the absolute value of neutrino mass continues with higher precision studies of the tritium beta decay spectrum near the endpoint. Neutrino oscillations are studied through measurements of reactor neutrinos as a function of baseline and energy. And experiments searching for neutrinoless double beta decay seek to discover violation of lepton number and establish the Majorana nature of neutrino masses.

R. D. McKeown

2014-12-03

89

The cosmic neutrino background  

NASA Technical Reports Server (NTRS)

The cosmic neutrino background is expected to consist of relic neutrinos from the big bang, of neutrinos produced during nuclear burning in stars, of neutrinos released by gravitational stellar collapse, and of neutrinos produced by cosmic ray interactions with matter and radiation in the interstellar and intergalactic medium. Formation of baryonic dark matter in the early universe, matter-antimatter annihilation in a baryonic symmetric universe, and dark matter annihilation could have also contributed significantly to the cosmic neutrino background. The purpose of this paper is to review the properties of these cosmic neutrino backgrounds, the indirect evidence for their existence, and the prospects for their detection.

Dar, Arnon

1991-01-01

90

Implications of ultrahigh energy neutrino flux constraints for Lorentz-invariance violating cosmogenic neutrinos  

NASA Astrophysics Data System (ADS)

We consider the implications of Lorentz-invariance violation (LIV) on cosmogenic neutrino observations, with particular focus on the constraints imposed on several well-developed models for ultrahigh energy cosmogenic neutrino production by recent results from the ANITA long-duration balloon payload, and RICE at the South Pole. Under a scenario proposed originally by Coleman and Glashow, each lepton family may attain maximum velocities that can exceed c, leading to energy-loss through several interaction channels during propagation. We show that future observations of cosmogenic neutrinos will provide by far the most stringent limit on LIV in the neutrino sector. We derive the implied level of LIV required to suppress observation of predicted fluxes from several mainstream cosmogenic neutrino models, and specifically those recently constrained by the ANITA and RICE experiments. We simulate via detailed Monte Carlo code the propagation of cosmogenic neutrino fluxes in the presence of LIV-induced energy losses. We show that this process produces several detectable effects in the resulting attenuated neutrino spectra, even at LIV-induced neutrino superluminality of (u?-c)/c?10-26, about 13 orders of magnitude below current bounds.

Gorham, P. W.; Connolly, A.; Allison, P.; Beatty, J. J.; Belov, K.; Besson, D. Z.; Binns, W. R.; Chen, P.; Clem, J. M.; Hoover, S.; Israel, M. H.; Nam, J.; Saltzberg, D.; Varner, G. S.; Vieregg, A. G.

2012-11-01

91

Cosmic neutrino cascades from secret neutrino interactions  

NASA Astrophysics Data System (ADS)

The first detection of high-energy astrophysical neutrinos by IceCube provides new opportunities for tests of neutrino properties. The long baseline through the cosmic neutrino background (C?B) is particularly useful for directly testing secret neutrino interactions (?SI) that would cause neutrino-neutrino elastic scattering at a larger rate than the usual weak interactions. We show that IceCube can provide competitive sensitivity to ?SI compared to other astrophysical and cosmological probes, which are complementary to laboratory tests. We study the spectral distortions caused by ?SI with a large s-channel contribution, which can lead to a dip, bump, or cutoff on an initially smooth spectrum. Consequently, ?SI may be an exotic solution for features seen in the IceCube energy spectrum. More conservatively, IceCube neutrino data could be used to set model-independent limits on ?SI. Our phenomenological estimates provide guidance for more detailed calculations, comparisons to data, and model building.

Ng, Kenny C. Y.; Beacom, John F.

2014-09-01

92

Relic neutrino absorption spectroscopy  

NASA Astrophysics Data System (ADS)

Resonant annihilation of extremely high-energy cosmic neutrinos on big-bang relic anti-neutrinos (and vice versa) into Z bosons leads to sizable absorption dips in the neutrino flux to be observed at Earth. The high-energy edges of these dips are fixed, via the resonance energies, by the neutrino masses alone. Their depths are determined by the cosmic neutrino background density, by the cosmological parameters determining the expansion rate of the Universe, and by the large redshift history of the cosmic neutrino sources. We investigate the possibility of determining the existence of the cosmic neutrino background within the next decade from a measurement of these absorption dips in the neutrino flux. As a by-product, we study the prospects to infer the absolute neutrino mass scale. We find that, with the presently planned neutrino detectors (ANITA, Auger, EUSO, OWL, RICE, and SalSA) operating in the relevant energy regime above 1021 eV, relic neutrino absorption spectroscopy becomes a realistic possibility. It requires, however, the existence of extremely powerful neutrino sources, which should be opaque to nucleons and high-energy photons to evade present constraints. Furthermore, the neutrino mass spectrum must be quasidegenerate to optimize the dip, which implies m??0.1 eV for the lightest neutrino. With a second generation of neutrino detectors, these demanding requirements can be relaxed considerably.

Eberle, Birgit; Ringwald, Andreas; Song, Liguo; Weiler, Thomas J.

2004-07-01

93

The Neutrino and the SNP  

NSDL National Science Digital Library

This site from the Sudbury Neutrino Observatory provides an explanation of neutrinos and of the former discrepancy between theoretical models and solar neutrino data known as the Solar Neutrino Problem (SNP). The site contains a brief history of the study of neutrinos, a graph of the solar neutrinos spectrum, and a discussion of their flux. The role of the Sudbury Neutrino Observatory in collecting neutrinos data is also presented.

2006-12-03

94

Osteoblastic meningioma of the fourth ventricle.  

PubMed

Meningiomas of the fourth ventricle are rare neoplasms. Only meningothelial and fibroblastic subtypes, purportedly arising from the tela choroidea, have been described. In this report we describe clinical, neuroradiological and pathological findings in a 52-year-old man with mild hydrocephalus produced by a large, calcified, osteoblastic meningioma of the fourth ventricle. PMID:2710303

Johnson, M D; Tulipan, N; Whetsell, W O

1989-04-01

95

Fourth Grade Level Science Sample Curriculum.  

ERIC Educational Resources Information Center

This document presents a sample of the Arkansas science curriculum and identifies the content standards for physical science systems, life science systems, and Earth science/space science systems for fourth grade students. Each content standard is explained and includes student learning expectations, fourth grade benchmarks, assessments, and…

Arkansas State Dept. of Education, Little Rock.

96

Solar Neutrinos: History  

NSDL National Science Digital Library

This site, authored by John Bahcall of the School of Natural Sciences, offers several articles about neutrinos, the neutrino oscillations, and the sun. The page is structured in this fashion: a historical overview of solar models, a theoretical description of solar neutrinos, an experimental description of solar neutrinos, an explanation of how the sun shines, and the evolution of neutrino astronomy. The page links users to pdfs of useful papers concerning these topics. This is a useful resource for those looking for a comprehensive history of solar neutrinos.

Bahcall, John

2009-04-15

97

Neutrino Nucleosynthesis in Supernovae  

SciTech Connect

Neutrino nucleosynthesis is an important synthesis process for light elements in supernovae. One important physics input of neutrino nucleosynthesis is cross sections of neutrino-nucleus reactions. The cross sections of neutrino-{sup 12}C and {sup 4}He reactions are derived using new shell model Hamiltonians. With the new cross sections, light element synthesis of a supernova is investigated. The appropriate range of the neutrino temperature for supernovae is constrained to be between 4.3 MeV and 6.5 MeV from the {sup 11}B abundance in Galactic chemical evolution. Effects by neutrino oscillations are also discussed.

Yoshida, Takashi [Division of Theoretical Astronomy, National Astronomical Observatory of Japan (Japan); Suzuki, Toshio [Department of Physics, College of Humanities and Sciences, Nihon University (Japan); Chiba, Satoshi [Advanced Science Research Center, Japan Atomic Energy Agency (Japan); Kajino, Toshitaka [Division of Theoretical Astronomy, National Astronomical Observatory of Japan (Japan); Department of Astronomy, Graduate School of Science, University of Tokyo (Japan); Yokomakura, Hidekazu; Kimura, Keiichi [Department of Physics, Graduate School of Science, Nagoya University (Japan); Takamura, Akira [Department of Mathematics, Toyota National College of Technology (Japan); Hartmann, Dieter H. [Department of Physics and Astronomy, Clemson University (United States)

2009-05-04

98

Fourth order spatial derivative gravity  

SciTech Connect

In this work, we study a modified theory of gravity that contains up to fourth order spatial derivatives as a model for the Horava-Lifshitz gravity. The propagator is evaluated and, as a result, one extra pole is obtained, corresponding to a spin-2 nonrelativistic massless particle, an extra term which jeopardizes renormalizability, besides the unexpected general relativity unmodified propagator. Then unitarity is proved at the tree level, where the general relativity pole has been shown to have no dynamics, remaining only the 2 degrees of freedom of the new pole. Next, the nonrelativistic effective potential is determined from a scattering process of two identical massive gravitationally interacting bosons. In this limit, Newton's potential is obtained, together with a Darwin-like term that comes from the extra nonpole term in the propagator. Regarding renormalizability, this extra term may be harmful by power counting, but it can be eliminated by adjusting the free parameters of the model. This adjustment is in accord with the detailed balance condition suggested in the literature and shows that the way in which extra spatial derivative terms are added is of fundamental importance.

Bemfica, F. S.; Gomes, M. [Instituto de Fisica, Universidade de Sao Paulo Caixa Postal 66318, 05315-970, Sao Paulo, SP (Brazil)

2011-10-15

99

Relic neutrinos: neutrino properties from cosmology  

E-print Network

After a short introduction on the predicted cosmic neutrino background in the universe, we review some of the cosmological bounds related to neutrinos. In particular we show how the recent data on the anisotropies of the cosmic microwave background radiation from the WMAP satellite, combined with other experimental results, can constrain the radiation content of the universal energy density and the sum of neutrino masses.

Sergio Pastor

2003-06-24

100

Astroparticle physics with solar neutrinos  

PubMed Central

Solar neutrino experiments observed fluxes smaller than the expectations from the standard solar model. This discrepancy is known as the “solar neutrino problem”. Flux measurements by Super-Kamiokande and SNO have demonstrated that the solar neutrino problem is due to neutrino oscillations. Combining the results of all solar neutrino experiments, parameters for solar neutrino oscillations are obtained. Correcting for the effect of neutrino oscillations, the observed neutrino fluxes are consistent with the prediction from the standard solar model. In this article, results of solar neutrino experiments are reviewed with detailed descriptions of what Kamiokande and Super-Kamiokande have contributed to the history of astroparticle physics with solar neutrino measurements. PMID:21558758

NAKAHATA, Masayuki

2011-01-01

101

Neutrino mixing scenarios and AGN  

E-print Network

Active galactic nuclei (AGN) have been suggested to be sources of very high energy neutrinos. We consider the possibility of using AGN neutrinos to test neutrino mixings. From the atmospheric, solar and laboratory data on neutrino oscillations we derive the flavour composition of the AGN neutrino flux in different neutrino mixing schemes. We show that most of the schemes considered can be distinguished from each other and the existence of a sterile neutrino can be specially tested. AGN neutrinos can also be used to test those four-neutrino scenarios where solar neutrinos oscillate into an arbitrary mixture of $\

Luis Bento; Petteri Keränen; Jukka Maalampi

2000-02-01

102

The Neutrino Underground  

NSF Publications Database

... the facility that produces the neutrino beam at the Fermi National Accelerator Laboratory in Batavia ... detector at Fermilab, will monitor the neutrino beam as it heads outward. The other, the 6,000-ton ...

103

The Fourth Annual Report of the Wisconsin Poverty Project Wisconsin Poverty Report  

E-print Network

The Fourth Annual Report of the Wisconsin Poverty Project Wisconsin Poverty Report: How the Safety Net Protected Families from Poverty in 2010 Yiyoon Chung, Julia B. Isaacs, Timothy M. Smeeding, and Katherine A. Thornton Institute for Research on Poverty University of Wisconsin­Madison April 2012 #12;ABOUT

Sheridan, Jennifer

104

Youth at Risk: A Prevention Resource for Counselors, Teachers, and Parents. Fourth Edition.  

ERIC Educational Resources Information Center

The fourth revision of this text offers both tested prevention strategies for work with diverse at-risk populations and counseling techniques that address the complexities of destructive behavior from individual, family, school, and community perspectives. Drawing on the wisdom of 24 experts, this book provides concrete advice for creating and…

Capuzzi, David, Ed.; Gross, Douglas R., Ed.

105

Family Policies and Children's School Achievement in Single- versus Two-Parent Families.  

ERIC Educational Resources Information Center

Investigates the gap in math and science achievement of third- and fourth-graders who live with a single parent versus those who live with two parents in 11 countries. Finds single parenthood to be less detrimental when family policies equalize resources between single- and two-parent families. Concludes that national family policies can offset…

Pong, Suet-Ling; Dronkers, Jaap; Hampden-Thompson, Gillian

2003-01-01

106

Neutrino Oscillation Physics  

SciTech Connect

To complement the neutrino-physics lectures given at the 2011 International School on Astro Particle Physics devoted to Neutrino Physics and Astrophysics (ISAPP 2011; Varenna, Italy), at the 2011 European School of High Energy Physics (ESHEP 2011; Cheila Gradistei, Romania), and, in modified form, at other summer schools, we present here a written description of the physics of neutrino oscillation. This description is centered on a new way of deriving the oscillation probability. We also provide a brief guide to references relevant to topics other than neutrino oscillation that were covered in the lectures. Neutrinos and photons are by far the most abundant elementary particles in the universe. Thus, if we would like to comprehend the universe, we must understand the neutrinos. Of course, studying the neutrinos is challenging, since the only known forces through which these electrically-neutral leptons interact are the weak force and gravity. Consequently, interactions of neutrinos in a detector are very rare events, so that very large detectors and intense neutrino sources are needed to make experiments feasible. Nevertheless, we have confirmed that the weak interactions of neutrinos are correctly described by the Standard Model (SM) of elementary particle physics. Moreover, in the last 14 years, we have discovered that neutrinos have nonzero masses, and that leptons mix. These discoveries have been based on the observation that neutrinos can change from one 'flavor' to another - the phenomenon known as neutrino oscillation. We shall explain the physics of neutrino oscillation, deriving the probability of oscillation in a new way. We shall also provide a very brief guide to references that can be used to study some major neutrino-physics topics other than neutrino oscillation.

Kayser, Boris

2012-06-01

107

Geo-neutrino Observation  

SciTech Connect

Observations of geo-neutrinos measure radiogenic heat production within the earth, providing information on the thermal history and dynamic processes of the mantle. Two detectors currently observe geo-neutrinos from underground locations. Other detection projects in various stages of development include a deep ocean observatory. This paper presents the current status of geo-neutrino observation and describes the scientific capabilities of the deep ocean observatory, with emphasis on geology and neutrino physics.

Dye, S. T. [University of Hawaii at Manoa, Honolulu, Hawaii 96822 (United States); Hawaii Pacific University, Kaneohe, Hawaii 96744 (United States); Alderman, M.; Batygov, M.; Learned, J. G.; Matsuno, S.; Mahoney, J. M.; Pakvasa, S.; Rosen, M.; Smith, S.; Varner, G. [University of Hawaii at Manoa, Honolulu, Hawaii 96822 (United States); McDonough, W. F. [University of Maryland, College Park, Maryland 20742 (United States)

2009-12-17

108

The Sudbury Neutrino Observatory  

Microsoft Academic Search

The Sudbury Neutrino Observatory is a second-generation water Cherenkov detector designed to determine whether the currently observed solar neutrino deficit is a result of neutrino oscillations. The detector is unique in its use of D2O as a detection medium, permitting it to make a solar model-independent test of the neutrino oscillation hypothesis by comparison of the charged- and neutral-current interaction

J Boger; R. L Hahn; J. K Rowley; A. L Carter; B Hollebone; D Kessler; I Blevis; F Dalnoki-Veress; A DeKok; J Farine; D. R Grant; C. K Hargrove; G Laberge; I Levine; K McFarlane; H Mes; A. T Noble; V. M Novikov; M O'Neill; M Shatkay; C Shewchuk; D Sinclair; E. T. H Clifford; R Deal; E. D Earle; E Gaudette; G Milton; B Sur; J Bigu; J. H. M Cowan; D. L Cluff; E. D Hallman; R. U Haq; J Hewett; J. G Hykawy; G Jonkmans; R Michaud; A Roberge; J Roberts; E Saettler; M. H Schwendener; H Seifert; D Sweezey; R Tafirout; C. J Virtue; D. N Beck; Y. D Chan; X Chen; M. R Dragowsky; F. W Dycus; J Gonzalez; M. C. P Isaac; Y Kajiyama; G. W Koehler; K. T Lesko; M. C Moebus; E. B Norman; C. E Okada; A. W. P Poon; P Purgalis; A Schuelke; A. R Smith; R. G Stokstad; S Turner; I Zlimen; J. M Anaya; T. J Bowles; S. J Brice; Ernst-Ingo Esch; M. M Fowler; Azriel Goldschmidt; A Hime; A. F McGirt; G. G Miller; W. A Teasdale; J. B Wilhelmy; J. M Wouters; J. D Anglin; M Bercovitch; W. F Davidson; R. S Storey; S Biller; R. A Black; R. J Boardman; M. G Bowler; J Cameron; B Cleveland; A. P Ferraris; G Doucas; H Heron; C Howard; N. A Jelley; A. B Knox; M Lay; W Locke; J Lyon; S Majerus; M Moorhead; M Omori; N. W Tanner; R. K Taplin; M Thorman; D. L Wark; J. C Barton; P. T Trent; R Kouzes; M. M Lowry; A. L Bell; E Bonvin; M Boulay; M Dayon; F Duncan; L. S Erhardt; H. C Evans; G. T Ewan; R Ford; A Hallin; A Hamer; P. M Hart; P. J Harvey; D Haslip; C. A. W Hearns; R Heaton; J. D Hepburn; C. J Jillings; E. P Korpach; H. W Lee; J. R Leslie; M.-Q Liu; H. B Mak; A. B McDonald; J. D MacArthur; W McLatchie; B. A Moffat; S Noel; T. J Radcliffe; B. C Robertson; P Skensved; R. L Stevenson; X Zhu; S Gil; J Heise; R. L Helmer; R. J Komar; C. W Nally; H. S Ng; C. E Waltham; R. C Allen; G Bühler; H. H Chen; G Aardsma; T Andersen; K Cameron; M. C Chon; R. H Hanson; P Jagam; J Karn; J Law; R. W Ollerhead; J. J Simpson; N Tagg; J.-X Wang; C Alexander; E. W Beier; J. C Cook; D. F Cowen; E. D Frank; W Frati; P. T Keener; J. R Klein; G Mayers; D. S McDonald; M. S Neubauer; F. M Newcomer; R. J Pearce; R. G. Van de Water; R. Van Berg; P Wittich; Q. R Ahmad; J. M Beck; M. C Browne; T. H Burritt; P. J Doe; C. A Duba; S. R Elliott; J. E Franklin; J. V Germani; P Green; A. A Hamian; K. M Heeger; M Howe; R. Meijer Drees; A Myers; R. G. H Robertson; M. W. E Smith; T. D Steiger; T. Van Wechel; J. F Wilkerson

2000-01-01

109

Atmospheric Neutrinos in SNO  

NASA Astrophysics Data System (ADS)

The Sudbury Neutrino Observatory (SNO) was designed primarily to detect solar neutrinos. Its detection of atmospheric neutrinos, however, will be a nice bonus, providing an independent flux measurement in a geomagnetic environment very different from SuperKamiokande. This talk will provide a brief overview of atmospheric neutrino detection in SNO, including the advantages that come from being 2 km underground, as well as further detail on what we expect to see and some of what has been seen so far.

Nally, Christian

2000-05-01

110

Minimal predictive see-saw model with normal neutrino mass hierarchy  

E-print Network

We consider the type I see-saw model with two right-handed neutrinos and a normal neutrino mass hierarchy and impose a zero coupling between the right-handed neutrino mainly responsible for the atmospheric neutrino mass and the electron neutrino. We derive a master formula which relates see-saw input parameters in a one to one correspondence with physical neutrino observables. Using the master formula we search for simple ratios of couplings consistent with current data on neutrino mass and lepton mixing. We discover a minimal predictive example in which the right-handed neutrino mainly responsible for the atmospheric neutrino mass has couplings to (nu_e, nu_mu, nu_tau) proportional to (0,1,1) and the right-handed neutrino mainly responsible for the solar neutrino mass has couplings to (nu_e, nu_mu, nu_tau) proportional to (1,1,3) or (1,3,1), with a relative phase eta = -/+ pi/3, providing the link between leptogenesis and CP violation in neutrino oscillation experiments. We show how these patterns of couplings could arise from an A_4 family symmetry model of leptons which predicts all the PMNS parameters in terms of the neutrino mass ratio m_2/m_3, corresponding to approximate Tri-bimaximal-Cabibbo mixing, accurate to one degree, with the prediction delta = +/- pi/2.

Stephen F. King

2013-04-23

111

B-L Neutrinos  

E-print Network

Neutrino masses and mixings are analyzed in terms of left-handed fields and a 6x6 complex symmetric mass matrix whose singular values are the neutrino masses. An angle theta_nu characterizes the kind of the neutrinos, with theta_nu=0 for Dirac neutrinos and theta_nu=pi/2 for Majorana neutrinos. At theta_nu = 0 baryon-minus-lepton number is conserved. If theta_nu is approximately zero, the six neutrino masses coalesce into three nearly degenerate pairs. Thus the tiny mass differences exhibited in the solar and atmospheric neutrino experiments are naturally explained by the approximate conservation of B-L. Neutrinos are nearly Dirac fermions. This B-L model leads to these predictions: neutrinos oscillate mainly between flavor eigenfields and sterile eigenfields, and so the appearance of neutrinos and antineutrinos is suppressed; neutrinos may well be of cosmological importance; in principle the disappearance of the tau neutrino should be observable; and neutrinoless double-beta decay is suppressed by an extra factor of 10^(-5) and so will not be seen in the Heidelberg/Moscow, IGEX, GENIUS, or CUORE experiments.

Kevin Cahill

1999-12-26

112

NOVA: Hunting Solar Neutrinos  

NSDL National Science Digital Library

Check out this NOVA site for an interview with the late astrophysicist John Bahcall, who produced a detailed theory of solar neutrino emission. In the interview he describes his decades-long effort to reconcile the differences between his theory and solar neutrino measurements and the eventual resolution. The site also includes photographs and links to more information about neutrinos.

2006-12-01

113

Solar Neutrinos Kamioka Observatory  

E-print Network

Solar Neutrinos Y. Suzuki Kamioka Observatory Institute for Cosmic Ray Research University of Tokyo Higashi-Mozumi, Kamioka Gifu 506-1205, Japan 1 Introduction We now recognize that neutrinos have #12;nite masses. In 1998, the Super-Kamiokande experiment found evidence for the atmospheric neutrino oscillation

Tokyo, University of

114

Neutrino Magnetic Moment  

E-print Network

Current experimental and observational limits on the neutrino magnetic moment are reviewed. Implications of the recent results from the solar and reactor neutrino experiments for the value of the neutrino magnetic moment are discussed. It is shown that spin-flavor precession in the Sun is suppressed.

A. B. Balantekin

2006-01-13

115

Neutrino Astronomy Scott Wilbur  

E-print Network

V protons, which should be created with neutrinos, have been seen Can be used to observe possible dark Particle Physics Extremely long baseline for neutrino oscillation studies Dark Matter Searches Many dark Detector Picture from AMANDA II Web Site: http://www.amanda.uci.edu #12;Advantages of Neutrino Astronomy

Golwala, Sunil

116

Neutrino oscillations and neutrino-electron scattering  

SciTech Connect

Neutrino flavor oscillations can significantly alter the cross section for neutrino-electron scattering. As a result, such oscillations can affect the comparison between existing reactor data and theories of neutral-current processes. They may also lead to strikingly large effects in high-energy accelerator experiments.

Kayser, B.; Rosen, S.P.

1980-10-01

117

Neutrino observations from the Sudbury Neutrino Observatory  

SciTech Connect

The Sudbury Neutrino Observatory (SNO) is a water imaging Cherenkov detector. Its usage of 1000 metric tons of D{sub 2}O as target allows the SNO detector to make a solar-model independent test of the neutrino oscillation hypothesis by simultaneously measuring the solar {nu}{sub e} flux and the total flux of all active neutrino species. Solar neutrinos from the decay of {sup 8}B have been detected at SNO by the charged-current (CC) interaction on the deuteron and by the elastic scattering (ES) of electrons. While the CC reaction is sensitive exclusively to {nu}{sub e}, the ES reaction also has a small sensitivity to {nu}{sub {mu}} and {nu}{sub {tau}}. In this paper, recent solar neutrino results from the SNO experiment are presented. It is demonstrated that the solar flux from {sup 8}B decay as measured from the ES reaction rate under the no-oscillation assumption is consistent with the high precision ES measurement by the Super-Kamiokande experiment. The {nu}{sub e} flux deduced from the CC reaction rate in SNO differs from the Super-Kamiokande ES results by 3.3{sigma}. This is evidence for an active neutrino component, in additional to {nu}{sub e}, in the solar neutrino flux. These results also allow the first experimental determination of the total active {sup 8}B neutrino flux from the Sun, and is found to be in good agreement with solar model predictions.

Ahmad, Q.R.; Allen, R.C.; Andersen, T.C.; Anglin, J.D.; Barton,J.C.; Beier, E.W.; Bercovitch, M.; Bigu, J.; Biller, S.D.; Black, R.A.; Blevis, I.; Boardman, R.J.; Boger, J.; Bonvin, E.; Boulay, M.G.; Bowler,M.G.; Bowles, T.J.; Brice, S.J.; Browne, M.C.; Bullard, T.V.; Buhler, G.; Cameron, J.; Chan, Y.D.; Chen, H.H.; Chen, M.; Chen, X.; Cleveland, B.T.; Clifford, E.T.H.; Cowan, J.H.M.; Cowen, D.F.; Cox, G.A.; Dai, X.; Dalnoki-Veress, F.; Davidson, W.F.; Doe, P.J.; Doucas, G.; Dragowsky,M.R.; Duba, C.A.; Duncan, F.A.; Dunford, M.; Dunmore, J.A.; Earle, E.D.; Elliott, S.R.; Evans, H.C.; Ewan, G.T.; Farine, J.; Fergani, H.; Ferraris, A.P.; Ford, R.J.; Formaggio, J.A.; Fowler, M.M.; Frame, K.; Frank, E.D.; Frati, W.; Gagnon, N.; Germani, J.V.; Gil, S.; Graham, K.; Grant, D.R.; Hahn, R.L.; Hallin, A.L.; Hallman, E.D.; Hamer, A.S.; Hamian, A.A.; Handler, W.B.; Haq, R.U.; Hargrove, C.K.; Harvey, P.J.; Hazama, R.; Heeger, K.M.; Heintzelman, W.J.; Heise, J.; Helmer, R.L.; Hepburn, J.D.; Heron, H.; Hewett, J.; Hime, A.; Hykawy, J.G.; Isaac,M.C.P.; Jagam, P.; Jelley, N.A.; Jillings, C.; Jonkmans, G.; Kazkaz, K.; Keener, P.T.; Klein, J.R.; Knox, A.B.; Komar, R.J.; Kouzes, R.; Kutter,T.; Kyba, C.C.M.; Law, J.; Lawson, I.T.; Lay, M.; Lee, H.W.; Lesko, K.T.; Leslie, J.R.; Levine, I.; Locke, W.; Luoma, S.; Lyon, J.; Majerus, S.; Mak, H.B.; Maneira, J.; Manor, J.; Marino, A.D.; McCauley, N.; McDonald,D.S.; McDonald, A.B.; McFarlane, K.; McGregor, G.; Meijer, R.; Mifflin,C.; Miller, G.G.; Milton, G.; Moffat, B.A.; Moorhead, M.; Nally, C.W.; Neubauer, M.S.; Newcomer, F.M.; Ng, H.S.; Noble, A.J.; Norman, E.B.; Novikov, V.M.; O'Neill, M.; Okada, C.E.; Ollerhead, R.W.; Omori, M.; Orrell, J.L.; Oser, S.M.; Poon, A.W.P.; Radcliffe, T.J.; Roberge, A.; Robertson, B.C.; Robertson, R.G.H.; Rosendahl, S.S.E.; Rowley, J.K.; Rusu, V.L.; Saettler, E.; Schaffer, K.K.; Schwendener,M.H.; Schulke, A.; Seifert, H.; Shatkay, M.; Simpson, J.J.; Sims, C.J.; et al.

2001-09-24

118

NEW SOLAR HOMES PARTNERSHIP Fourth Edition  

E-print Network

solar energy systems. The buildings must achieve energy efficiency levels greater than the requirements Partnership, NSHP, Energy Commission, PV, solar energy system, energy efficiency, standards, Title 24 Part 6 NEW SOLAR HOMES PARTNERSHIP GUIDEBOOK Fourth Edition CALIFORNIA ENERGY COMMISSION Edmund

119

Search for long-lived massive neutrinos in Z decays  

Microsoft Academic Search

We search for events in the Mark II detector at SLAC Linear Collider with the topology of a Z boson decaying into a pair of long-lived massive particles. No events that are consistent with the search hypothesis are found. Interpreting the long-lived particle as a sequential Dirac neutrino nu4 of the fourth generation, we exclude at the 95% confidence level

C. K. Jung; R. van Kooten; G. S. Abrams; C. E. Adolphsen; D. Averill; J. Ballam; B. C. Barish; T. Barklow; B. A. Barnett; J. Bartelt; S. Bethke; D. Blockus; G. Bonvicini; A. Boyarski; B. Brabson; A. Breakstone; F. Bulos; P. R. Burchat; D. L. Burke; R. J. Cence; J. Chapman; M. Chmeissani; D. Cords; D. P. Coupal; P. Dauncey; H. C. Destaebler; D. E. Dorfan; J. M. Dorfan; D. C. Drewer; R. Elia; G. J. Feldman; D. Fernandes; R. C. Field; W. T. Ford; C. Fordham; R. Frey; D. Fujino; K. K. Gan; C. Gatto; E. Gero; G. Gidal; T. Glanzman; G. Goldhaber; J. J. Gomez Cadenas; G. Gratta; G. Grindhammer; P. Grosse-Wiesmann; G. Hanson; R. Harr; B. Harral; F. A. Harris; C. M. Hawkes; K. Hayes; C. Hearty; C. A. Heusch; M. D. Hildreth; T. Himel; D. A. Hinshaw; S. J. Hong; D. Hutchinson; J. Hylen; W. R. Innes; R. G. Jacobsen; J. A. Jaros; J. A. Kadyk; J. Kent; M. King; S. R. Klein; D. S. Koetke; S. Komamiya; W. Koska; L. A. Kowalski; W. Kozanecki; J. F. Kral; M. Kuhlen; L. Labarga; A. J. Lankford; R. R. Larsen; F. Le Diberder; M. E. Levi; A. M. Litke; X. C. Lou; V. Lüth; J. A. McKenna; J. A. Matthews; T. Mattison; B. D. Milliken; K. C. Moffeit; C. T. Munger; W. N. Murray; J. Nash; H. Ogren; K. F. O'shaughnessy; S. I. Parker; C. Peck; M. L. Perl; F. Perrier; M. Petradza; R. Pitthan; F. C. Porter; P. Rankin; K. Riles; F. R. Rouse; D. R. Rust; H. F. Sadrozinski; M. W. Schaad; B. A. Schumm; A. Seiden; J. G. Smith; A. Snyder; E. Soderstrom; D. P. Stoker; R. Stroynowski; M. Swartz; R. Thun; G. H. Trilling; P. Voruganti; S. R. Wagner; S. Watson; P. Weber; A. Weigend; A. J. Weinstein; A. J. Weir; E. Wicklund; M. Woods; D. Y. Wu; M. Yurko; C. Zaccardelli; C. von Zanthier

1990-01-01

120

Impact of eV-mass sterile neutrinos on neutrino-driven supernova outflows  

SciTech Connect

Motivated by recent hints for sterile neutrinos from the reactor anomaly, we study active-sterile conversions in a three-flavor scenario (2 active + 1 sterile families) for three different representative times during the neutrino-cooling evolution of the proto-neutron star born in an electron-capture supernova. In our ''early model'' (0.5 s post bounce), the ?{sub e}-?{sub s} MSW effect driven by ?m{sup 2} = 2.35eV{sup 2} is dominated by ordinary matter and leads to a complete ?{sub e}-?{sub s} swap with little or no trace of collective flavor oscillations. In our ''intermediate'' (2.9 s p.b.) and ''late models'' (6.5 s p.b.), neutrinos themselves significantly modify the ?{sub e}-?{sub s} matter effect, and, in particular in the late model, ?? refraction strongly reduces the matter effect, largely suppressing the overall ?{sub e}-?{sub s} MSW conversion. This phenomenon has not been reported in previous studies of active-sterile supernova neutrino oscillations. We always include the feedback effect on the electron fraction Y{sub e} due to neutrino oscillations. In all examples, Y{sub e} is reduced and therefore the presence of sterile neutrinos can affect the conditions for heavy-element formation in the supernova ejecta, even if probably not enabling the r-process in the investigated outflows of an electron-capture supernova. The impact of neutrino-neutrino refraction is strong but complicated, leaving open the possibility that with a more complete treatment, or for other supernova models, active-sterile neutrino oscillations could generate conditions suitable for the r-process.

Tamborra, Irene; Raffelt, Georg G. [Max-Planck-Institut für Physik (Werner-Heisenberg-Institut), Föhringer Ring 6, 80805 München (Germany); Hüdepohl, Lorenz; Janka, Hans-Thomas, E-mail: tamborra@mpp.mpg.de, E-mail: raffelt@mpp.mpg.de, E-mail: lorenz@mpa-garching.mpg.de, E-mail: thj@mpa-garching.mpg.de [Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching (Germany)

2012-01-01

121

New Results on Neutrino Magnetic Moments and on Democratic Neutrinos  

E-print Network

I discuss the two separate issues on neutrino physics. First, the new bounds on tensorial couplings of neutrinos to charged fermions from the existing limits on neutrino transition magnetic moments. Second, explanation of the atmospheric and solar neutrino data in the democratic neutrino theory with only one free parameter (in the leading order), using the effect of incoherence.

Dmitry Zhuridov

2014-05-08

122

Neutrinos and Mass  

NSDL National Science Digital Library

This week's In the News highlights neutrinos and the recent discovery that neutrinos have mass -- a discovery that has forced physicists to rethink the behavior of elementary particles. The seven resources provided discuss various aspects of the topic. First hypothesized by Wolfgang Pauli in 1931, the existence of neutrinos was not proven until 1956, by Drs. Frederick Reines and Clyde Cowan of the Los Alamos National Laboratory. In a collaborative effort between Japan and the US (at the Kamioka Neutrino Observatory), scientists recently reported their findings at a Neutrino Conference in Japan.

Harris, Kathryn L.

123

Mass determination of neutrinos  

NASA Technical Reports Server (NTRS)

A time-energy correlation method has been developed to determine the signature of a nonzero neutrino mass in a small sample of neutrinos detected from a distant source. The method is applied to the Kamiokande II (Hirata et al., 1987) and IMB (Bionta et al., 1987) observations of neutrino bursts from SN 1987A. Using the Kamiokande II data, the neutrino rest mass is estimated at 2.8 + 2.0, - 1.4 eV and the initial neutrino pulse is found to be less than 0.3 sec full width, followed by an emission tail lasting at least 10 sec.

Chiu, Hong-Yee

1988-01-01

124

The Sudbury Neutrino Observatory  

NSDL National Science Digital Library

The size of a ten-story building, 6800 feet underground at the Creighton mine in Ontario; the Sudbury Neutrino Observatory is a telescope built to study neutrinos and the core of the sun. Students can learn how Cherenkov Radiation is produced and used to detect neutrino properties. Scientists can read the newly published paper dealing with the measurement of Total Active 8B Solar Neutrino Flux using NaCl, as well as other published papers and Conference Proceedings. The site also offers illustrations such as neutrinos striking heavy water and the attractive Double-Ring Event.

125

Neutrinos from AGN  

NASA Technical Reports Server (NTRS)

The great penetrating power of neutrinos makes them ideal probe of astrophysical sites and conditions inaccessible to other forms of radiation. These are the centers of stars (collapsing or not) and the centers of Active Galactic Nuclei (AGN). It has been suggested that AGN presented a very promising source of high energy neutrinos, possibly detectable by underwater neutrino detectors. This paper reviews the evolution of ideas concerning the emission of neutrinos from AGN in view of the more recent developments in gamma-ray astronomy and their implications for the neutrino emission from these class of objects.

Kazanas, Demosthenes; White, Nicholas E. (Technical Monitor)

2000-01-01

126

Nucleosynthesis and Neutrinos  

SciTech Connect

Neutrinos play the critical roles in nucleosynthesis of light-to-heavy mass nuclei in core-collapse supernovae. We study the nucleosynthesis induced by neutrino interactions and find suitable average neutrino temperatures in order to explain the observed solar system abundances of several isotopes {sup 7}Li, {sup 11}B, {sup 138}La and {sup 180}Ta. These isotopes are predominantly synthesized by the supernova {nu}-process. We also study the neutrino oscillation effects on their abundances and propose a method to determine the unknown neutrino oscillation parameters, i.e. {theta}{sub 13} and mass hierarchy.

Kajino, Toshitaka [National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); Department of Astronomy, Graduate School of Science, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033 (Japan)

2011-05-06

127

Weighing the neutrino  

NASA Astrophysics Data System (ADS)

We investigate the potential of short-baseline experiments in order to measure the dispersion relation of the (muon) neutrino, with a prospect of eventually measuring the neutrino mass. As a byproduct, the experiment would help to constrain parameters of Lorentz-violating effects in the neutrino sector. The potential of a high-flux laser-accelerated proton beam (e.g., at the upcoming ELI facility), incident on a thick target composed of a light element to produce pions, with a subsequent decay to muons and muon-neutrinos, is discussed. We find a possibility for a muon neutrino mass measurement of unprecedented accuracy.

Jentschura, U. D.; Horváth, D.; Nagy, S.; Nándori, I.; Trócsányi, Z.; Ujvári, B.

2014-02-01

128

Supernova Neutrino Detection  

E-print Network

A core-collapse supernova will produce an enormous burst of neutrinos of all flavors in the few-tens-of-MeV range. Measurement of the flavor, time and energy structure of a nearby core-collapse neutrino burst will yield answers to many physics and astrophysics questions. The neutrinos left over from past cosmic supernovae are also observable, and their detection will improve knowledge of core collapse rates and average neutrino emission. This review describes experimental techniques for detection of core-collapse neutrinos, as well as the sensitivities of current and future detectors.

Kate Scholberg

2012-05-27

129

Democratic Neutrino Theory  

E-print Network

New theory of neutrino masses and mixing is introduced. This theory is based on a simple S_3 symmetric democratic neutrino mass matrix, and predicts the neutrino mass spectrum of normal ordering. Taking into account the matter effect and proper averaging of the oscillations, this theory agrees with the variety of atmospheric, solar and accelerator neutrino data. Moreover, the absolute scale of the neutrino masses m of 0.03 eV is determined in this theory, using the atmospheric neutrino oscillation data. In case of tiny perturbations in the democratic mass matrix only one this scale parameter m allows to explain the mentioned above neutrino results, and the theory has huge predictive power.

Dmitry Zhuridov

2014-05-21

130

Properties of neutrinos: Recent results  

SciTech Connect

Recent progress in experimental determinations of the properties of neutrinos is summarized. In particular, the extensive work on direct kinematic measurements of neutrino mass, on neutrino counting and on neutrino oscillations is highlighted. It is concluded that there may already be sufficient information to fix the masses of the neutrinos, but the evidence is still far from convincing. 63 refs., 13 figs.

Robertson, R.G.H.

1987-01-01

131

Three sterile neutrinos in E6  

NASA Astrophysics Data System (ADS)

Candidates for unification of the electroweak and strong interactions include the grand unified groups SU(5), SO(10), and the exceptional group E6. The 27-dimensional fundamental representation of E6 contains exotic fermions, including weak isosinglet quarks of charge -1/3, vectorlike weak isodoublet leptons, and neutral leptons which are singlets under both left-handed and right-handed SU(2). These last are candidates for light "sterile" neutrinos, hinted at by some recent short-baseline neutrino experiments.In order to accommodate three families of quarks and charged leptons, an E6 model must contain three 27-plets, each of which contains a sterile neutrino candidate n. The mixing pattern within a 27-plet is described, and experimental consequences are discussed.

Rosner, Jonathan L.

2014-08-01

132

SuperGZK neutrinos  

E-print Network

The sources and fluxes of superGZK neutrinos, $E>10^{20}$ eV, are discussed. The fluxes of {\\em cosmogenic neutrinos}, i.e. those produced by ultra-high energy cosmic rays (UHECR) interacting with CMB photons, are calculated in the models, which give the good fit to the observed flux of UHECR. The best fit given in no-evolutionary model with maximum acceleration energy $E_{\\rm max}=1\\times 10^{21}$ eV results in very low flux of superGZK neutrinos an order of magnitude lower than the observed flux of UHECR. The predicted neutrino flux becomes larger and observable by next generation detectors at energies $10^{20} - 10^{21}$ eV in the evolutionary models with $E_{\\rm max}=1\\times 10^{23}$ eV. The largest cosmogenic neutrino flux is given in models with very flat generation spectrum, e.g. $\\propto E^{-2}$. The neutrino energies are naturally high in the models of {\\em superheavy dark matter and topological defects}. Their fluxes can also be higher than those of cosmogenic neutrinos. The largest fluxes are given by {\\em mirror neutrinos}, oscillating into ordinary neutrinos. Their fluxes obey some theoretical upper limit which is very weak, and in practice these fluxes are most efficiently limited now by observations of radio emission from neutrino-induced showers.

V. Berezinsky

2005-09-22

133

The ideal neutrino beams  

NASA Astrophysics Data System (ADS)

The advance in neutrino oscillation physics is driven by the availability of well characterized and high flux neutrino beams. The three present options for the next generation neutrino oscillation facility are super beams, neutrino factories and beta-beams. A super-beam is a very high intensity classical neutrino beam generated by protons impinging on a target where the neutrinos are generated by the secondary particles decaying in a tunnel down streams of the target. In a neutrino factory the neutrinos are generated from muons decaying in a storage ring with long straight sections pointing towards the detectors. In a beta-beam the neutrinos are also originating from decay in a storage ring but the decaying particles are radioactive ions rather than muons. I will in this presentation review the three options and discuss the pros and cons of each. The present joint design effort for a future high intensity neutrino oscillation in Europe within a common EU supported design study, EURONU, will also be presented. The design study will explore the physics reach, the detectors, the feasibility, the safety issues and the cost for each of the options so that the the community can take a decision on what to build when the facilities presently under exploitation and construction have to be replaced.

Lindroos, Mats

2009-06-01

134

An economic theory of the fourth hurdle.  

PubMed

Third party payers' decision processes for financing health technologies ('fourth hurdle' processes) are subject to intensive descriptive empirical investigation. This paper addresses the need for a theoretical foundation of this research and develops a theoretical framework for analysing fourth hurdle processes from an economics perspective. On the basis of a decision-analytic framework and the theory of agents, fourth hurdle processes are described as sets of institutions to maximize the value derived from finite healthcare resources. Benefits are assumed to arise from the value of better information about and better implementation of the most cost-effective choice. Implementation is improved by decreased information asymmetries and better alignment of incentives. This decreases the effects of ex ante and ex post moral hazard on service provision. Potential indicators of high benefit include high costs associated with wrong decisions and large population sizes affected by the decision. The framework may serve as a basis both for further theoretical work, for example, on the appropriate degree of participation as well as further empirical work, for example, on comparative assessments of fourth hurdle processes. It needs to be complemented by frameworks for analysing fourth hurdle institutions developed by other disciplines such as bioethics or law. PMID:22544431

Rogowski, W H

2013-05-01

135

Acquiring information about neutrino parameters by detecting supernova neutrinos  

SciTech Connect

We consider the supernova shock effects, the Mikheyev-Smirnov-Wolfenstein effects, the collective effects, and the Earth matter effects in the detection of type II supernova neutrinos on the Earth. It is found that the event number of supernova neutrinos depends on the neutrino mass hierarchy, the neutrino mixing angle {theta}{sub 13}, and neutrino masses. Therefore, we propose possible methods to identify the mass hierarchy and acquire information about {theta}{sub 13} and neutrino masses by detecting supernova neutrinos. We apply these methods to some current neutrino experiments.

Huang, Ming-Yang; Guo, Xin-Heng [College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875 (China); Young, Bing-Lin [Department of Physics and Astronomy, Iowa State University, Ames, Iowa 5001 (United States); Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 (China)

2010-08-01

136

Topological Constraints on Long-Distance Neutrino Mixtures  

E-print Network

A new internal description of fundamental fermions (quarks and leptons), based on a matrix-generalization (F) of the scalar fermion-number f, predicts that only three families of quarks and leptons, and their associated neutrinos (nu_e, nu_mu and nu_tau), exist. Moreover, this description places important topological constraints on neutrino mixing. For example, with respect to F, the topology of the nu_e (nu_mu or nu_tau) is that of a cylinder (Mobius strip). Assuming that a change in topology dudring neutrino-neutrino transitions is suppressed (e.g., one cannot continuously deform a donut into a sphere), while neutrino-neutrino transitions without topology-change are (relatively) enhanced, one may have an explanation for recent short-distance experimental observations of (nearly) maximal nu_mu-nu_tau mixing at the Super Kamiokande. To test this idea, I was able to use simple topological arguments to deduce a matrix describing long-distance neutrino mixtures, which is identical to that proposed by Georgi and Glashow on different grounds. Experimental confirmation of this prediction would strongly support the new description of fundamental fermions, which requires, among other things, that the nu_e and (nu_mu or nu_tau) neutrinos start life as topoligically-distinct quantum objects.

Gerald L. Fitzpatrick

2000-07-13

137

Measurable neutrino mass scale in A{sub 4}xSU(5)  

SciTech Connect

We propose a supersymmetric A{sub 4}xSU(5) model of quasidegenerate neutrinos which predicts the effective neutrino mass m{sub ee} relevant for neutrinoless double beta decay to be proportional to the neutrino mass scale, thereby allowing its determination approximately independently of unknown Majorana phases. Such a natural quasidegeneracy is achieved by using A{sub 4} family symmetry (as an example of a non-Abelian family symmetry with real triplet representations) to enforce a contribution to the neutrino mass matrix proportional to the identity. Tribimaximal neutrino mixing as well as quark CP violation with {alpha}{approx_equal}90 deg. d a leptonic CP phase {delta}{sub MNS{approx_equal}}90 deg. arise from the breaking of the A{sub 4} family symmetry by the vacuum expectation values of four 'flavon' fields pointing in specific postulated directions in flavor space.

Antusch, S.; Spinrath, M. [Max-Planck-Institut fuer Physik (Werner-Heisenberg-Institut), Foehringer Ring 6, D-80805 Muenchen (Germany); King, Stephen F. [School of Physics and Astronomy, University of Southampton, SO17 1BJ Southampton (United Kingdom)

2011-01-01

138

Jiangmen Underground Neutrino Observatory  

E-print Network

The Jiangmen Underground Neutrino Observatory (JUNO) is a multipurpose neutrino-oscillation experiment designed to determine the neutrino mass hierarchy and to precisely measure oscillation parameters by detecting reactor antineutrinos, observe supernova neutrinos, study the atmospheric, solar neutrinos and geo-neutrinos, and perform exotic searches, with a 20 kiloton liquid scintillator detector of unprecedented $3\\%$ energy resolution (at 1 MeV) at 700-meter deep underground and to have other rich scientific possibilities. Currently MC study shows a sensitivity of the mass hierarchy to be $\\overline{\\Delta\\chi^2}\\sim 11$ and $\\overline{\\Delta\\chi^2}\\sim 16$ in a relative and an absolute measurement, respectively. JUNO has been approved by Chinese Academy of Sciences in 2013, and an international collaboration was established in 2014. The civil construction is in preparation and the R$\\&$D of the detectors are ongoing. A new offline software framework was developed for the detector simulation, the event ...

He, Miao

2014-01-01

139

Neutrinos: Nature's Ghosts?  

SciTech Connect

Dr. Don Lincoln introduces one of the most fascinating inhabitants of the subatomic realm: the neutrino. Neutrinos are ghosts of the microworld, almost not interacting at all. In this video, he describes some of their properties and how they were discovered. Studies of neutrinos are expected to be performed at many laboratories across the world and to form one of the cornerstones of the Fermilab research program for the next decade or more.

Lincoln, Don

2013-06-18

140

Neutrinos from gravitational collapse  

SciTech Connect

Detailed calculations are made of the neutrino spectra emitted during gravitational collapse events (Type II supernovae). Those aspects of the neutrino signal which are relatively independent of the collapse model and those aspects which are sensitive to model details are discussed. The easier-to-detect high energy tail of the emitted neutrinos has been calculated using the Boltzmann equation which is compared with the result of the traditional multi-group flux limited diffusion calculations. 8 figs., 28 refs.

Mayle, R.; Wilson, J.R.; Schramm, D.N.

1986-05-01

141

Borexino and solar neutrinos  

Microsoft Academic Search

Borexino, a large volume detector for low energy neutrino spectroscopy, is currently running underground at the Laboratori Nazionali del Gran Sasso, Italy. The measured in- teraction rate of the 0.862 MeV 7Be neutrinos equals to 49 3stat 4syst counts\\/(day 100 ton). The hypothesis of no oscillation for 7Be solar neutrinos is inconsistent with the Borexino measurement at the 4 C.L..

I. N. Machulina; C. Arpesella; M. Balata; G. Bellini; J. Benziger; S. Bonetti; A. Brigatti; B. Cac; L. Cadonati; F. Calaprice; C. Carraro; G. Cecchet; A. Chavarria; M. Chen; D. D'Angelo; A. de Bari; A. de Bellefon; A. Derbin; M. Deutsch; A. di Credico; R. Eisenstein; F. Elisei; A. Etenko; R. Fernholz; K. Fomenko; R. Ford; D. Franco; B. Freudiger; C. Galbiati; F. Gatti; S. Gazzana; M. Giammarchi; D. Giugni; M. Goeger; T. Goldbrunner; A. Goretti; C. Grieb; C. Hagner; W. Hampel; E. Harding; S. Hardy; F. X. Hartman; T. Hertrich; G. Heusser; Aldo Ianni; Andrea Ianni; M. Joyce; J. Kiko; T. Kirsten; V. Kobychev; G. Korga; G. Korschinek; D. Kryn; V. Lagomarsino; P. Lamarche; M. Lauben; C. Lendvai; M. Leung; T. Lewke; E. Litvinovich; B. Loer; P. Lombardi; L. Ludhova; I. Machulin; S. Malvezzi; S. Manecki; J. Maneira; W. Maneschg; I. Manno; D. Manuzio; G. Manuzio; A. Martemianov; F. Masetti; U. Mazzucato; K. McCarty; D. McKinsey; Q. Meindl; E. Meroni; L. Miramonti; M. Misiaszek; D. Montanari; M. E. Monzani; V. Muratova; P. Mu; H. Neder; A. Nelson; L. Niedermeier; L. Oberauer; M. Obolensky; M. Orsini; F. Ortica; M. Pallavicini; L. Papp; S. Parmeggiano; L. Perasso; A. Pocar; R. S. Raghavan; G. Ranucci; W. Rau; A. Razeto; E. Resconi; P. Risso; A. Romani; D. Rountree; A. Sabelnikov; R. Sal; C. Salvo; D. Schimizzi; S. Schonert; T. Shutt; H. Simgen; M. Skorokhvatov; O. Smirnov; A. Sonnenschein; A. Sotnikov; S. Sukhotin; Y. Suvorov; R. Tartaglia; G. Testera; D. Vignaud; S. Vitale; R. B. Vogelaar; F. von Feilitzsch; R. von Hentig; T. von Hentig; M. Wojcik; M. Wurm; O. Zaimidoroga; S. Zavatarelli; G. Zuzel

142

Neutrinos in the Electron  

SciTech Connect

I will show that one half of the rest mass of the electron consists of electron neutrinos and that the other half of the rest mass of the electron consists of the mass in the energy of electric oscillations. With this composition we can explain the rest mass of the electron, its charge, its spin and its magnetic moment We have also determined the rest masses of the muon neutrino and the electron neutrino.

Koschmieder, E. L. [Center for Statistical Mechanics, University of Texas at Austin, Austin TX 78712 (United States)

2007-04-28

143

Neutrinos: Nature's Ghosts?  

ScienceCinema

Dr. Don Lincoln introduces one of the most fascinating inhabitants of the subatomic realm: the neutrino. Neutrinos are ghosts of the microworld, almost not interacting at all. In this video, he describes some of their properties and how they were discovered. Studies of neutrinos are expected to be performed at many laboratories across the world and to form one of the cornerstones of the Fermilab research program for the next decade or more.

Lincoln, Don

2014-08-12

144

Bolometric detection of neutrinos  

NASA Technical Reports Server (NTRS)

Elastic neutrino scattering off electrons in crystalline silicon at 1-10 mK results in measurable temperature changes in macroscopic amounts of material, even for low-energy (less than 0.41-MeV) pp neutrinos from the sun. New detectors for bolometric measurement of low-energy neutrino interactions, including coherent nuclear elastic scattering, are proposed. A new and more sensitive search for oscillations of reactor antineutrinos is practical (about 100 kg of Si), and would lay the groundwork for a more ambitious measurement of the spectrum of pp, Be-7, and B-8 solar neutrinos, and of supernovae anywhere in the Galaxy (about 10 tons of Si).

Cabrera, B.; Krauss, L. M.; Wilczek, F.

1985-01-01

145

Multimessenger Astronomy and Neutrinos  

NASA Astrophysics Data System (ADS)

Neutrinos play a very important role in multimessenger astronomy. In this talk, I start with a simple argument on how bright the Universe is in both photons and neutrinos. It is remarkable that one can easily show that the neutrinos, especially those emitted from past core-collapse supernovae, form the brightest radiation component in the Universe, ever emitted from astrophysical sources. The detection of this cosmic supernova neutrino background has not been made yet, but is almost guaranteed in the near future. Thus, I review theoretical predictions of the supernova neutrino background, and the latest upper limits experimentally obtained on its flux. Then I discuss prospects of detecting supernova neutrinos from nearby galaxies. With upcoming Mton detectors, or hopefully with a multi-Mton detector, one could study not only supernova neutrinos but also a true stellar death rate, hidden black-hole formation, etc. Finally, I discuss detectability of high-energy neutrinos and implications for underlying supernova-gamma-ray burst connection. Detecting neutrinos will not only give unique diagnostics but also help find gravitational waves.

Ando, Shin'ichiro

2013-04-01

146

Neutrino Oscillation Physics  

E-print Network

To complement the neutrino-physics lectures given at the 2011 International School on Astro Particle Physics devoted to Neutrino Physics and Astrophysics (ISAPP 2011; Varenna, Italy), at the 2011 European School of High Energy Physics (ESHEP 2011; Cheila Gradistei, Romania), and, in modified form, at other summer schools, we present here a written description of the physics of neutrino oscillation. This description is centered on a new way of deriving the oscillation probability. We also provide a brief guide to references relevant to topics other than neutrino oscillation that were covered in the lectures.

Kayser, Boris

2014-01-01

147

Molybdenum solar neutrino experiment  

SciTech Connect

The goal of the molybdenum solar neutrino experiment is to deduce the /sup 8/B solar neutrino flux, averaged over the past several million years, from the concentration of /sup 98/Tc in a deeply buried molybdenum deposit. The experiment is important to an understanding of stellar processes because it will shed light on the reason for the discrepancy between theory and observation of the chlorine solar neutrino experiment. Possible reasons for the discrepancy may lie in the properties of neutrinos (neutrino oscillations or massive neutrinos) or in deficiencies of the standard solar model. The chlorine experiment only measures the /sup 8/B neutrino flux in current times and does not address possible temporal variations in the interior of the sun, which are also not considered in the standard model. In the molybdenum experiment, we plan to measure /sup 98/Tc (4.2 Myr), also produced by /sup 8/B neutrinos, and possibly /sup 97/Tc (2.6 Myr), produced by lower energy neutrinos.

Wolfsberg, K.; Cowan, G.A.; Bryant, E.A.; Daniels, K.S.; Downey, S.W.; Haxton, W.C.; Niesen, V.G.; Nogar, N.S.; Miller, C.M.; Rokop, D.J.

1984-01-01

148

Summary of the Fourth AIAA CFD Drag Prediction Workshop  

NASA Technical Reports Server (NTRS)

Results from the Fourth AIAA Drag Prediction Workshop (DPW-IV) are summarized. The workshop focused on the prediction of both absolute and differential drag levels for wing-body and wing-body-horizontal-tail configurations that are representative of transonic transport air- craft. Numerical calculations are performed using industry-relevant test cases that include lift- specific flight conditions, trimmed drag polars, downwash variations, dragrises and Reynolds- number effects. Drag, lift and pitching moment predictions from numerous Reynolds-Averaged Navier-Stokes computational fluid dynamics methods are presented. Solutions are performed on structured, unstructured and hybrid grid systems. The structured-grid sets include point- matched multi-block meshes and over-set grid systems. The unstructured and hybrid grid sets are comprised of tetrahedral, pyramid, prismatic, and hexahedral elements. Effort is made to provide a high-quality and parametrically consistent family of grids for each grid type about each configuration under study. The wing-body-horizontal families are comprised of a coarse, medium and fine grid; an optional extra-fine grid augments several of the grid families. These mesh sequences are utilized to determine asymptotic grid-convergence characteristics of the solution sets, and to estimate grid-converged absolute drag levels of the wing-body-horizontal configuration using Richardson extrapolation.

Vassberg, John C.; Tinoco, Edward N.; Mani, Mori; Rider, Ben; Zickuhr, Tom; Levy, David W.; Brodersen, Olaf P.; Eisfeld, Bernhard; Crippa, Simone; Wahls, Richard A.; Morrison, Joseph H.; Mavriplis, Dimitri J.; Murayama, Mitcuhiro

2010-01-01

149

Contribution of Family Environment to Pediatric Cochlear Implant Users' Speech and Language Outcomes: Some Preliminary Findings  

ERIC Educational Resources Information Center

Purpose: To evaluate the family environments of children with cochlear implants and to examine relationships between family environment and postimplant language development and executive function. Method: Forty-five families of children with cochlear implants completed a self-report family environment questionnaire (Family Environment Scale-Fourth…

Holt, Rachael Frush; Beer, Jessica; Kronenberger, William G.; Pisoni, David B.; Lalonde, Kaylah

2012-01-01

150

Fourth order solutions of singularly perturbed boundary value problems by quarter-sweep iteration  

NASA Astrophysics Data System (ADS)

In previous studies, the effectiveness of the second-order quarter-sweep finite difference approximation equations has been shown in solving singularly perturbed boundary value problems. In this paper, however, we investigate the application of the fourth-order quarter-sweep finite difference approximation equation based on the fourth-order standard central difference scheme. To solve the problems numerically, discretization of the singularly perturbed problems via second-order and fourth-order finite difference schemes is proposed to form the corresponding system of linear algebraic equations. For comparison purpose, we also discuss on how to derive the basic formulation and implementation for the family of Successive Over-Relaxation (SOR) iterative methods such as FSSOR, HSSOR and QSSOR in solving the corresponding linear systems generated from the fourth-order discretization schemes based on full, half- and quarter-sweep cases. Some numerical tests were conducted to show that the accuracy of fourth-order finite difference schemes via the corresponding GS methods is more accurate than second-order schemes.

Sulaiman, J.; Hasan, M. K.; Othman, M.; Abdul Karim, S. A.

2013-04-01

151

Extended Mass Layoffs, Fourth Quarter 1998  

NSDL National Science Digital Library

Data from the fourth quarter 1998 release from the BLS, Extended Mass Layoffs, reveals that 1,660 mass layoff actions by employers resulted in 342,010 worker-job separations of more than 30 days from October through December of 1998.

152

Gross Domestic Product: Fourth Quarter 1999  

NSDL National Science Digital Library

A news release from the BEA reports that, in the fourth quarter of 1999, real gross domestic product continued to increase at an annual rate of 5.8 percent. Factors contributing to the rise included increases in personal consumption expenditures, government spending, inventory investment, and exports.

153

223THE FOURTH PARADIGM CRAIG MUNDIE | Microsoft  

E-print Network

are to achieve dramatic breakthroughs, new approaches will be required. We need to embrace the next, fourth discovery. Data-intensive science promises breakthroughs across a broad spectrum. As the Earth becomes breakthroughs. Another major advance is the emergence of megascale services that are hosted in the cloud

Narasayya, Vivek

154

99THE FOURTH PARADIGM HEALTH AND WELLBEING  

E-print Network

99THE FOURTH PARADIGM HEALTH AND WELLBEING I LucA cArDELLI Microsoft Research corrADo PrIAm challenges remain to building algo- rithmic models for the system-level understanding of biological processes. These challenges include the relationship between low-level local interactions and emer- gent high-level global

Narasayya, Vivek

155

Dynamical symmetry breaking with a fourth generation  

E-print Network

Adding a fourth generation to the Standard Model and assuming it to be valid up to some cutoff $\\Lambda$, we show that Yukawa couplings for the fourth generation are strong enough to drive electroweak symmetry breaking. Proposing a Coleman-Weinberg mechanism of electroweak symmetry breaking without self-interactions for the Higgs field at classical level, we show that the masses for the fourth generation consistent with electroweak precision data (including the $B\\to K \\pi$ CP asymmetries) imply a Higgs mass as low as $\\sim 350 $ and a cutoff $\\Lambda$ around 1-2 TeV. Similar results are obtained for the minimal supersymmetric extension of the standard model with four generations, which predicts soft breaking terms for masses of the fourth generation squarks of order 1 TeV. In both cases, the relation between Higgs mass and the masses of the new quarks is simple, implying that effects of physics beyond the Standard Model should be measurable at the LHC.

Delepine, D; Vaquera-Araujo, C A

2010-01-01

156

Fourth Graders Invent Ways of Computing Averages.  

ERIC Educational Resources Information Center

Presents three methods invented by fourth graders for obtaining the arithmetic mean. This presentation is in support of the idea that encouraging children to invent their own mathematical processes is a good way for them to clarify the idea of representativeness and consequently the teacher can facilitate the students' construction of higher…

Kamii, Constance; And Others

1996-01-01

157

The fourth industrial fluid properties simulation challenge  

Microsoft Academic Search

The primary goal of the fourth industrial fluid properties simulation challenge was to test the transferability of molecular simulation methods and intermolecular potentials (force fields) when applied to a wide variety of physical properties for a given industrially relevant small molecule. Force field parameters are often developed for, tested with, and applied to a relatively limited range property types. Methods

Fiona H. Case; John Brennan; Anne Chaka; Kerwin D. Dobbs; Daniel G. Friend; Peter A. Gordon; Jonathan D. Moore; James D. Olson; Richard B. Ross; Martin Schiller; Vincent K. Shen; Eric A. Stahlberg

2008-01-01

158

Sex Differences in Cognitive Abilities. Fourth Edition  

ERIC Educational Resources Information Center

The fourth edition of "Sex Differences in Cognitive Abilities" critically examines the breadth of research on this complex and controversial topic, with the principal aim of helping the reader to understand where sex differences are found--and where they are not. Since the publication of the third edition, there have been many exciting and…

Halpern, Diane F.

2011-01-01

159

Literature for Today's Young Adults. Fourth Edition.  

ERIC Educational Resources Information Center

Designed to help teachers open young minds to literature, this book presents criteria for evaluating books in all genres and their suggested classroom uses, an examination of hotly debated topics, and an overview of the significance of young adult literature. The fourth edition of the book features 30 boxed inserts containing essays by some of the…

Nilsen, Alleen Pace; Donelson, Kenneth L.

160

"Researching" with Third- and Fourth-Graders.  

ERIC Educational Resources Information Center

In order to instill in children the skills which will be basic to their school experience, words implying a process (such as "hemp,""parasite," and "vanilla") may be "researched" by third and fourth graders through the use of a dictionary, an encyclopedia, a supplementary book on the subject, and an interview with an adult. The child makes a…

Liston, Barbara

1970-01-01

161

Military History and Fourth Generation Warfare  

Microsoft Academic Search

This article examines ‘Fourth Generation Warfare’ (4GW), a theory of how warfare has evolved and is evolving, from the perspective of military history. The author makes three primary claims: 4GW advocates' boxing of history into ‘generations’ is logically and temporally inconsistent; 4GW authors misuse history by selectively choosing case studies and applying them out of context; and other arguments regarding

Timothy J. Junio

2009-01-01

162

Vocabulary Strategies for a Fourth Grade Classroom  

ERIC Educational Resources Information Center

For this project I worked with twelve of my fourth grade students from a local school in the southwestern part of Stokes County, North Carolina on increasing their vocabulary skills through the development and implementation of seven vocabulary strategies. During the Literature Review I came across the following seven strategies: Prediction;…

Howell, Gina

2012-01-01

163

Singapore: The Fourth Way in Action?  

ERIC Educational Resources Information Center

This article has two main objectives. It first outlines the first three waves of change termed by Hargreaves and Shirley (The Fourth Way: The inspiring future for educational change. Thousand Oaks, CA: Corwin Press, "2009") as the First, Second and Third Way that defined global educational policy and practice since the 1960s. It then introduces…

Hargreaves, Andy

2012-01-01

164

High Energy Neutrinos with a Mediterranean Neutrino Telescope  

SciTech Connect

The high energy neutrino detection by a km{sup 3} Neutrino Telescope placed in the Mediterranean sea provides a unique tool to both determine the diffuse astrophysical neutrino flux and the neutrino nucleon cross section in the extreme kinematical region, which could unveil the presence of new physics. Here is performed a brief analysis of possible NEMO site performances.

Borriello, E.; /Naples U. /INFN, Naples /Valencia U., IFIC; Cuoco, A.; /Aarhus U.; Mangano, G.; /Naples U. /INFN, Naples; Miele, G.; /Naples U. /INFN, Naples /Valencia U.,; Pastor, Sergio; /Valencia U., IFIC; Pisanti, O.; /Naples U. /INFN, Naples; Serpico, Pasquale Dario; /Fermilab

2007-09-01

165

Neutrino oscillations in the early Universe with nonequilibrium neutrino distributions  

NASA Astrophysics Data System (ADS)

Around one second after the big bang, neutrino decoupling and e+-e- annihilation distorted the Fermi-Dirac spectrum of neutrino energies. Assuming neutrinos have masses and can mix, we compute the distortions using nonequilibrium thermodynamics and the Boltzmann equation. The flavor behavior of neutrinos is studied during and following the generation of the distortion.

Kostelecký, V. Alan; Samuel, Stuart

1995-09-01

166

GENIUS Project, Neutrino Oscillations and Cosmology: Neutrinos Reveal Their Nature?  

NASA Astrophysics Data System (ADS)

The neutrinoless double beta decay as well as any other laboratory experiment has not been able to answer the question of the neutrino's nature. Hints on the answer are available when neutrino oscillations and ( ? ? )0 ? are considered simultaneously. In this case phenomenologically interesting neutrino mass schemes can lead to non-vanishing and large values of < m? >. As a consequence, some schemes with Majorana neutrinos can be ruled out even now. If we assume that in addition neutrinos contribute to Hot Dark Matter then the window for Majorana neutrinos is even more restricted, e.g. GENIUS experiment will be sensitive to scenarios with three Majorana neutrinos.

Czakon, M.; Studnik, J.; Zralek, M.; Gluza, J.

2000-06-01

167

Families at Work: Strengths and Strains. The General Mills American Family Report 1980-81.  

ERIC Educational Resources Information Center

Fourth in a series of studies on the American family conducted for General Mills Corporation, this publication provides findings from a survey exploring the relationship between work and the family in contemporary society. Specifically, the survey explores how changes in the work force, especially the increase in numbers of working wives and…

General Mills, Inc., Minneapolis, Minn.

168

Reactor Monitoring with Neutrinos  

E-print Network

The fundamental knowledge on neutrinos acquired in the recent years open the possibility of applied neutrino physics. Among it the automatic and non intrusive monitoring of nuclear reactor by its antineutrino signal could be very valuable to IAEA in charge of the control of nuclear power plants. Several efforts worldwide have already started.

M. Cribier

2007-04-06

169

Monte Carlo Neutrino Oscillations  

E-print Network

We demonstrate that the effects of matter upon neutrino propagation may be recast as the scattering of the initial neutrino wavefunction. Exchanging the differential, Schrodinger equation for an integral equation for the scattering matrix S permits a Monte Carlo method for the computation of S that removes many of the numerical difficulties associated with direct integration techniques.

James P. Kneller; Gail C. McLaughlin

2005-09-29

170

The Sudbury Neutrino Observatory  

Microsoft Academic Search

The Sudbury Neutrino Observatory is a 1000 tonne heavy water Cerenkov detector built to observe neutrinos from the sun and from supernovae. It is located deep underground to reduce the cosmic background radiation to negligible levels. The observatory is nearing completion and will commence full data taking early in 1999. Some aspects of its design and construction, and some of

R. L. Helmer; R. L. Hahn; J. K. Rowley; A. L. Carter; B. Hollebone; D. Kessler; I. Blevis; F. Dalnoki-Veress; A. DeKok; J. Farine; D. R. Grant; C. K. Hargrove; G. Laberge; I. Levine; K. McFarlane; H. Mes; A. T. Noble; V. M. Novikov; M. O'Neill; M. Shatkay; C. Shewchuk; D. Sinclair; E. T. H. Clifford; R. Deal; E. D. Earle; E. Gaudette; G. Milton; B. Sur; J. Bigu; J. H. M. Cowan; D. L. Cluff; E. D. Hallman; R. U. Haq; J. Hewett; J. G. Hykawy; G. Jonkmans; R. Michaud; A. Roberge; J. Roberts; E. Saettler; M. H. Schwendener; H. Seifert; D. Sweezey; R. Tafirout; C. J. Virtue; D. N. Beck; Y. D. Chan; X. Chen; M. R. Dragowsky; F. W. Dycus; J. Gonzalez; M. C. P. Isaac; Y. Kajiyama; G. W. Koehler; K. T. Lesko; M. C. Moebus; E. B. Norman; C. E. Okada; A. W. P. Poon; P. Purgalis; A. Schuelke; A. R. Smith; R. G. Stokstad; S. Turner; I. Zlimen; J. M. Anaya; T. J. Bowles; S. J. Brice; E.-I. Esch; M. M. Fowler; A. Goldschmidt; A. Hime; A. F. McGirt; G. G. Miller; W. A. Teasdale; J. B. Wilhelmy; J. M. Wouters; J. D. Anglin; M. Bercovitch; W. F. Davidson; R. S. Storey; S. Biller; R. A. Black; R. J. Boardman; M. G. Bowler; J. Cameron; B. Cleveland; A. P. Ferraris; G. Doucas; H. Heron; C. Howard; N. A. Jelley; A. B. Knox; M. Lay; W. Locke; J. Lyon; S. Majerus; M. Moorhead; M. Omori; N. W. Tanner; R. K. Taplin; M. Thorman; D. L. Wark; J. C. Barton; P. T. Trent; R. Kouzes; M. M. Lowry; A. L. Bell; E. Bonvin; M. Boulay; M. Dayon; F. Duncan; L. S. Erhardt; H. C. Evans; G. T. Ewan; R. Ford; A. Hallin; A. Hamer; P. M. Hart; P. J. Harvey; D. Haslip; C. A. W. Hearns; R. Heaton; J. D. Hepburn; C. J. Jillings; E. P. Korpach; H. W. Lee; J. R. Leslie; M.-Q. Liu; H. B. Mak; A. B. McDonald; J. D. MacArthur; W. McLatchie; B. A. Moffat; S. Noel; T. J. Radcliffe; B. C. Robertson; P. Skensved; R. L. Stevenson; X. Zhu; S. Gil; J. Heise; R. J. Komar; C. W. Nally; H. S. Ng; C. E. Waltham; R. C. Allen; G. Bühler; H. H. Chen; G. Aardsma; T. Andersen; K. Cameron; M. C. Chon; R. H. Hanson; P. Jagam; J. Karn; J. Law; R. W. Ollerhead; J. J. Simpson; N. Tagg; J.-X. Wang; C. Alexander; E. W. Beier; J. C. Cook; D. F. Cowen; E. D. Frank; W. Frati; P. T. Keener; J. R. Klein; G. Mayers; D. S. McDonald; M. S. Neubauer; F. M. Newcomer; R. J. Pearce; R. G. V. de Water; R. V. Berg; P. Wittich; Q. R. Ahmad; J. M. Beck; M. C. Browne; T. H. Burritt; P. J. Doe; C. A. Duba; S. R. Elliott; J. E. Franklin; J. V. Germani; P. Green; A. A. Hamian; K. M. Heeger; M. Howe; R. M. Drees; A. Myers; R. G. H. Robertson; M. W. E. Smith; T. D. Steiger; T. V. Wechel; J. F. Wilkerson

2000-01-01

171

Neutrino 2012: Outlook - theory  

E-print Network

Ongoing developments in theory and phenomenology are related to the measured large value of 1-3 mixing and indications of significant deviation of the 2-3 mixing from maximal one. "Race" for the mass hierarchy has started and there is good chance that multi-megaton scale atmospheric neutrino detectors with low threshold (e.g. PINGU) will establish the type of hierarchy. Two IceCube candidates of the PeV cosmic neutrinos if confirmed, is the beginning of new era of high energy neutrino astronomy. Accumulation of data on solar neutrinos (energy spectrum, D-N asymmetry, value of $\\Delta m^2_{21}$) may uncover some new physics. The Tri-bimaximal mixing is disfavored and the existing discrete symmetry paradigm may change. The confirmed QLC prediction, $\\theta_{13} \\approx \\theta_{C}/\\sqrt{2}$, testifies for GUT, seesaw and some symmetry at very high scales. However, the same value of 1-3 mixing can be obtained in various ways which have different implications. The situation in lepton sector changes from special (with specific neutrino symmetries, etc.) to normal, closer to that in the quark sector. Sterile neutrinos are challenge for neutrino physics but also opportunity with many interesting phenomenological consequences. Further studies of possible connections between neutrinos and the dark sector of the Universe may lead to breakthrough both in particle physics and cosmology.

A. Yu. Smirnov

2012-10-15

172

Neutrino 2012: Outlook - theory  

NASA Astrophysics Data System (ADS)

Ongoing developments in theory and phenomenology are related to the measured large value of 1-3 mixing and indications of significant deviation of the 2-3 mixing from maximal one. "Race" for the mass hierarchy has started and there is good chance that multi-megaton scale atmospheric neutrino detectors with low threshold (e.g. PINGU) will establish the type of hierarchy. Two IceCube candidates of the PeV cosmic neutrinos if confirmed, is the beginning of new era of high energy neutrino astronomy. Accumulation of data on solar neutrinos (energy spectrum, D-N asymmetry, value of ?m212) may uncover some new physics. The Tri-bimaximal mixing is disfavored and the existing discrete symmetry paradigm may change. The confirmed QLC prediction, ?13??C/?{2}, testifies for GUT, seesaw and some symmetry at very high scales. However, the same value of 1-3 mixing can be obtained in various ways which have different implications. The situation in lepton sector changes from special (with specific neutrino symmetries, etc.) to normal, closer to that in the quark sector. Sterile neutrinos are challenge for neutrino physics but also opportunity with many interesting phenomenological consequences. Further studies of possible connections between neutrinos and the dark sector of the Universe may lead to breakthrough both in particle physics and cosmology.

Smirnov, A. Yu.

2013-02-01

173

Physics and Astrophysics of Neutrinos  

Microsoft Academic Search

Observations of neutrinos being emitted by the supernova SN1987A, star neutrinos, and atmospheric neutrinos by means of underground detectors have provided new insights into astronomy. These observations have brought to light new unresolved phenomena such as the solar neutrino problem, spurring investigative studies among particle physicists and astrophysicists. Today, intense interaction and continual cooperation between specialists in the field of

Masataka Fukugita; Atsuto Suzuki

1994-01-01

174

Neutrino assisted gauge mediation  

NASA Astrophysics Data System (ADS)

Recent observation shows that the Higgs mass is at around 125 GeV while the prediction of the minimal supersymmetric standard model is below 120 GeV for stop mass lighter than 2 TeV unless the top squark has a maximal mixing. We consider the right-handed neutrino supermultiplets as messengers in addition to the usual gauge mediation to obtain sizeable trilinear soft parameters A t needed for the maximal stop mixing. Neutrino messengers can explain the observed Higgs mass for stop mass around 1 TeV. Neutrino assistance can also generate charged lepton flavor violation including ?? e? as a possible signature of the neutrino messengers. We consider the S 4 discrete flavor model and show the relation of the charged lepton flavor violation, ? 13 of neutrino oscillation and the muon's g-2.

Kim, Hyung Do; Mo, Doh Young; Seo, Min-Seok

2013-06-01

175

Solar neutrinos: Probing the sun or neutrinos  

SciTech Connect

The decade of the 1990's should prove to be a landmark period for the study of solar neutrino physics. Current observations show 2-3 times fewer neutrinos coming from the sun than are theoretically expected. As we enter the decade, new experiments are poised to attempt and discover whether this deficit is a problem with our understanding of how the sun works, is a hint of new neutrino properties beyond those predicted by the standard model of particle physics, or perhaps a combination of both. This paper will review the current status of the field and point out how future measurements should help solve this interesting puzzle. 11 refs., 3 figs., 1 tab.

Wilkerson, J.F.

1991-01-01

176

Coherent scattering of cosmic neutrinos  

NASA Technical Reports Server (NTRS)

It is shown that cosmic neutrino scattering can be non-negligible when coherence effects previously neglected are taken into account. The coherent neutrino scattering cross section is derived and the neutrino index of refraction evaluated. As an example of coherent neutrino scattering, a detector using critical reflection is described which in principle can detect the low energy cosmic neutrino background allowed by the measured cosmological red shift.

Opher, R.

1974-01-01

177

Topics in neutrino and gravitational astrophysics  

NASA Astrophysics Data System (ADS)

A wide range of astrophysical phenomena are significantly influenced by weak interaction processes that involve the emission or absorption of neutrinos in matter at high density and/or temperature. Examples include red giant stars, white dwarfs, neutron stars, type la and type II (core-collapse) supernovae, and accretion disks of gamma-ray bursters. Depending on the density and temperature of ambient matter, the emission of neutrinos is an important energy-loss mechanism, whereas their scattering and absorption serve to deposit energy into matter. Detailed neutrino transport in such environments is described by the Boltzmann transport equation; its solution requires the corresponding kernels in the source term. In this work the neutrino production and absorption kernels for the plasma and photo neutrino processes together with their differential and total rates are derived. Full information about the emitted neutrinos was retained by evaluating the squared matrix elements for this process which was hitherto bypassed in obtaining the total neutrino emissivities. Numerical results for various temperatures and densities are provided. Approximate analytical results helpful in understanding the qualitative behaviors in limiting situations are also given. Binary mergers involving black holes and neutron stars have been proposed as major sources of gravitational waves, r-process nucleosynthesis, and gamma ray bursters. In addition, they represent an important observable that could distinguish between normal and self-bound neutron stars. These two families of stars have distinctly different mass-radius relationships resulting from their equations of state. We show how these differences are revealed during their mergers. Our analysis is performed at increasing levels of approximation for the gravitational potential: (i) Newtonian potential, (ii) pseudo-GR potentials, and (iii) the second order post-Newtonian analysis. These potentials are employed to study both the evolution of the binary and to describe the Roche lobe geometry that determines when and if mass transfer between the components begins. The Roche lobe problem with any pseudo-relativistic or post-Newtonian potential has not heretofore been considered. Our findings indicate possibly detectable differences between the two families of stars. The imprint of microphysics on the frequency and the amplitude of their gravitational signature is persistent and reveals a strong contrast between them.

Ratkovic, Sasa

178

Familial idiopathic cerebral calcifications.  

PubMed Central

Nine members of a family spanning three generations showed bilateral calcifications of the basal ganglia with autosomal dominant inheritance. Two members developed chorea, dementia, and a characteristic speech disturbance (palialalia) in the third or fourth decade. A third member possibly shows the initial stage of a similar syndrome. Six members with calcifications but without neurological signs are younger than 25 years. All nine patients had normal calcium and phosphorus, and no evidence of endocrinological or somatic abnormalities. Thie 'isiopathic' picture must be differentiated from hypoparathyroidism and pseudohypoparathyroidism. Images PMID:886353

Boller, F; Boller, M; Gilbert, J

1977-01-01

179

7 CFR 51.2296 - Three-fourths half kernel.  

Code of Federal Regulations, 2012 CFR

...FRUITS, VEGETABLES AND OTHER PRODUCTS 1,2 (INSPECTION, CERTIFICATION, AND STANDARDS) United States Standards for Shelled English Walnuts (Juglans Regia) Definitions § 51.2296 Three-fourths half kernel. Three-fourths half kernel...

2012-01-01

180

7 CFR 51.2296 - Three-fourths half kernel.  

Code of Federal Regulations, 2013 CFR

...FRUITS, VEGETABLES AND OTHER PRODUCTS 1,2 (INSPECTION, CERTIFICATION, AND STANDARDS) United States Standards for Shelled English Walnuts (Juglans Regia) Definitions § 51.2296 Three-fourths half kernel. Three-fourths half kernel...

2013-01-01

181

7 CFR 51.2296 - Three-fourths half kernel.  

Code of Federal Regulations, 2014 CFR

...FRUITS, VEGETABLES AND OTHER PRODUCTS 1 2 (INSPECTION, CERTIFICATION, AND STANDARDS) United States Standards for Shelled English Walnuts (Juglans Regia) Definitions § 51.2296 Three-fourths half kernel. Three-fourths half kernel...

2014-01-01

182

7 CFR 51.2296 - Three-fourths half kernel.  

Code of Federal Regulations, 2011 CFR

...FRUITS, VEGETABLES AND OTHER PRODUCTS 1,2 (INSPECTION, CERTIFICATION, AND STANDARDS) United States Standards for Shelled English Walnuts (Juglans Regia) Definitions § 51.2296 Three-fourths half kernel. Three-fourths half kernel...

2011-01-01

183

7 CFR 51.2296 - Three-fourths half kernel.  

Code of Federal Regulations, 2010 CFR

...FRUITS, VEGETABLES AND OTHER PRODUCTS 1,2 (INSPECTION, CERTIFICATION, AND STANDARDS) United States Standards for Shelled English Walnuts (Juglans Regia) Definitions § 51.2296 Three-fourths half kernel. Three-fourths half kernel...

2010-01-01

184

The Frobenius group T13 and the canonical see-saw mechanism applied to neutrino mixing  

E-print Network

The compatibility of the Frobenius group T13 with the canonical see-saw mechanism of neutrino mixing is examined. The Standard Model is extended in a minimalist way, by introducing a family symmetry and three right-handed neutrinos. To fit experiments and place constraints on the possibilities, tribimaximal mixing is used as a guideline. The application of both a family symmetry group and the canonical see-saw mechanism naturally generates small neutrino masses. The various possibilities from combining these two models are listed. Enough constraints are produced to narrow down the parameters of the neutrino mass matrix to two. This is therefore a predictive model where neutrino mass eigenvalues and allowed regions for neutrinoless double beta decay are suggested.

Christine Hartmann

2011-09-23

185

Documentation of the Fourth Order Band Model  

NASA Technical Reports Server (NTRS)

A general circulation model is presented which uses quadratically conservative, fourth order horizontal space differences on an unstaggered grid and second order vertical space differences with a forward-backward or a smooth leap frog time scheme to solve the primitive equations of motion. The dynamic equations for motion, finite difference equations, a discussion of the structure and flow chart of the program code, a program listing, and three relevent papers are given.

Kalnay-Rivas, E.; Hoitsma, D.

1979-01-01

186

Fourth NASA Langley Formal Methods Workshop  

NASA Technical Reports Server (NTRS)

This publication consists of papers presented at NASA Langley Research Center's fourth workshop on the application of formal methods to the design and verification of life-critical systems. Topic considered include: Proving properties of accident; modeling and validating SAFER in VDM-SL; requirement analysis of real-time control systems using PVS; a tabular language for system design; automated deductive verification of parallel systems. Also included is a fundamental hardware design in PVS.

Holloway, C. Michael (Compiler); Hayhurst, Kelly J. (Compiler)

1997-01-01

187

Laboratory development of fourth generation sulphlex binders  

E-print Network

. In this direction, previous blends of sulfur modified with polymers have found to have certain drawbacks which the current research hopes to eliminate. The fourth generation of Sulphlex binders will be developed by taking a careful look at previous blends... and varying the proportions of sulfur and the modifiers. Several areas of concern that were identified in the previous blends would be probed into and alleviated through a comprehensive binder and mixture testing program aimed at producing an improved blend...

Menon, Vivek Narayan

1994-01-01

188

Fourth High Alpha Conference, volume 1  

NASA Technical Reports Server (NTRS)

The goal of the Fourth High Alpha Conference was to focus on the flight validation of high angle-of-attack technologies and provide an in-depth review of the latest high angle-of-attack activities. Areas that were covered include: high angle-of-attack aerodynamics, propulsion and inlet dynamics, thrust vectoring, control laws and handling qualities, tactical utility, and forebody controls.

1994-01-01

189

Ecological, Psychological, and Cognitive Components of Reading Difficulties: Testing the Component Model of Reading in Fourth Graders across 38 Countries  

ERIC Educational Resources Information Center

The authors tested the component model of reading (CMR) among 186,725 fourth grade students from 38 countries (45 regions) on five continents by analyzing the 2006 Progress in International Reading Literacy Study data using measures of ecological (country, family, school, teacher), psychological, and cognitive components. More than 91% of the…

Chiu, Ming Ming; McBride-Chang, Catherine; Lin, Dan

2012-01-01

190

Topics in neutrino astrophysics  

NASA Astrophysics Data System (ADS)

In this thesis, we investigate observable consequences of active and sterile neutrinos, in galactic, cluster, and cosmological scales. We assume that sterile neutrinos with masses of order 10's eV, 10's keV, and MeV were formed by oscillation of active neutrinos in the early universe. If sterile neutrinos with mass ~ 30 eV exist, they affect the structure of galaxies and explain the flatness of their rotation curves. Also, the existence of decaying sterile neutrinos with mass 16 -- 18 keV and decay rate G = (5 ± 1) × 10^-17 s -1 can simultaneously be the cause of heating at the Milky Way center, the supermassive blackhole mass and velocity dispersion relation, the lack of cooling flow in clusters, and reionization in the universe. Lastly, we make of the observed 511 keV annihilation flux line at the Milky Way center to constrain properties of sterile neutrinos of MeV mass scale. We also derive a relation among several cluster observables assuming the existence of an active neutrino halo, which agrees with the observational data in 103 clusters.

Chan, Man Ho

2009-06-01

191

Fourth order difference methods for hyperbolic IBVP's  

NASA Technical Reports Server (NTRS)

Fourth order difference approximations of initial-boundary value problems for hyperbolic partial differential equations are considered. We use the method of lines approach with both explicit and compact implicit difference operators in space. The explicit operator satisfies an energy estimate leading to strict stability. For the implicit operator we develop boundary conditions and give a complete proof of strong stability using the Laplace transform technique. We also present numerical experiments for the linear advection equation and Burgers' equation with discontinuities in the solution or in its derivative. The first equation is used for modeling contact discontinuities in fluid dynamics, the second one for modeling shocks and rarefaction waves. The time discretization is done with a third order Runge-Kutta TVD method. For solutions with discontinuities in the solution itself we add a filter based on second order viscosity. In case of the non-linear Burger's equation we use a flux splitting technique that results in an energy estimate for certain different approximations, in which case also an entropy condition is fulfilled. In particular we shall demonstrate that the unsplit conservative form produces a non-physical shock instead of the physically correct rarefaction wave. In the numerical experiments we compare our fourth order methods with a standard second order one and with a third order TVD-method. The results show that the fourth order methods are the only ones that give good results for all the considered test problems.

Gustafsson, Bertil; Olsson, Pelle

1994-01-01

192

Superheavy sterile neutrinos as dark matter  

E-print Network

neutrinos as a dark matter candidate, produced through MSW conversion of active neutrinos. Recently Allen proposed a different nonthermal mechanism for the production of superheavy sterile neutrinos. Such neutrinos are predicted by an SO(10) grand...

Tang, Yongjun

2012-06-07

193

Solar mass-varying neutrino oscillations  

E-print Network

We propose that the solar neutrino deficit may be due to oscillations of mass-varying neutrinos (MaVaNs). This scenario elucidates solar neutrino data beautifully while remaining comfortably compatible with atmospheric neutrino and K2K data...

Marfatia, Danny; Huber, P.; Barger, V.

2005-11-18

194

Neutrinos from neutron stars  

NASA Technical Reports Server (NTRS)

A calculation of the flux of ultra-high energy neutrinos from galactic neutron stars is presented. The calculation is used to determine the number of point sources detectable at the sensitivity threshold of a proposed deep underwater muon and neutrino detector array. The detector array would have a point source detection threshold of about 100 eV/sq cm-sec. Analysis of neutrino luminosities and the number of detectable sources suggests that the deep underwater detector may make a few discoveries. In particular, a suspected neutron star in the Cyg X-3 source seems a promising target for the deep underwater array.

Helfand, D. J.

1979-01-01

195

Neutrinos: Nature's Identity Thieves?  

SciTech Connect

The oscillation of neutrinos from one variety to another has long been suspected, but was confirmed only about 15 years ago. In order for these oscillations to occur, neutrinos must have a mass, no matter how slight. Since neutrinos have long been thought to be massless, in a very real way, this phenomena is a clear signal of physics beyond the known. In this video, Fermilab's Dr Don Lincoln explains how we know it occurs and hints at the rich experimental program at several international laboratories designed to understand this complex mystery.

Lincoln, Don

2013-07-11

196

Submarine neutrino communication  

E-print Network

We discuss the possibility to use a high energy neutrino beam from a muon storage ring to provide one way communication with a submerged submarine. Neutrino interactions produce muons which can be detected either, directly when they pass through the submarine or by their emission of Cerenkov light in sea water, which, in turn, can be exploited with sensitive photo detectors. Due to the very high neutrino flux from a muon storage ring, it is sufficient to mount either detection system directly onto the hull of the submersible. The achievable data transfer rates compare favorable with existing technologies and do allow for a communication at the usual speed and depth of submarines.

Patrick Huber

2010-08-20

197

Submarine neutrino communication  

E-print Network

We discuss the possibility to use a high energy neutrino beam from a muon storage ring to provide one way communication with a submerged submarine. Neutrino interactions produce muons which can be detected either, directly when they pass through the submarine or by their emission of Cerenkov light in sea water, which, in turn, can be exploited with sensitive photo detectors. Due to the very high neutrino flux from a muon storage ring, it is sufficient to mount either detection system directly onto the hull of the submersible. The achievable data transfer rates compare favorable with existing technologies and do allow for a communication at the usual speed and depth of submarines.

Huber, Patrick

2009-01-01

198

Neutrinos: Nature's Identity Thieves?  

ScienceCinema

The oscillation of neutrinos from one variety to another has long been suspected, but was confirmed only about 15 years ago. In order for these oscillations to occur, neutrinos must have a mass, no matter how slight. Since neutrinos have long been thought to be massless, in a very real way, this phenomena is a clear signal of physics beyond the known. In this video, Fermilab's Dr Don Lincoln explains how we know it occurs and hints at the rich experimental program at several international laboratories designed to understand this complex mystery.

Lincoln, Don

2014-08-07

199

Formation of neutrino halos  

NASA Astrophysics Data System (ADS)

A fully general relativistic nonlinear model of the formation of massive neutrino halos in an Einstein-Straus universe was given by Fabbri, Jantzen and Ruffini (1982). The paper considers the role which a nonvanishing, repulsive cosmological constant Lambda greater than 0, admissible by observational limits, can have in the FJR model. The main conclusion is that the influence of Lambda is negligible in the FJR model for massive neutrinos with mass of about 10 eV, indicated by recent observations of SN 1987a. On the other hand, the cosmological constant is relevant in the model, if neutrinos have low mass, less than 0.2 eV.

Stuchlik, Zdenek

200

Neutrinos: Nature's Identity Thieves?  

ScienceCinema

The oscillation of neutrinos from one variety to another has long been suspected, but was confirmed only about 15 years ago. In order for these oscillations to occur, neutrinos must have a mass, no matter how slight. Since neutrinos have long been thought to be massless, in a very real way, this phenomena is a clear signal of physics beyond the known. In this video, Fermilab's Dr Don Lincoln explains how we know it occurs and hints at the rich experimental program at several international laboratories designed to understand this complex mystery.

Dr. Don Lincoln

2013-07-22

201

Solar-neutrino oscillations  

NASA Technical Reports Server (NTRS)

The theory of oscillations of solar neutrinos is developed as it applies to the electron-recoil spectrum in neutrino-electron scattering. The spectral information obtained by such measurements (as opposed to counting total event rates) is crucial for allowing observation of neutrino oscillations for masses down to 500 neV. In this regard, the effects of different masses and mixing angles, as well as such subtleties as thermal and pressure broadening, finite solar-core size, and variable indices of refraction are investigated.

Krauss, L.; Wilczek, F.

1985-01-01

202

Neutrino time travel  

E-print Network

We discuss causality properties of extra-dimensional theories allowing for effectively superluminal bulk shortcuts. Such shortcuts for sterile neutrinos have been discussed as a solution to the puzzling LSND and MiniBooNE neutrino oscillation results. We focus here on the sub-category of asymmetrically warped brane spacetimes and argue that scenarios with two extra dimensions may allow for timelike curves which can be closed via paths in the extra-dimensional bulk. In principle sterile neutrinos propagating in the extra dimension may be manipulated in a way to test the chronology protection conjecture experimentally.

James Dent; Heinrich Päs; Sandip Pakvasa; Thomas J. Weiler

2007-10-12

203

Atmospheric neutrino oscillations and tau neutrinos in ice  

SciTech Connect

The main goal of the IceCube Deep Core Array is to search for neutrinos of astrophysical origins. Atmospheric neutrinos are commonly considered as a background for these searches. We show here that cascade measurements in the Ice Cube Deep Core Array can provide strong evidence for tau neutrino appearance in atmospheric neutrino oscillations. Controlling systematic uncertainties will be the limiting factor in the analysis. A careful study of these tau neutrinos is crucial, since they constitute an irreducible background for astrophysical neutrino detection.

Giordano, Gerardo; Mocioiu, Irina [Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802 (United States); Mena, Olga [Instituto de Fisica Corpuscular, IFIC, CSIC and Universidad de Valencia (Spain)

2010-06-01

204

Sterile neutrinos: Phenomenology and theory  

NASA Astrophysics Data System (ADS)

A simultaneous understanding of the results of the LSND experiment indicating ??-?e oscillation together with other evidences for neutrino oscillations from solar and atmospheric neutrino data seems to require the existence of at least one sterile neutrino. One can also give other plausible astrophysical arguments that seem to require light sterile neutrinos. If such sterile neutrinos exist, a major theoretical challenge is to understand why they are so light. A scenario for the light sterile neutrino is presented where one assumes a parity doubling of the standard model with identical matter and gauge content. The neutrinos of the parity doubled (mirror) sector are light for the same reason that the known neutrinos are light and since they do not couple to the known W and Z bosons, they can be identified with the sterile neutrinos. Some of the implications and possible tests of this hypothesis are mentioned.

Mohapatra, Rabindra N.

1999-07-01

205

Overview of Neutrino Mixing Models and Their Mixing Angle Predictions  

E-print Network

An overview of neutrino-mixing models is presented with emphasis on the types of horizontal flavor and vertical family symmetries that have been invoked. Distributions for the mixing angles of many models are displayed. Ways to differentiate among the models and to narrow the list of viable models are discussed.

Carl H. Albright

2009-11-12

206

The Science of NOA Neutrinos are everywhere!  

E-print Network

The Science of NOA Neutrinos are everywhere! Neutrinos are among the most abundant particles. Unimaginably large numbers of neutrinos from the first moments of the universe are still present today. Neutrinos help to shape our universe Nuclear reactions make the sun shine, producing neutrinos. Neutrinos

Quigg, Chris

207

Detecting the Neutrino  

NASA Astrophysics Data System (ADS)

In 1930 Wolfgang Pauli suggested that a new particle might be required to make sense of the radioactive-disintegration mode known as beta decay. This conjecture initially seemed impossible to verify since the new particle, which became known as the neutrino, was uncharged, had zero or small mass, and interacted only insignificantly with other matter. In 1951 Frederick Reines and Clyde L. Cowan, Jr., of the Los Alamos Scientific Laboratory undertook the difficult task of detecting the free neutrino by observing its inverse beta-decay interaction with matter. They succeeded in 1956. The neutrino was accepted rapidly as a fundamental particle despite discrepancies in reported details of the experiments and despite the absence of independent verification of the result. This paper describes the experiments, examines the nature of the discrepancies, and discusses the circumstances of the acceptance of the neutrino's detection by the physics community.

Arns, Robert G.

208

Phenomenology of Neutrino Oscillations  

E-print Network

The phenomenology of solar, atmospheric, supernova and laboratory neutrino oscillations is described. Analytical formulae for matter effects are reviewed. The results from oscillations are confronted with neutrinoless double beta decay.

G. Rajasekaran

2000-04-17

209

Recent advances in neutrino astrophysics  

E-print Network

Neutrinos are produced by a variety of sources that comprise our Sun, explosive environments such as core-collapse supernovae, the Earth and the Early Universe. The precise origin of the recently discovered ultra-high energy neutrinos is to be determined yet. These weakly interacting particles give us information on their sources, although the neutrino fluxes can be modified when neutrinos traverse an astrophysical environment. Here we highlight recent advances in neutrino astrophysics and emphasise the important progress in our understanding of neutrino flavour conversion in media.

Cristina Volpe

2014-11-24

210

Experimental High Energy Neutrino Astrophysics  

SciTech Connect

Neutrinos are considered promising probes for high energy astrophysics. More than four decades after deep water Cerenkov technique was proposed to detect high energy neutrinos. Two detectors of this type are successfully taking data: BAIKAL and AMANDA. They have demonstrated the feasibility of the high energy neutrino detection and have set first constraints on TeV neutrino production astrophysical models. The quest for the construction of km3 size detectors have already started: in the South Pole, the IceCube neutrino telescope is under construction; the ANTARES, NEMO and NESTOR Collaborations are working towards the installation of a neutrino telescope in the Mediterranean Sea.

Distefano, Carla [Laboratori Nazionali del Sud, Catania (Italy)

2005-10-12

211

Neutrino Detectors: Challenges and Opportunities  

SciTech Connect

This paper covers possible detector options suitable at future neutrino facilities, such as Neutrino Factories, Super Beams and Beta Beams. The Magnetised Iron Neutrino Detector (MIND), which is the baseline detector at a Neutrino Factory, will be described and a new analysis which improves the efficiency of this detector at low energies will be shown. Other detectors covered include the Totally Active Scintillating Detectors (TASD), particularly relevant for a low energy Neutrino Factory, emulsion detectors for tau detection, liquid argon detectors and megaton scale water Cherenkov detectors. Finally the requirements of near detectors for long-baseline neutrino experiments will be demonstrated.

Soler, F. J. P. [School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ (United Kingdom)

2011-10-06

212

Neutrinos beyond the Standard Model  

SciTech Connect

I review some basic aspects of neutrino physics beyond the Standard Model such as neutrino mixing and neutrino non-orthogonality, universality and CP violation in the lepton sector, total lepton number and lepton flavor violation, etc.. These may lead to neutrino decays and oscillations, exotic weak decay processes, neutrinoless double /beta/ decay, etc.. Particle physics models are discussed where some of these processes can be sizable even in the absence of measurable neutrino masses. These may also substantially affect the propagation properties of solar and astrophysical neutrinos. 39 refs., 4 figs.

Valle, J.W.F.

1989-08-01

213

Helicity of Neutrinos  

Microsoft Academic Search

A combined analysis of circular polarization and resonant scattering of ; gamma rays following orbital electron capture measures the helicity of the ; neutrino. A measurement was carried out with Eu¹⁵² which decays by orbital ; electron capture. Assuming the most plausible spin-parity for this isomer ; compatible with its decay scheme, 0-1, it was found that the neutrino was

M. Goldhaber; L. Grodzins; A. W. Sunyar

1958-01-01

214

The Sudbury Neutrino Observatory  

Microsoft Academic Search

Two experiments now in progress have reported measurements of the flux of high energy neutrinos from the Sun. Since about 1970, Davis and his co-workers have been using a [sup 37]Cl-based detector to measure the [sup 7]Be and [sup 8]B solar neutrino flux and have found it to be at least a factor of three lower than that predicted by

E. B. Norman; Y. D. Chan; A. Garcia; K. T. Lesko; A. R. Smith; R. G. Stokstad; I. Zlimen; H. C. Evans; G. T. Ewan; A. Hallin; H. W. Lee; J. R. Leslie; J. D. MacArthur; H. B. Mak; A. B. McDonald; W. McLatchie; B. C. Robertson; P. Skensved; B. Sur; E. Bonvin; E. D. Earle; D. Hepburn; G. M. Milton

1992-01-01

215

Supernova neutrino detection  

E-print Network

The gravitational core collapse of a star produces a huge burst of neutrinos of all flavors. A number of detectors worldwide are sensitive to such a burst; its detection would yield information about both particle physics and astrophysics. Sensitivity to all flavors, and ability to tag different interactions, will be key for extraction of information. Here I will survey the capabilities of current and future detectors for detection of supernova neutrinos from the Milky Way and beyond.

K. Scholberg

2007-01-04

216

The Highest Energy Neutrinos  

E-print Network

Measurements of the arrival directions of cosmic rays have not revealed their sources. High energy neutrino telescopes attempt to resolve the problem by detecting neutrinos whose directions are not scrambled by magnetic fields. The key issue is whether the neutrino flux produced in cosmic ray accelerators is detectable. It is believed that the answer is affirmative, both for the galactic and extragalactic sources, provided the detector has kilometer-scale dimensions. We revisit the case for kilometer-scale neutrino detectors in a model-independent way by focussing on the energetics of the sources. The real breakthrough though has not been on the theory but on the technology front: the considerable technical hurdles to build such detectors have been overcome. Where extragalactic cosmic rays are concerned an alternative method to probe the accelerators consists in studying the arrival directions of neutrinos produced in interactions with the microwave background near the source, i.e. within a GZK radius. Their flux is calculable within large ambiguities but, in any case, low. It is therefore likely that detectors that are larger yet by several orders of magnitudes are required. These exploit novel techniques, such as detecting the secondary radiation at radio wavelengths emitted by neutrino induced showers.

Francis Halzen

2007-10-22

217

Envelope instability and the fourth order resonance  

NASA Astrophysics Data System (ADS)

The well-known envelope instability or the second order even collective mode [I. Hofmann, Phys. Rev. E 57, 4 (1998)] and the fourth order resonance 4 ? =360 ° due to the nonlinear space charge effect in high intensity beams have been studied previously. A wide stop band around 15° is found in a pure periodic focusing channel. In addition, it is illustrated that the fourth order resonance dominates over the envelope instability and practically replaces it in the stop band [D. Jeon et al., Phys. Rev. ST Accel. Beams 12, 054204 (2009)]. In this paper, for a continuous beam with remarkable space charge, our 2D self-consistent particle-in-cell simulation work with the code topopic shows these two kinds of effects respectively in a periodic focusing defocusing (FD) channel. For a fixed tune depression ? =0.8 , a stop band with a width of almost 15° is also demonstrated. Moreover, it is confirmed that analytical results of the rms envelope instability diagram are a valid tool to interpret the width of the stop band. Emittance growth rates in stop band are also well explained. It is found that, for a nearly rms matched beam, the emittance growth in the stop band is almost proportional to the saturation time of the nonlinear instability of the envelope, which happens in a quick manner and takes only a few FD cells. In contrast, the fourth order resonance is independent of rms matching and will be accompanied by beam evolution as "a long term effect" once the related mechanism is excited.

Li, Chao; Zhao, Ya Liang

2014-12-01

218

Measurement of Atmospheric Neutrinos at the Sudbury Neutrino Observatory  

E-print Network

The Sudbury Neutrino Observatory consists of a 1 kiloton heavy water Cherenkov detector able to detect and reconstruct high-energy muons created from cosmic ray showers and atmospheric neutrino interactions. By measuring ...

Formaggio, Joseph A.

219

Sterile Neutrino Fits to Short-Baseline Neutrino Oscillation Measurements  

E-print Network

This paper reviews short-baseline oscillation experiments as interpreted within the context of one, two, and three sterile neutrino models associated with additional neutrino mass states in the ~1?eV range. Appearance and ...

Conrad, J. M.

2013-01-01

220

Core-collapse supernova neutrinos and neutrino properties  

E-print Network

Core-collapse supernovae are powerful neutrino sources. The observation of a future (extra-)galactic supernova explosion or of the relic supernova neutrinos might provide important information on the supernova dynamics, on the supernova formation rate and on neutrino properties. One might learn more about unknown neutrino properties either from indirect effects in the supernova (e.g. on the explosion or on in the r-process) or from modifications of the neutrino time or energy distributions in a detector on Earth. Here we will discuss in particular possible effects of CP violation in the lepton sector. We will also mention the interest of future neutrino-nucleus interaction measurements for the precise knowledge of supernova neutrino detector response to electron neutrinos.

J. Gava; C. Volpe

2008-05-18

221

Physics and Astrophysics of Neutrinos  

NASA Astrophysics Data System (ADS)

Observations of neutrinos being emitted by the supernova SN1987A, star neutrinos, and atmospheric neutrinos by means of underground detectors have provided new insights into astronomy. These observations have brought to light new unresolved phenomena such as the solar neutrino problem, spurring investigative studies among particle physicists and astrophysicists. Today, intense interaction and continual cooperation between specialists in the field of particle physics and astronomy/cosmology are a pre-requisite for conducting further studies. This book provides detailed elaborations on selected topics. One of the most important features of this book is its enumeration of a number of basic properties of neutrinos and their relationship to Grand Unified Theories. It does not cover all aspects of neutrino theory, but rather focuses on the origin of the neutrino's mass and the generation mixing of neutrinos. The neutrino experiments described were carried out mainly by Japanese researchers. All the kamiokande results, detector performances, and complete references are included. Experiments regarding the neutrino's mass are represented in the direct mass measurement, the double beta-decay experiment, and the neutrino oscillation experiment. The detection of low-energy astrophysical neutrinos is discussed. Particle acceleration mechanisms in astrophysics and the detection of high-energy gamma-rays and neutrinos are also represented.

Fukugita, Masataka; Suzuki, Atsuto

1994-01-01

222

Prospect for Relic Neutrino Searches  

NASA Astrophysics Data System (ADS)

Neutrinos from the Big Bang are theoretically expected to be the most abundant particles in the Universe after the photons of the Cosmic Microwave Background (CMB). Unlike the relic photons, relic neutrinos have not so far been observed. The Cosmic Neutrino Background (C?B) is the oldest relic from the Big Bang, produced a few seconds after the Bang itself. Due to their impact in cosmology, relic neutrinos may be revealed indirectly in the near future through cosmological observations. In this talk we concentrate on other proposals, made in the last 30 years, to try to detect the C?B directly, either in laboratory searches (through tiny accelerations they produce on macroscopic targets) or through astrophysical observations (looking for absorption dips in the flux of Ultra-High Energy (UHE) neutrinos, due to the annihilation of these neutrinos with relic neutrinos at the Z-resonance). We concentrate mainly on the first possibility. We show that, given present bounds on neutrino masses, lepton number in the Universe and gravitational clustering of neutrinos, all expected laboratory effects of relic neutrinos are far from observability, awaiting future technological advances to reach the necessary sensitivity. The problem for astrophysical searches is that sources of UHE neutrinos at the extreme energies required may not exist. If they do exist, we could reveal the existence, and possibly the mass spectrum, of relic neutrinos, with detectors of UHE neutrinos (such as ANITA, Auger, EUSO, OWL, RICE and SalSA).

Gelmini, Graciela B.

2005-01-01

223

Prospect for Relic Neutrino Searches  

NASA Astrophysics Data System (ADS)

Neutrinos from the Big Bang are theoretically expected to be the most abundant particles in the Universe after the photons of the Cosmic Microwave Background (CMB). Unlike the relic photons, relic neutrinos have not so far been observed. The Cosmic Neutrino Background (C?B) is the oldest relic from the Big Bang, produced a few seconds after the Bang itself. Due to their impact in cosmology, relic neutrinos may be revealed indirectly in the near future through cosmological observations. In this talk we concentrate on other proposals, made in the last 30 years, to try to detect the C?B directly, either in laboratory searches (through tiny accelerations they produce on macroscopic targets) or through astrophysical observations (looking for absorption dips in the flux of Ultra-High Energy (UHE) neutrinos, due to the annihilation of these neutrinos with relic neutrinos at the Z-resonance). We concentrate mainly on the first possibility. We show that, given present bounds on neutrino masses, lepton number in the Universe and gravitational clustering of neutrinos, all expected laboratory effects of relic neutrinos are far from observability, awaiting future technological advances to reach the necessary sensitivity. The problem for astrophysical searches is that sources of UHE neutrinos at the extreme energies required may not exist. If they do exist, we could reveal the existence, and possibly the mass spectrum, of relic neutrinos, with detectors of UHE neutrinos (such as ANITA, Auger, EUSO, OWL, RICE and SalSA).

Gelmini, Graciela B.

2006-03-01

224

Atmospheric electron neutrinos in the MINOS far detector  

SciTech Connect

Neutrinos produced as a result of cosmic-ray interactions in the earth's atmosphere offer a powerful probe into the nature of this three-membered family of low-mass, weakly-interacting particles. Ten years ago, the Super-Kamiokande Experiment has confirmed earlier indications that neutrinos undergo lepton-flavor oscillations during propagation, proving that they are massive contrary to the previous Standard Model assumptions. The Soudan Underground Laboratory, located in northern Minnesota, was host to the Soudan2 Experiment, which has made important contributions to atmospheric neutrino research. This same lab has more recently been host to the MINOS far detector, a neutrino detector which serves as the downstream element of an accelerator-based long-baseline neutrino-oscillation experiment. This thesis has examined 418.5 live days of atmospheric neutrino data (fiducial exposure of 4.18 kton-years) collected in the MINOS far detector prior to the activation of the NuMI neutrino beam, with a specific emphasis on the investigation of electron-type neutrino interactions. Atmospheric neutrino interaction candidates have been selected and separated into showering or track-like events. The showering sample consists of 89 observed events, while the track-like sample consists of 112 observed events. Based on the Bartol atmospheric neutrino flux model of Barr et al. plus a Monte Carlo (MC) simulation of interactions in the MINOS detector, the expected yields of showering and track-like events in the absence of neutrino oscillations are 88.0 {+-} 1.0 and 149.1 {+-} 1.0 respectively (where the uncertainties reflect only the limited MC statistics). Major systematic uncertainties, especially those associated with the flux model, are cancelled by forming a double ratio of these observed and expected yields: R{sup data}{sub trk/shw}/R{sup MC}{sub trk/shw} = 0.74{sup +0.12}{sub -01.0}(stat.) {+-} 0.04 (syst.) This double ratio should be equal to unity in the absence of oscillations, and the value above disfavors null oscillation with 96.0% confidence. In addition, the showering sample can be used to measure the atmospheric neutrino flux. Based on the analysis presented in this thesis, the Bartol flux should be scaled by a factor of: S{sub atm} = 1.08 {+-} 0.12(stat.) {+-} 0.08(syst.) This is larger than, but consistent with, a measurement at the same location by the Soudan2 Experiment of S{sub atm} = 0.91 {+-} 0.07.

Speakman, Benjamin Phillip; /Minnesota U.

2007-01-01

225

Formation of Neutrino Stars from Cosmological Background Neutrinos  

E-print Network

We study hydrodynamic evolution of cosmological background neutrinos. By using a spherically symmetric Newtonian hydrodynamic code, we calculate the time evolution of the density profiles of neutrino matter in cluster and galactic scales. We discuss the possible observational consequences of such evolution and the resulting density profiles of the degenerate neutrino `stars' in galaxies and clusters.

M. H. Chan; M. -C. Chu

2006-09-20

226

Vetoing atmospheric neutrinos in a high energy neutrino telescope  

E-print Network

We discuss the possibility to suppress downward atmospheric neutrinos in a high energy neutrino telescope. This can be achieved by vetoing the muon which is produced by the same parent meson decaying in the atmosphere. In principle, atmospheric neutrinos with energies $E_\

Stefan Schönert; Thomas K. Gaisser; Elisa Resconi; Olaf Schulz

2008-12-22

227

First neutrino observations from the Sudbury Neutrino Observatory  

Microsoft Academic Search

The first neutrino observations from the Sudbury Neutrino Observatory are presented from preliminary analyses. Based on energy, direction and location, the data in the region of interest appear to be dominated by 8B solar neutrinos, detected by the charged current reaction on deuterium and elastic scattering from electrons, with very little background. Measurements of radioactive backgrounds indicate that the measurement

R. G. Allen; G. Buhler; H. H. Chen; J. D. Anglin; J. C. Barton; E. W. Beier; M. Bercovitch; J. Bigu; S. D. Biller; R. A. Black; I. Blevis; R. J. Boardman; J. Boger; E. Bonvin; M. G. Boulay; M. G. Bowler; T. J. Bowles; S. J. Brice; M. C. Browne; T. V. Bullard; J. Cameron; Y. D. Chan; M. Chen; X. Chen; B. T. Cleveland; E. T. H. Clifford; J. H. M. Cowan; D. F. Cowen; G. A. Cox; X. Dai; F. Dalnoki-Veress; W. F. Davidson; P. J. Doe; G. Doucas; M. R. Dragowsky; C. A. Duba; F. A. Duncan; M. Dunford; J. A. Dunmore; E. D. Earle; S. R. Elliott; H. C. Evans; G. T. Ewan; J. Farine; H. Fergani; A. P. Ferraris; R. J. Ford; J. A. Formaggio; M. M. Fowler; K. Frame; E. D. Frank; W. Frati; N. Gagnon; J. V. Germani; S. Gil; K. Graham; D. R. Grant; R. L. Hahn; A. L. Hallin; E. D. Hallman; A. S. Hamer; A. A. Hamian; W. B. Handler; R. U. Haq; C. K. Hargrove; P. J. Harvey; R. Hazama; K. M. Heeger; W. J. Heintzelman; J. Heise; R. L. Helmer; J. D. Hepburn; H. Heron; J. Hewett; A. Hime; J. G. Hykawy; M. C. P. Isaac; P. Jagam; N. A. Jelley; C. Jillings; G. Jonkmans; K. Kazkaz; P. T. Keener; J. R. Klein; A. B. Knox; R. J. Komar; R. Kouzes; T. Kutter; C. C. M. Kyba; J. Law; I. T. Lawson; M. Lay; H. W. Lee; K. T. Lesko; J. R. Leslie; I. Levine; W. Locke; S. Luoma; J. Lyon; S. Majerus; H. B. Mak; J. Maneira; J. Manor; A. D. Marino; N. McCauley; D. S. McDonald; A. B. McDonald; K. McFarlane; G. McGregor; R. Meijer; C. Mifflin; G. G. Miller; G. Milton; B. A. Moffat; M. Moorhead; C. W. Nally; M. S. Neubauer; F. M. Newcomer; H. S. Ng; A. J. Noble; E. B. Norman; V. M. Novikov; M. ONeill; C. E. Okada; R. W. Ollerhead; M. Omori; J. L. Orrell; S. M. Oser; A. W. P. Poon; T. J. Radcliffe; A. Roberge; B. C. Robertson; R. G. H. Robertson; S. S. E. Rosendahl; J. K. Rowley; V. L. Rusu; E. Saettler; K. K. Schaffer; M. H. Schwendener; A. Schulke; H. Seifert; M. Shatkay; J. J. Simpson; C. J. Sims

2001-01-01

228

Local demands on sterile neutrinos  

E-print Network

In a model independent manner, we explore the local implications of a single neutrino oscillation measurement which cannot be reconciled within a three-neutrino theory. We examine this inconsistency for a single region of baseline to neutrino energy $L/E$. Assuming that sterile neutrinos account for the anomaly, we find that the {\\it local} demands of this datum can require the addition to the theory of one to three sterile neutrinos. We examine the constraints which can be used to determine when more than one neutrino would be required. The results apply only to a given region of $L/E$. The question of the adequacy of the sterile neutrinos to satisfy a global analysis is not addressed here. Finally, using the results of a 3+2 analysis, we indicate values for unknown mixing matrix elements which would require two sterile neutrinos due to local demands only.

David C. Latimer; David J. Ernst

2005-09-23

229

Simulating nonlinear neutrino flavor evolution  

E-print Network

We discuss a new kind of astrophysical transport problem: the coherent evolution of neutrino flavor in core collapse supernovae. Solution of this problem requires a numerical approach which can simulate accurately the quantum mechanical coupling of intersecting neutrino trajectories and the associated nonlinearity which characterizes neutrino flavor conversion. We describe here the two codes developed to attack this problem. We also describe the surprising phenomena revealed by these numerical calculations. Chief among these is that the nonlinearities in the problem can engineer neutrino flavor transformation which is dramatically different than in standard Mikheyev-Smirnov-Wolfenstein treatments. This happens even though the neutrino mass-squared differences are measured to be small, and even when neutrino self-coupling is sub-dominant. Our numerical work has revealed potential signatures which, if detected in the neutrino burst from a Galactic core collapse event, could reveal heretofore unmeasurable properties of the neutrinos, such as the mass hierarchy and vacuum mixing angle theta_13.

Huaiyu Duan; George M. Fuller; J. Carlson

2008-03-26

230

Family Folklore  

ERIC Educational Resources Information Center

Discusses the Family Folklore Program of the Smithsonian Institution's annual Festival of American Folklife, in which the whole family can be involved in tracing family history through story telling, photographs, etc. (MS)

Kotkin, Amy J.; Baker, Holly C.

1977-01-01

231

Foster Families  

MedlinePLUS

... foster family? Let's find out. What Are Foster Families? The word "foster" means to help someone (or ... home. Continue Why Do Kids Live With Foster Families? Most often, a kid goes into a foster ...

232

Family History  

MedlinePLUS

Your family history includes health information about you and your close relatives. Families have many factors in common, including their genes, ... as heart disease, stroke, and cancer. Having a family member with a disease raises your risk, but ...

233

Family Functioning in Neglectful Families.  

ERIC Educational Resources Information Center

Comparison of family functioning in 103 neglectful and 102 nonneglectful low-income families found that neglectful mothers reported their families as having more family conflict and less expression of feelings, but not less cohesiveness. Observational measures indicated neglectful families were less organized, more chaotic, and less verbally…

Gaudin, James M., Jr.; And Others

1996-01-01

234

Physics in Action: Neutrino Astrophysics  

NSDL National Science Digital Library

This site provides information about the importance of neutrinos in stellar astronomy. It uses the famous supernova 1987A as an example of the energy carried by neutrinos. More information on supernovae and the solar neutrino question are provided, along with links to research.

Central, Physics

2004-04-08

235

Where are the beryllium neutrinos?  

E-print Network

We show that present experiments imply that neutrinos are nonstandard at the 87\\% C.L., independently of solar or nuclear physics. Moreover, if neutrinos are standard, the $^7$Be flux must be almost zero. Even if we arbitrarily disregard one of the experiments, the neutrino flux must still be less than half of the value predicted by standard solar models.

S. Degl'Innocenti; G. Fiorentini; M. Lissia

1994-08-30

236

Electromagnetic neutrino: a short review  

E-print Network

A short review on selected issues related to the problem of neutrino electromagnetic properties is given. After a flash look at the theoretical basis of neutrino electromagnetic form factors, constraints on neutrino magnetic moments and electric millicharge from terrestrial experiments and astrophysical observations are discussed. We also focus on some recent studies of the problem and on perspectives.

Alexander I. Studenikin

2014-11-09

237

Electromagnetic neutrino: a short review  

E-print Network

A short review on selected issues related to the problem of neutrino electromagnetic properties is given. After a flash look at the theoretical basis of neutrino electromagnetic form factors, constraints on neutrino magnetic moments and electric millicharge from terrestrial experiments and astrophysical observations are discussed. We also focus on some recent studies of the problem and on perspectives.

Studenikin, Alexander I

2014-01-01

238

Supernova Neutrinos Detection On Earth  

E-print Network

In this paper, we first discuss the detection of supernova neutrino on Earth. Then we propose a possible method to acquire information about $\\theta_{13}$ smaller than $1.5^\\circ$ by detecting the ratio of the event numbers of different flavor supernova neutrinos. Such an sensitivity cannot yet be achieved by the Daya Bay reactor neutrino experiment.

Xin-Heng Guo; Ming-Yang Huang; Bing-Lin Young

2009-05-11

239

Relic neutrinos: Physically consistent treatment of effective number of neutrinos and neutrino mass  

NASA Astrophysics Data System (ADS)

We perform a model independent study of the neutrino momentum distribution at freeze-out, treating the freeze-out temperature as a free parameter. Our results imply that measurement of neutrino reheating, as characterized by the measurement of the effective number of neutrinos N?, amounts to the determination of the neutrino kinetic freeze-out temperature within the context of the standard model of particle physics where the number of neutrino flavors is fixed and no other massless (fractional) particles arise. At temperatures on the order of the neutrino mass, we show how cosmic background neutrino properties, i.e., energy density, pressure, and particle density, are modified in a physically consistent way as a function of neutrino mass and N?.

Birrell, Jeremiah; Yang, Cheng-Tao; Chen, Pisin; Rafelski, Johann

2014-01-01

240

Topological Constraints on Long-Distance Neutrino Mixtures  

Microsoft Academic Search

A new internal description of fundamental fermions (quarks and leptons),\\u000abased on a matrix-generalization (F) of the scalar fermion-number f, predicts\\u000athat only three families of quarks and leptons, and their associated neutrinos\\u000a(nu_e, nu_mu and nu_tau), exist. Moreover, this description places important\\u000atopological constraints on neutrino mixing. For example, with respect to F, the\\u000atopology of the nu_e (nu_mu

Gerald L. Fitzpatrick

2000-01-01

241

Testing solar lepton mixing sum rules in neutrino oscillation experiments  

E-print Network

Small discrete family symmetries such as S4, A4 or A5 may lead to simple leading-order predictions for the neutrino mixing matrix such as the bimaximal, tribimaximal or golden ratio mixing patterns, which may be brought into agreement with experimental data with the help of corrections from the charged-lepton sector. Such scenarios generally lead to relations among the parameters of the physical leptonic mixing matrix known as solar lepton mixing sum rules. In this article, we present a simple derivation of such solar sum rules, valid for arbitrary neutrino and charged lepton mixing angles and phases, assuming only {\\theta}13^{\

Peter Ballett; Stephen F. King; Christoph Luhn; Silvia Pascoli; Michael A. Schmidt

2014-11-13

242

Extraterrestrial Solar Neutrino Physics  

E-print Network

We advocate the extraterrestrial solar neutrino physics (etSNP) as a means of investigating solar neutrino physics (SNP). As we already know, the dominant and subdominant (vacuum) oscillation lengths would be approximately one kilometer and one hundred kilometers. On the other hand, we know so far that the matter-enhanced oscillations take place only in the core of the Sun. Thus, the etSNP, i.e. solar neutrino physics that could be extracted outside the Earth, would assume a special unique role. The etSNP experiments include (1) a satellite (detector) around the Earth or around the Jupiter or others (to provide the shadow, for the matter-enhanced neutrino oscillations), (2) during the Sun-Venus-Earth eclipse or similar, and (3) the chemical compositions of the geology type (as in the Jupiter or in the Venus, to study the origins of these planets). To be specific, we note that the reactions induced by the ^8B solar neutrinos, in view of the sole high energy nature (E_\

W-Y. Pauchy Hwang; Jen-Chieh Peng

2010-03-23

243

Neutrino oscillations: brief history and present status  

E-print Network

A brief review of the problem of neutrino masses and oscillations is given. In the beginning we present an early history of neutrino masses, mixing and oscillations. Then we discuss all possibilities of neutrino masses and mixing (neutrino mass terms). The phenomenology of neutrino oscillations in vacuum is considered in some details. We present also the neutrino oscillation data and the seesaw mechanism of the neutrino mass generation.

S. M. Bilenky

2014-08-12

244

Black rings with fourth dipole cause less hair loss  

E-print Network

An example of entropy enigma with a controlled CFT dual was recently studied in arXiv:1108.0411. The enigmatic bulk configurations, considered within the STU model, can be mapped under spectral flow into black rings with three monopole and dipole charges. Even though the bulk and CFT configurations existed in the same region of parameter space, the Bekenstein-Hawking entropy of the bulk configurations was found to be lower than the microscopic entropy from the CFT. While it is possible that the difference in entropy is due to the bulk and boundary configurations being at different points in the moduli space, it is also possible that the bulk configurations embeddable within the STU model are not the most entropic. New families of BPS black ring solutions with four electric and four dipole magnetic charges have recently been explicitly constructed in arXiv:1201.2585. These black rings are not embeddable within the STU model. In this paper we investigate if these black rings can be entropically dominant over the STU model black rings. We find that the new black rings are always entropically subdominant to the STU-model black rings. However, for small fourth dipole charge these black rings continue to be dominant over the BMPV in a small region of parameters and are thus enigmatic.

Borun D. Chowdhury

2012-04-19

245

Family functioning in neglectful families  

Microsoft Academic Search

Family functioning in 103 neglectful and 102 non-neglectful low-income families is examined using self-report and observational measures. Neglectful mothers reported their families as having more family conflict and less expression of feelings, but not less cohesive. Ratings of observed and videotaped family interactions indicated neglect families were less organized, more chaotic, less verbally expressive, showed less positive and more negative

James M. Gaudin; Norman A. Polansky; Allie C. Kilpatrick; Paula Shilton

1996-01-01

246

Is family size related to adolescence mental hospitalization?  

Microsoft Academic Search

The aim of this study was to investigate the association between family size and psychiatric disorders of underage adolescent psychiatric inpatients. The study sample consisted of 508 adolescents (age 12–17) admitted to psychiatric impatient care between April 2001 and March 2006. Diagnostic and Statistical Manual of Mental Disorders, fourth edition-based psychiatric diagnoses and variables measuring family size were obtained from

Paula Kylmänen; Helinä Hakko; Pirkko Räsänen; Kaisa Riala

2010-01-01

247

Special Needs in Education (E241): Family Views, Unit 3.  

ERIC Educational Resources Information Center

The fourth of 16 booklets designed for use in an Open University course about education for handicapped children in the United Kingdom, this document focuses on family life, particularly in families with severely handicapped children. Parents' reactions to the initial diagnosis of their child's handicapping condition are discussed, as well as the…

Thomas, Davis; Swann, Will

248

Limits on neutrino-neutrino scattering in the early Universe  

NASA Astrophysics Data System (ADS)

In the standard model neutrinos are assumed to have streamed across the Universe since they last scattered when the standard-model plasma temperature was ˜MeV . The shear stress of free-streaming neutrinos imprints itself gravitationally on the cosmic microwave background (CMB) and makes the CMB a sensitive probe of neutrino scattering. Yet, the presence of nonstandard physics in the neutrino sector may alter this standard chronology and delay neutrino free streaming until a much later epoch. We use observations of the CMB to constrain the strength of neutrino self interactions Geff and put limits on new physics in the neutrino sector from the early Universe. Within the context of conventional ? CDM parameters cosmological data are compatible with Geff?1 /(56 MeV )2 and neutrino free streaming might be delayed until their temperature has cooled to as low as ˜25 eV . Intriguingly, we also find an alternative cosmology compatible with cosmological data in which neutrinos scatter off each other until z ˜1 04 with a preferred interaction strength in a narrow region around Geff?1 /(10 MeV )2?8.6 ×1 08GF , where GF is the Fermi constant. This distinct self-interacting neutrino cosmology is characterized by somewhat lower values of both the scalar spectral index and the amplitude of primordial fluctuations. While we phrase our discussion here in terms of a specific scenario, our constraints on the neutrino visibility function are very general.

Cyr-Racine, Francis-Yan; Sigurdson, Kris

2014-12-01

249

Probing Late Neutrino Mass Properties with Supernova Neutrinos  

E-print Network

Models of late-time neutrino mass generation contain new interactions of the cosmic background neutrinos with supernova relic neutrinos (SRNs) through exchange of the on-shell light boson, leading to significant modification of the differential SRN flux observed at earth. We consider Abelian U(1) model for generating neutrino masses at low scales and we show that there is a large parameter space in this model for which the changes induced in the flux by the exchange of the light bosons might allow one to distinguish between neutrinos being Majorana or Dirac particles, the type of neutrino mass hierarchy (normal or inverted or quasi-degenerate), and could also possibly determine the absolute values of the neutrino masses. Measurements of the presence of these effects would be possible at the next-generation water Cerenkov detectors enriched with Gadolinium, or a large 100 kton liquid argon detector.

Joseph L. Baker; Haim Goldberg; Gilad Perez; Ina Sarcevic

2007-08-08

250

Probing late neutrino mass properties with supernova neutrinos  

NASA Astrophysics Data System (ADS)

Models of late-time neutrino mass generation contain new interactions of the cosmic background neutrinos with supernova relic neutrinos (SRNs). Exchange of an on-shell light scalar may lead to significant modification of the differential SRN flux observed at earth. We consider an Abelian U(1) model for generating neutrino masses at low scales, and show that there are cases for which the changes induced in the flux allow one to distinguish the Majorana or Dirac nature of neutrinos, as well as the type of neutrino mass hierarchy (normal or inverted or quasidegenerate). In some region of parameter space the determination of the absolute values of the neutrino masses is also conceivable. Measurements of the presence of these effects may be possible at the next-generation water Cerenkov detectors enriched with Gadolinium, or a 100 kton liquid argon detector.

Baker, Joseph; Goldberg, Haim; Perez, Gilad; Sarcevic, Ina

2007-09-01

251

Signatures of the neutrino mass hierarchy in supernova neutrinos  

E-print Network

The undetermined neutrino mass hierarchy may leave observable imprint on the neutrino fluxes from the core-collpse supernova (SN). The interpretation of the observables, however, is subject to the uncertain SN models and the flavor conversion mechanism of neutrinos in a SN. We attempt to propose a qualitative and model-independent interpretation of the expected neutrino events at terrestrial detectors, focusing on the accretion phase of the neutrino burst. The flavor conversions due to the neutrino self-interaction, the MSW effect, and the Earth regeneration effect are incorporated in the calculation. It leads to several distinct scenarios that are identified by the neutrino mass hierarchies and the collective flavor transitions. Consequences resulting from the variation of incident angles and SN models are also discussed.

S. H. Chiu; Chu-Ching Huang; Kwang-Chang Lai

2014-04-07

252

Plasmon decay to a neutrino pair via neutrino electromagnetic moments in a strongly magnetized medium  

E-print Network

We calculate the neutrino luminosity of a degenerate electron gas in a strong magnetic field via plasmon decay to a neutrino pair due to neutrino electromagnetic moments and obtain the relative upper bounds on the effective neutrino magnetic moment.

A. V. Borisov; P. E. Sizin

2014-06-12

253

The neutrino signal at HALO: learning about the primary supernova neutrino fluxes and neutrino properties  

SciTech Connect

Core-collapse supernova neutrinos undergo a variety of phenomena when they travel from the high neutrino density region and large matter densities to the Earth. We perform analytical calculations of the supernova neutrino fluxes including collective effects due to the neutrino-neutrino interactions, the Mikheev-Smirnov-Wolfenstein (MSW) effect due to the neutrino interactions with the background matter and decoherence of the wave packets as they propagate in space. We predict the numbers of one- and two-neutron charged and neutral-current electron-neutrino scattering on lead events. We show that, due to the energy thresholds, the ratios of one- to two-neutron events are sensitive to the pinching parameters of neutrino fluxes at the neutrinosphere, almost independently of the presently unknown neutrino properties. Besides, such events have an interesting sensitivity to the spectral split features that depend upon the presence/absence of energy equipartition among neutrino flavors. Our calculations show that a lead-based observatory like the Helium And Lead Observatory (HALO) has the potential to pin down important characteristics of the neutrino fluxes at the neutrinosphere, and provide us with information on the neutrino transport in the supernova core.

Väänänen, Daavid; Volpe, Cristina, E-mail: vaananen@ipno.in2p3.fr, E-mail: volpe@ipno.in2p3.fr [Institut de Physique Nucléaire, F-91406 Orsay cedex, CNRS/IN2P3 and University of Paris-XI (France)

2011-10-01

254

Fourth Meeting on CPT and Lorentz Symmetry  

NASA Astrophysics Data System (ADS)

Improved tests of Lorentz and CPT symmetry using noble-gas masers / A. Glenday, D. F. Phillips, and R. L. Walsworth -- A modern Michelson-Morley experiment using actively rotated optical resonators / S. Herrmann et al. -- Rotating experiments to test Lorentz invariance in the photon sector / M. E. Tobar et al. -- Lorentz violation, electrodynamics, and the cosmic microwave background / M. Mewes -- High energy astrophysical tests of Lorentz invariance / B. Altschul -- Fundamental physics experiments in space (within ESA) / T. J. Sumner -- The experimental foundations of the Dirac equation / C. Lämmerzahl -- Perspectives on Lorentz and CPT violation / V. A. Kostelecký -- Search for Lorentz and CPT violation effects in muon spin precession / B. L. Roberts -- Lorentz violation in a diffeomorphism-invariant theory / R. Jackiw -- Studies of CPT symmetry with ASACUSA / R. S. Hayano -- Neutrino oscillations and Lorentz violation with MiniBooNE / R. Tayloe and T. Katori -- Testing Lorentz and CPT invariance with MINOS near detector neutrinos / B. J. Rebel and S. L. Mufson -- Einstein-?ther gravity: theory and observational constraints / T. Jacobson -- Tests of Lorentz-invariance violation in neutrino oscillations / K. Whisnant -- Search for CPT violation in neutral kaons at KLOE: status and perspectives / A. Di Domenico et al. -- Search for CPT violation in B[symbol]-B¯[symbol] oscillations with BABAR / D. P. Stoker -- Theoretical topics in spacetime-symmetry violations / R. Lehnert -- A second-generation co-magnetometer for testing fundamental symmetries / S. J. Smullin et al. -- Nambu-Goldstone and massive modes in gravitational theories with spontaneous Lorentz breaking / R. Bluhm -- The ALPHA antihydrogen experiment / N. Madsen et al. -- Atom interferometry tests the isotropy of post-Newtonian gravity / H. Müller et al. -- Probing Lorentz symmetry with gravitationally coupled matter / J. D. Tasson -- Torsion balance test of preferred-frame and weak coupling to polarized electrons / B. R. Heckel et al. -- Seeking a solution of the pioneer anomaly / M. M. Nieto and J. D. Anderson -- Testing Lorentz symmetry with gravity / Q. C. Bailey -- Preferred frame effects in relativistic binary pulsars / M. Kramer and N. Wex -- APOLLO: next generation lunar laser ranging / T. W. Murphy, Jr. et al. -- Constraints on Lorentz violation from gravity Probe B / J. M. Overduin -- Preliminary results from a test of CPT and Lorentz symmetry using a K-[symbol]He co-magnetometer / T. W. Kornack, G. Vasilakis, and M. V. Rornalis -- Constraining quantum gravity with GLAST / F. Kuehn, R. Hughes, and B. Winer -- Renormalization of Lorentz-violating theories / D. Anselmi -- Renormalization of gauge theories with Lorentz violation / D. Colladay and P. McDonald -- A POEM-based test of the WEP using a Sounding Rocket (SR-POEM) / R. D. Reasenberg and J. D. Phillips -- Testing alternative oscillation scenarios with atmospheric neutrinos using AMANDA-II data from 2000 to 2003 / J. Ahrens and J. L. Kelley -- Measurement of the ground-state hyperfine splitting of antihydrogen / B. Juhász and E. Widmann -- Spontaneous Lorentz violation and baryogenesis / J. Shu -- Lorentz invariance tested with fast optical ion clocks in a storage ring / G. Gwinner et al. -- Bose-Einstein condensates and Lorentz violation / D. Colladay and P. McDonald -- Embedding geometry and decomposition of gravity / T. E. Clark et al. -- The first lunar laser ranging constraints on gravity sector SME parameters / J. B. R. Battat, J. F. Chandler, and C. W. Stubbs -- A theory of gravity from Lorentz violation / R. Potting -- Search for Lorentz violation in a high-frequency gravitational experiment below 50 microns / W. A. Jensen, S. M. Lewis, and J. C. Long -- Lorentz violation and torsion / N. Russell -- Probing Lorentz invariance using coherent optical phenomena / J. P. Cotter, M. P. Hill, and B. T. H. Varcoe -- Constraint analysis of bumblebee models / N. Gagne and A. Vrublevslcis -- Ives-Stilwell for the new millennium / M. A. Nohensee, D. F. Phillips, and R. L. Walsworth -- Test for

Kostelecký, V. Alan

2008-03-01

255

Popcorn Neutrino Lab  

NSDL National Science Digital Library

Students will participate in a modeling activity that simulates the cyclical role of experimental and theoretical science. Initially, the students will measure the mass of popcorn kernels. While the mass of the kernels are determined, students will also make predictions of the mass of the kernels after they are popped. After the popcorn is popped, the mass of the popcorn is measured. Data is shared and students articulate theories that explain why the masses do not agree. After the experiment, the topic of neutrinos is introduced. Essentially, the unpopped kernels represent neutrons and the popped kernels represent protons, electrons, and neutrinos. As students relate the experiment to the theoretical discovery of the neutrino, dialogue can follow discussing the strengths and weaknesses of the model.

Petula, Jason

256

Entanglement in neutrino oscillations  

E-print Network

Flavor oscillations in elementary particle physics are related to multi-mode entanglement of single-particle states. We show that mode entanglement can be expressed in terms of flavor transition probabilities, and therefore that single-particle entangled states acquire a precise operational characterization in the context of particle mixing. We treat in detail the physically relevant cases of two- and three-flavor neutrino oscillations, including the effective measure of CP violation. We discuss experimental schemes for the transfer of the quantum information encoded in single-neutrino states to spatially delocalized two-flavor charged lepton states, thus showing, at least in principle, that single-particle entangled states of neutrino mixing are legitimate physical resources for quantum information tasks.

Massimo Blasone; Fabio Dell'Anno; Silvio De Siena; Fabrizio Illuminati

2009-04-17

257

Neutrino physics: Summary talk  

SciTech Connect

This paper is organized as follows: First, I describe the state of neutrino phenomenology. Emphasis is placed on sin/sup 2/ /theta//sub W/, its present status and future prospects. In addition, some signatures of ''new physics'' are described. Then, kaon physics at Fermilab is briefly discussed. I concentrate on the interesting rare decay K/sub L/ /yields/ /pi//sup 0/e/sup +/e/sup /minus// which may be a clean probe direct CP violation. Neutrino mass, mixing, and electromagnetic moments are surveyed. There, I describe the present state and future direction of accelerator based experiments. Finally, I conclude with an outlook on the future. Throughout this summary, I have drawn from and incorporated ideas discussed by other speakers at this workshop. However, I have tried to combine their ideas with my own perspective on neutrino physics and where it is headed. 49 refs., 3 figs., 4 tabs.

Marciano, W.J.

1989-04-01

258

Tritium neutrino mass experiments  

SciTech Connect

The current status of the experimental search for neutrino mass is reviewed, with emphasis on direct kinematic methods, such as the beta decay of tritium. The situation concerning the electron neutrino mass as measured in tritium beta decay is essentially unchanged from a year ago, although a great deal of experimental work is in progress. The ITEP group continues to find evidence for a nonzero mass, now slightly revised to 26(5) eV. After correcting for recently discovered errors in the energy loss distribution and source thickness, however, the Z/umlt u/rich group still claims and upper limit of 18 eV. There may be evidence for neutrino mass and mixing in the SN1987a data, in the same range suggested by the ITEP experiment. 42 refs., 3 figs.

Robertson, R.G.H.

1988-01-01

259

[Family Involvement.  

ERIC Educational Resources Information Center

This theme issue provides four articles that address family involvement in the transition of youth with disabilities from school to work. The first article, "Family Involvement" by Marge Goldberg and Shauna McDonald, offers evidence of the importance of family involvement at this stage of the individual's life, reports on families' experiences,…

Alliance: The Newsletter of the National Transition Alliance, 1996

1996-01-01

260

Family Privilege  

ERIC Educational Resources Information Center

Family privilege is defined as "strengths and supports gained through primary caring relationships." A generation ago, the typical family included two parents and a bevy of kids living under one roof. Now, every variation of blended caregiving qualifies as family. But over the long arc of human history, a real family was a…

Seita, John R.

2014-01-01

261

Reactor incident status 1987 fourth quarter report  

SciTech Connect

Reactor Incident (RI) status reports are issued quarterly to document the followup status of the Savannah River Site K, P, and L reactors RI report conclusions and recommendations. (C reactor operation has been discontinued and the reactor placed in a standby status as a result of inability to correct reactor vessel cracks and reduction in product demand. C reactor RI reports which have bearing on the other reactors are also documented). Followup status includes maintenance and other remedial actions taken and/or planned. The quarterly report documents the RI reports issued in the current quarter (fourth quarter, 1987) as well as the most significant reports issued prior to the current quarter last documented as unresolved. The status of recommendations followup activities is being traced through the use of a data base management system. 7 figs., 11 tabs. (MHB)

Pong, E.L.

1988-04-05

262

Resonant solar neutrino oscillation experiments  

SciTech Connect

The results of a detailed calculation of the effects of resonant neutrino oscillations in the sun on the current and proposed solar neutrino experiments are presented. Analytic results are used for the electron-neutrino survival probability so that a sophisticated model for both the production distribution of the solar neutrino sources and the solar electron-number density can be employed. Contour plots for the electron-neutrino capture rate, in the mass-difference-squared versus vacuum-mixing-angle plane, are given for the current /sup 37/Cl experiment and the proposed /sup 71/Ga detector.

Parke, S.J.; Walker, T.P.

1986-11-03

263

Majorana neutrinos, neutrino mass spectrum, CP violation, and neutrinoless double ? decay. II. Mixing of four neutrinos  

NASA Astrophysics Data System (ADS)

Assuming four-neutrino mixing and massive Majorana neutrinos, we study the implications of neutrino oscillation solutions of the solar and atmospheric neutrino problems, of the results of the Liquid Scintillation Neutrino Detector (LSND) experiment and of the constraints on neutrino oscillations, obtained in reactor and accelerator experiments, for the predictions of the effective Majorana mass in neutrinoless double beta ((??)0?-) decay, \\|\\|. All four-neutrino mass spectra compatible with the existing neutrino mass and oscillation data are considered: 2+2A,B and 3+1A,B,C. The general case of CP nonconservation is investigated. The predicted values of \\|\\| depend strongly on the value of the lightest neutrino mass m1, on the type of the neutrino mass spectrum, on the LSND neutrino mass-squared difference ?m2SBL, on the solution of the solar neutrino problem, as well as on the values of the three Majorana CP-violating phases, present in the lepton mixing matrix. If CP invariance holds, \\|\\| is very sensitive to the values of the relative CP parities of the massive Majorana neutrinos. We also analyze in detail the question of whether a measurement of \\|\\|>~0.01 eV in the next generation of (??)0?-decay experiments (NEMO3, CUORE, EXO, and GENIUS), combined with the data from the solar, atmospheric, reactor and accelerator neutrino oscillation experiments and from the future neutrino mass 3H ?-decay experiment KATRIN would allow us, and under what conditions, (i) to determine the absolute values of the neutrino masses and thus the neutrino mass spectrum, and (ii) to establish the existence of CP violation in the lepton sector. We have pointed out, in particular, that the 2+2A and 3+1A spectra can be critically tested by the KATRIN experiment. The latter, in particular, can provide information on the value of the lightest neutrino mass m1 in the cases of the spectra 2+2A, 3+1A, 3+1B, and 3+1C. For these neutrino mass spectra there exists a direct relation between \\|\\| or m1 and the neutrino mass measured in 3H ? decay, m?e, and the measurement of \\|\\|>~0.01 eV and of m?e>~0.4 eV will provide the unique possibility to determine the absolute values of all four neutrino masses and to obtain information on CP violation in the lepton sector.

Bilenky, S. M.; Pascoli, S.; Petcov, S. T.

2001-12-01

264

Introduction: The Fourth International Workshop on Epigenetic Robotics  

E-print Network

Introduction: The Fourth International Workshop on Epigenetic Robotics Luc Berthouze Neuroscience engineering embodied systems and, on the other hand, building artificial epigenetic systems. Epigenetic

Sandini, Giulio

265

Fourth International Symposium Computational Methods in Toxicology and Pharmacology  

E-print Network

Fourth International Symposium Computational Methods in Toxicology and Pharmacology Integrating Toxicology, EPA, NC, USA. NEW PUBLIC DATA & INTERNET RESOURCES IMPACTING PREDICTIVE TOXICOLOGY 20:00 - 22

Ferreira, Márcia M. C.

266

13. FOURTH FLOOR ROASTING ROOM, SHOWING CLERESTORY. VIEW TO SOUTH. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. FOURTH FLOOR ROASTING ROOM, SHOWING CLERESTORY. VIEW TO SOUTH. - Commercial & Industrial Buildings, McFadden Coffee & Spice Company, Factory & Warehouse, 145 First Street, Dubuque, Dubuque County, IA

267

95. ROOM 402 (LAW LIBRARY), EAST WING, FOURTH FLOOR, LOOKING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

95. ROOM 402 (LAW LIBRARY), EAST WING, FOURTH FLOOR, LOOKING SOUTHEAST - Smithsonian Institution Building, 1000 Jefferson Drive, between Ninth & Twelfth Streets, Southwest, Washington, District of Columbia, DC

268

Massive Neutrinos and (Heterotic) String Theory  

E-print Network

String theories in principle address the origin and values of the quark and lepton masses. Perhaps the small values of neutrino masses could be explained generically in string theory even if it is more difficult to calculate individual values, or perhaps some string constructions could be favored by generating small neutrino masses. We examine this issue in the context of the well-known three-family standard-like Z_3 heterotic orbifolds, where the theory is well enough known to construct the corresponding operators allowed by string selection rules, and analyze the D- and F-flatness conditions. Surprisingly, we find that a simple see-saw mechanism does not arise. It is not clear whether this is a property of this construction, or of orbifolds more generally, or of string theory itself. Extended see-saw mechanisms may be allowed; more analysis will be needed to settle that issue. We briefly speculate on their form if allowed and on the possibility of alternatives, such as small Dirac masses and triplet see-saws. The smallness of neutrino masses may be a powerful probe of string constructions in general. We also find further evidence that there are only 20 inequivalent models in this class, which affects the counting of string vacua.

Joel Giedt; G. L. Kane; Paul Langacker; Brent D. Nelson

2005-02-02

269

Solar neutrino experiments  

Microsoft Academic Search

New results are presented for absorption cross sections of nine possible detectors of solar neutrinos (⁷Li, ³⁷Cl, ⁵¹V, ⁵⁵Mn, ⁷¹Ga, ⁸¹Br, ⁸⁷Rb, ¹¹⁵In, and ²°⁵Tl). Special attention is given to nuclear physics uncertainties. The calculated cross sections are used (with the aid of illustrative solar models and ad hoc assumptions about neutrino propagation) to discuss what can be learned about

John Bahcall

1978-01-01

270

Neutrinos from Auger Sources  

E-print Network

The Pierre Auger observatory has presented evidence that the arrival directions of cosmic rays with energies in excess of 6x10^7 TeV may be correlated with nearby active galactic nuclei (AGN). In this context we revisit a suggestion based on gamma ray observations that nearby Fanaroff-Riley I galaxies such as Cen A and M87 are the sources of the local cosmic rays. We compute the accompanying neutrino flux and find a flux within reach of second-generation kilometer-scale neutrino telescopes.

Francis Halzen; Aongus O'Murchadha

2008-02-28

271

Neutrino Telescopes in Antarctica  

NASA Astrophysics Data System (ADS)

It is hoped that in the near future neutrino astronomy will reach throughout and beyond our galaxy and make measurements relevant to cosmology, astrophysics, cosmic-ray and particle physics. The construction of a high-energy neutrino telescope requires a huge volume of very transparent, deeply buried material such as ocean water or ice, which acts as the medium for detecting the particles. I will describe two experiments using Antarctic ice as this medium: the AMANDA experiment employing photomultiplier tubes and RICE utilising radio receivers.

Adams, Jenni

2000-04-01

272

Neutrinos Have Mass - So What?  

E-print Network

In this brief review, I discuss the new physics unveiled by neutrino oscillation experiments over the past several years, and discuss several attempts at understanding the mechanism behind neutrino masses and lepton mixing. It is fair to say that, while significant theoretical progress has been made, we are yet to construct a coherent picture that naturally explains non-zero, yet tiny, neutrino masses and the newly revealed, puzzling patterns of lepton mixing. I discuss what the challenges are, and point to the fact that more experimental input (from both neutrino and non-neutrino experiments) is dearly required - and that new data is expected to reveal, in the next several years, new information. Finally, I draw attention to the fact that neutrinos may have only just begun to reshape fundamental physics, given the fact that we are still to explain the LSND anomaly and because the neutrino oscillation phenomenon is ultimately sensitive to very small new-physics effects.

Andre de Gouvea

2005-03-09

273

ccsd-00016511,version1-5Jan2006 Neutrino Physics/Physique des neutrinos  

E-print Network

ccsd-00016511,version1-5Jan2006 Neutrino Physics/Physique des neutrinos Reactor Neutrinos Thierry Abstract We review the status and the results of reactor neutrino experiments, that toe the cutting edge of neutrino research. Short baseline experiments have provided the measurement of the reactor neutrino

Boyer, Edmond

274

The JHF-Kamioka neutrino project  

Microsoft Academic Search

The JHF-Kamioka neutrino project is a second generation long base line neutrino oscillation experiment that probes physics beyond the Standard Model by high precision measurements of the neutrino masses and mixing. A high intensity narrow band neutrino beam is produced by secondary pions created by a high intensity proton synchrotron at JHF (JAERI). The neutrino energy is tuned to the

Y. Itow; T. Kajita; K. Kaneyuki; M. Shiozawa; Y. Totsuka; Y. Hayato; T. Ishida; T. Ishii; T. Kobayashi; T. Maruyama; K. Nakamura; Y. Obayashi; Y. Oyama; M. Sakuda; M. Yoshida; S. Aoki; T. Hara; A. Suzuki; A. Ichikawa; T. Nakaya; K. Nishikawa; T. Hasegawa; K. Ishihara; A. Konaka

2001-01-01

275

Neutrinos from a core collapse supernova  

E-print Network

The neutrino burst from a galactic supernova can help determine the neutrino mass hierarchy and $\\theta_{13}$, and provide crucial information about supernova astrophysics. Here we review our current understanding of the neutrino burst, flavor conversions of these neutrinos, and model independent signatures of various neutrino mixing scenarios.

Amol Dighe

2007-12-28

276

Review of the physics of the neutrino  

SciTech Connect

The status of knowledge with respect to neutrinos is reviewed. Questions covered briefly include whether or not a neutrino is its own antiparticle and neutrino mass. Experimental studies are also considered, including neutrino oscillations, double beta decay, and direct neutrino mass measurements. (LEW)

Robertson, R.G.H.

1986-01-01

277

Probing Pseudo-Dirac Neutrino through Detection of Neutrino Induced Muons from GRB Neutrinos  

E-print Network

The possibility to verify the pseudo-Dirac nature of neutrinos is investigated here via the detection of ultra high energy neutrinos from distant cosmological objects like GRBs. The very long baseline and the energy range from $\\sim$ TeV to $\\sim$ EeV for such neutrinos invokes the likelihood to probe very small pseude-Dirac splittings. The expected secondary muons from such neutrinos that can be detected by a kilometer scale detector such as ICECUBE is calculated. The pseudo-Dirac nature, if exists, will show a considerable departure from flavour oscillation scenario in the total yield of the secondary muons induced by such neutrinos.

Debasish Majumdar

2006-07-31

278

Family Governance with Family Councils  

Microsoft Academic Search

From the third generation onwards, family firms could get into business threatening situations. This might depend on the growing number of owners, the increasing distance of family members from the firm, and the heterogeneity of their interests. Thus, agency prob- lems and negative conflicts might occur. This calls for the appropriate choice of family gov- ernance mechanisms. Family councils might

Klaus Brockhoff; Alexander Koeberle-Schmid

279

Family Violence and Family Physicians  

PubMed Central

The acronym IDEALS summarizes family physicians' obligations when violence is suspected: to identify family violence; document injuries; educate families and ensure safety for victims; access resources and coordinate care; co-operate in the legal process; and provide support for families. Failure to respond reflects personal and professional experience and attitudes, fear of legal involvement, and lack of knowledge. Risks of intervention include physician burnout, physician overfunctioning, escalation of violence, and family disruption. PMID:21228987

Herbert, Carol P.

1991-01-01

280

Fireball Heated by Neutrinos  

E-print Network

The fireball, the promising model of the gamma-ray burst (GRB), is an opaque radiation plasma, whose energy is significantly greater than its rest mass. We numerically simulate the evolution of the fireball heated by the neutrino-antineutrino annihilation process for the spherically symmetric case. We also derive analytical energy and momentum deposition rates via neutrino scattering with thermalized electron-positron pairs in the fireball. In our simulation the matter is provided around the neutrinosphere before neutrinos start to be emitted, and the energy is injected during a finite period of time $t_{\\rm dur}$. In the acceleration regime the matter shell is pushed from behind by radiation pressure. The Lorentz factor of the shell reaches the maximum value $\\eta$ at $r \\simeq \\eta^2 c t_{\\rm dur}$. After the fireball enters the coasting regime, the velocity distribution in the shell becomes very flat. The shell expansion rate $d W/dr$ can be much smaller than $\\eta^{-2}$. The runaway of temperature of the fireball due to neutrino scattering with electron-positron pairs does not occur in most cases. The energy deposition due to scattering is not so significant.

Katsuaki Asano; Shizuo Iwamoto

2002-10-05

281

Neutrinos from Protoneutron Stars  

E-print Network

We study the diffusive transport of neutrinos in a newly born neutron star to explore its sensitivity to dense matter properties. Energy and lepton number which are trapped during the catastrophic implosion diffuse out on the time scale of a few tens of seconds. Results for different dense matter models are presented.

S. Reddy; J. Pons; M. Prakash; J. M. Lattimer

1998-02-24

282

Pizza Anyone? Exploring Halves and Fourths/Quarters  

NSDL National Science Digital Library

This activity practices the decomposing of a whole to equal shares for halves, fourths, and quarters through pizza and candy bar manipulatives. Students are then challenge to demonstrate how many different ways they can fold a square sticky not into fourths!

Harris, Brandi

2012-07-31

283

Posterior inferior cerebellar artery aneurysm in the fourth ventricle  

Microsoft Academic Search

We report a patient with a ruptured aneurysm of the choroidal branch of the right posterior inferior cerebellar artery (PICA), lying in and causing an isolated haemorrhage in the fourth ventricle. MRI on the first day after bleeding revealed an abnormal vessel in the fourth ventricle, which was surrounded by a mass of intermediate signal on T1- and T2-weighted images.

H. Urbach; B. Meyer; C. Cedzich; L. Solymosi

1995-01-01

284

Human Resources Administration: A School-Based Perspective. Fourth Edition  

ERIC Educational Resources Information Center

Enhanced and updated, this Fourth Edition of Richard E. Smith's highly successful text examines the growing role of the principal in planning, hiring, staff development, supervision, and other human resource functions. The Fourth Edition includes new sections on ethics, induction, and the role of the mentor teacher. This edition also introduces…

Smith, Richard

2009-01-01

285

Ohio Ag in the Classroom. Fourth Grade Curriculum Guide.  

ERIC Educational Resources Information Center

Adapted from Idaho's fourth grade agricultural education curriculum guide, this manual was created because there were insufficient resources available to Ohio students about the systems that provide human beings with food and fiber. Economically Ohio's largest industry, agriculture, serves as a basis for providing fourth-grade teachers with…

Ohio State Dept. of Agriculture, Columbus.

286

Fourth Annual Report The Climate, Water, and Carbon Program  

E-print Network

i Fourth Annual Report The Climate, Water, and Carbon Program A Targeted Investment in Excellence, and Carbon Program (CWC) is pleased to provide this Fourth Annual Report for review by OAA and OR. Accomplishments to Date Narrative .................................................. 2 III. Efforts to Address

Howat, Ian M.

287

Using Inquiry to Learn about Soil: A Fourth Grade Experience  

ERIC Educational Resources Information Center

In this article, we describe a fourth-grade inquiry unit on soil. The unit was designed and taught by preservice elementary teachers as part of a university science methods course. Using a student-driven inquiry approach to designing curriculum, the unit engaged fourth graders in learning about the physical properties soil, erosion, worms, and…

Magee, Paula A.; Wingate, Elisha

2014-01-01

288

Fourth North American Symposium on Assessing the Environmental  

E-print Network

Fourth North American Symposium on Assessing the Environmental Effects of Trade Phoenix / 23 April Fourth North American Symposium on Assessing the Environmental Effects of Trade (April 2008 08 R E S E A R C H P A P E R Environmental Implications of Trade Liberalization on North American

289

Toward a systematic analysis of the fourth-root trick  

E-print Network

In this note I briefly discuss ideas related to the so-called fourth-root trick. A decomposition of the ``rooted'' fermion effective action into Wilson fermions and a nonlocal, lattice spacing suppressed functional is presented, complete with link interactions. Some proposals are given for analytical, nonperturbative studies of the fourth-root trick.

Joel Giedt

2005-07-01

290

THE Fourth SHANGHAI INTERNATIONAL SYMPOSIUM ON NONLINEAR SCIENCES AND APPLICATIONS  

E-print Network

THE Fourth SHANGHAI INTERNATIONAL SYMPOSIUM ON NONLINEAR SCIENCES AND APPLICATIONS Shanghai NSA'10 for Papers The Fourth Shanghai International Symposium on Nonlinear Sciences and Applications (Shanghai NSA'10) will be held in Xuzhou and Shanghai on June 29-July 4, 2010. Shanghai NSA'10 is sponsored

Yang, Jianke

291

DISABILITY EQUALITY SCHEME: Fourth Annual Progress Report (2010-2011)  

E-print Network

1 DISABILITY EQUALITY SCHEME: Fourth Annual Progress Report (2010-2011) For copies of this report.................................................................................................... 2 2.2 Eliminating discrimination and promoting equality of opportunity.............................................................................................................. 11 #12;2 1. Introduction This is the fourth annual report on the University's Disability Equality

Henderson, Gideon

292

Familial aggregation of abdominal visceral fat level: Results from the Quebec family study  

Microsoft Academic Search

The purpose of this study was to investigate the importance of familial aggregation in abdominal visceral fat (AVF) level as assessed by computed tomography (CT). Four measures of abdominal adipose tissue, obtained from an abdominal scan between the fourth and fifth Lumbar vertebrae (L4-L5) taken in 366 adult subjects from 100 French-Canadian nuclear families, were considered in this study. Total

Louis Pérusse; J. P. Després; Simone Lemieux; Treva Rice; D. C. Rao; Claude Bouchard

1996-01-01

293

Measurement of Atmospheric Neutrino Oscillations with the ANTARES Neutrino Telescope  

E-print Network

The data taken with the ANTARES neutrino telescope from 2007 to 2010, a total live time of 863 days, are used to measure the oscillation parameters of atmospheric neutrinos. Muon tracks are reconstructed with energies as low as 20 GeV. Neutrino oscillations will cause a suppression of vertical upgoing muon neutrinos of such energies crossing the Earth. The parameters determining the oscillation of atmospheric neutrinos are extracted by fitting the event rate as a function of the ratio of the estimated neutrino energy and reconstructed flight path through the Earth. Measurement contours of the oscillation parameters in a two-flavour approximation are derived. Assuming maximum mixing, a mass difference of $\\Delta m_{32}^2=(3.1\\pm 0.9)\\cdot 10^{-3}$ eV$^2$ is obtained, in good agreement with the world average value.

ANTARES collaboration; S. Adrian-Martinez; I. Al Samarai; A. Albert; M. Andre; M. Anghinolfi; G. Anton; S. Anvar; M. Ardid; T. Astraatmadja; J. -J. Aubert; B. Baret; S. Basa; V. Bertin; S. Biagi; C. Bigongiari; C. Bogazzi; M. Bou-Cabo; B. Bouhou; M. C. Bouwhuis; J. Brunner; J. Busto; A. Capone; C. Carloganu; J. Carr; S. Cecchini; Z. Charif; Ph. Charvis; T. Chiarusi; M. Circella; R. Coniglione; L. Core; H. Costantini; P. Coyle; A. Creusot; C. Curtil; G. De Bonis; M. P. Decowski; I. Dekeyser; A. Deschamps; C. Distefano; C. Donzaud; D. Dornic; Q. Dorosti; D. Drouhin; T. Eberl; U. Emanuele; A. Enzenhoefer; J. -P. Ernenwein; S. Escoffier; K. Fehn; P. Fermani; M. Ferri; S. Ferry; V. Flaminio; F. Folger; U. Fritsch; J. -L. Fuda; S. Galata; P. Gay; K. Geyer; G. Giacomelli; V. Giordano; A. Gleixner; J. P. Gomez-Gonzalez; K. Graf; G. Guillard; G. Hallewell; M. Hamal; H. van Haren; A. J. Heijboer; Y. Hello; J. J. Hernandez-Rey; B. Herold; J. Hoessl; C. C. Hsu; M. de Jong; M. Kadler; O. Kalekin; A. Kappes; U. Katz; O. Kavatsyuk; P. Kooijman; C. Kopper; A. Kouchner; I. Kreykenbohm; V. Kulikovskiy; R. Lahmann; G. Lambard; G. Larosa; D. Lattuada; D. Lefevre; G. Lim; D. Lo Presti; H. Loehner; S. Loucatos; F. Louis; S. Mangano; M. Marcelin; A. Margiotta; J. A. Martinez-Mora; A. Meli; T. Montaruli; M. Morganti; L. Moscoso; H. Motz; M. Neff; E. Nezri; D. Palioselitis; G. E. Pavalas; K. Payet; J. Petrovic; P. Piattelli; V. Popa; T. Pradier; E. Presani; C. Racca; C. Reed; G. Riccobene; C. Richardt; R. Richter; C. Riviere; A. Robert; K. Roensch; A. Rostovtsev; J. Ruiz-Rivas; M. Rujoiu; G. V. Russo; D. F. E. Samtleben; A. Sanchez-Losa; P. Sapienza; J. Schmid; J. Schnabel; F. Schoeck; J. -P. Schuller; F. Schuessler; T. Seitz; R. Shanidze; F. Simeone; A. Spies; M. Spurio; J. J. M. Steijger; Th. Stolarczyk; M. Taiuti; C. Tamburini; A. Trovato; B. Vallage; C. Vallee; V. Van Elewyck; M. Vecchi; P. Vernin; E. Visser; S. Wagner; G. Wijnker; J. Wilms; E. de Wolf; H. Yepes; D. Zaborov; J. D. Zornoza; J. Zuniga

2012-07-02

294

Measurement of Atmospheric Neutrino Oscillations with the ANTARES Neutrino Telescope  

E-print Network

The data taken with the ANTARES neutrino telescope from 2007 to 2010, a total live time of 863 days, are used to measure the oscillation parameters of atmospheric neutrinos. Muon tracks are reconstructed with energies as low as 20 GeV. Neutrino oscillations will cause a suppression of vertical upgoing muon neutrinos of such energies crossing the Earth. The parameters determining the oscillation of atmospheric neutrinos are extracted by fitting the event rate as a function of the ratio of the estimated neutrino energy and reconstructed flight path through the Earth. Measurement contours of the oscillation parameters in a two-flavour approximation are derived. Assuming maximum mixing, a mass difference of $\\Delta m_{32}^2=(3.1\\pm 0.9)\\cdot 10^{-3}$ eV$^2$ is obtained, in good agreement with the world average value.

Adrian-Martinez, S; Albert, A; Andre, M; Anghinolfi, M; Anton, G; Anvar, S; Ardid, M; Astraatmadja, T; Aubert, J -J; Baret, B; Basa, S; Bertin, V; Biagi, S; Bigongiari, C; Bogazzi, C; Bou-Cabo, M; Bouhou, B; Bouwhuis, M C; Brunner, J; Busto, J; Capone, A; Carloganu, C; Carr, J; Cecchini, S; Charif, Z; Charvis, Ph; Chiarusi, T; Circella, M; Coniglione, R; Core, L; Costantini, H; Coyle, P; Creusot, A; Curtil, C; De Bonis, G; Decowski, M P; Dekeyser, I; Deschamps, A; Distefano, C; Donzaud, C; Dornic, D; Dorosti, Q; Drouhin, D; Eberl, T; Emanuele, U; Enzenhoefer, A; Ernenwein, J -P; Escoffier, S; Fehn, K; Fermani, P; Ferri, M; Ferry, S; Flaminio, V; Folger, F; Fritsch, U; Fuda, J -L; Galata, S; Gay, P; Geyer, K; Giacomelli, G; Giordano, V; Gleixner, A; Gomez-Gonzalez, J P; Graf, K; Guillard, G; Hallewell, G; Hamal, M; van Haren, H; Heijboer, A J; Hello, Y; Hernandez-Rey, J J; Herold, B; Hoessl, J; Hsu, C C; de Jong, M; Kadler, M; Kalekin, O; Kappes, A; Katz, U; Kavatsyuk, O; Kooijman, P; Kopper, C; Kouchner, A; Kreykenbohm, I; Kulikovskiy, V; Lahmann, R; Lambard, G; Larosa, G; Lattuada, D; Lefevre, D; Lim, G; Presti, D Lo; Loehner, H; Loucatos, S; Louis, F; Mangano, S; Marcelin, M; Margiotta, A; Martinez-Mora, J A; Meli, A; Montaruli, T; Morganti, M; Moscoso, L; Motz, H; Neff, M; Nezri, E; Palioselitis, D; Pavalas, G E; Payet, K; Petrovic, J; Piattelli, P; Popa, V; Pradier, T; Presani, E; Racca, C; Reed, C; Riccobene, G; Richardt, C; Richter, R; Riviere, C; Robert, A; Roensch, K; Rostovtsev, A; Ruiz-Rivas, J; Rujoiu, M; Russo, G V; Samtleben, D F E; Sanchez-Losa, A; Sapienza, P; Schmid, J; Schnabel, J; Schoeck, F; Schuller, J -P; Schuessler, F; Seitz, T; Shanidze, R; Simeone, F; Spies, A; Spurio, M; Steijger, J J M; Stolarczyk, Th; Taiuti, M; Tamburini, C; Trovato, A; Vallage, B; Vallee, C; Van Elewyck, V; Vecchi, M; Vernin, P; Visser, E; Wagner, S; Wijnker, G; Wilms, J; de Wolf, E; Yepes, H; Zaborov, D; Zornoza, J D; Zuniga, J

2012-01-01

295

Flavour-dependent radiative correction to neutrino-neutrino refraction  

E-print Network

In the framework of the Standard Model we calculate the flavour non-universal correction for neutrino refraction in a neutrino background and verify a similar previous result for the case of ordinary-matter background. The dominant term arises at loop level and involves tau leptons circulating in the loop. These O(G_F m_tau^2) corrections to the tree-level potential provide the dominant refractive difference between nu_mu and nu_tau unless the medium contains mu or tau leptons. Our results affect the flavour evolution of dense neutrino gases and may be of interest for collective three-flavour oscillations of supernova neutrinos. We spell out explicitly how these non-universal neutrino-neutrino interactions enter the flavour oscillation equations.

Alessandro Mirizzi; Stefano Pozzorini; Georg G. Raffelt; Pasquale D. Serpico

2009-10-08

296

High Energy Neutrinos: Sources and Fluxes  

E-print Network

We discuss briefly the potential sources of high energy astrophysical neutrinos and show estimates of the neutrino fluxes that they can produce. A special attention is paid to the connection between the highest energy cosmic rays and astrophysical neutrinos.

Todor Stanev

2005-11-22

297

Family History  

MedlinePLUS

... Complications Post Treatment and Outcome GTranslate Understanding : Family History Familial intracranial aneurysms are generally defined as the ... patients with an Intracranial Aneurysm (IA) have a history of smoking at some time in their life. ...

298

Family History  

MedlinePLUS

... Home CDC 24/7: Saving Lives. Protecting People.™ Genomics All CDC Topics Search The CDC Note: Javascript ... visit this page: About CDC.gov . Public Health Genomics Genomics Family Health History Share Compartir Family History ...

299

Neonatal hemifacial spasm and fourth ventricle mass.  

PubMed

Congential hemifacial spasm is a rare condition that is characterized by the occurrence of paroxysmal hemifacial contractions in neonates. We review the clinical, neurophysiological, neuroimaging, and histopathological findings, as well as the differential diagnosis, therapeutic approach, and outcome of all the described cases. Moreover, we report two new cases including the ictal video-electroencephalography recordings. Hemifacial spasm starts early in life, and is characterized by unilateral, involuntary, irregular tonic or clonic contractions of muscles innervated by the seventh cranial nerve. Hemifacial spasm is associated with eyelid blinking, and sometimes with breathing irregularities, hyperventilation, and/or other neurological manifestations (dystonic movements, nystagmus). Interictal and ictal video-electroencephalography did not reveal epileptiform abnormalities. In all cases, brain magnetic resonance imaging showed a mass involving the cerebellar peduncle, the cerebellar hemisphere, or the floor of the fourth ventricle. The semiology of the paroxysmal attacks is probably due to the activation of cranial nerve nuclei through intralesional hypersynchronous discharges, as shown by the intraoperative recordings and functional brain imaging described in the literature. We point out the importance of identifying such seizures in order to make an early diagnosis of the underlying cerebral lesion. PMID:22548445

Specchio, Nicola; Trivisano, Marina; Bernardi, Bruno; Marras, Carlo Efisio; Faggioli, Raffaella; Fiumana, Elisa; Cappelletti, Simona; Delalande, Olivier; Vigevano, Federico; Fusco, Lucia

2012-08-01

300

Testing solar lepton mixing sum rules in neutrino oscillation experiments  

NASA Astrophysics Data System (ADS)

Small discrete family symmetries such as S4, A4 or A5 may lead to simple leading-order predictions for the neutrino mixing matrix such as the bimaximal, tribimaximal or golden ratio mixing patterns, which may be brought into agreement with experimental data with the help of corrections from the charged-lepton sector. Such scenarios generally lead to relations among the parameters of the physical leptonic mixing matrix known as solar lepton mixing sum rules. In this article, we present a simple derivation of such solar sum rules, valid for arbitrary neutrino and charged lepton mixing angles and phases, assuming only ? {13/ ? } = ? {13/ e } = 0. We discuss four leading-order neutrino mixing matrices with ? {13/ ? } = 0 which are well motivated from family symmetry considerations. We then perform a phenomenological analysis of the scope to test the resulting four solar sum rules, highlighting the complementarity between next-generation neutrino oscillation experiments such as the reactor experiment JUNO and a superbeam experiment.

Ballett, Peter; King, Stephen F.; Luhn, Christoph; Pascoli, Silvia; Schmidt, Michael A.

2014-12-01

301

Status of global fits to neutrino oscillations  

Microsoft Academic Search

We review the present status of global analyses of neutrino oscillations, taking into account the most recent neutrino data including the latest KamLAND and K2K updates presented at Neutrino 2004, as well as state-of-the-art solar and atmospheric neutrino flux calculations. We give the two-neutrino solar + KamLAND results, and the two-neutrino atmospheric + K2K oscillation regions, discussing in each case

Michele Maltoni; Thomas Schwetz; Mariam Tórtola; José W. F. Valle

2004-01-01

302

Heavy sterile neutrinos and supernova explosions  

E-print Network

We consider sterile neutrinos with rest masses ~0.2 GeV. Such sterile neutrinos could augment core collapse supernova shock energies by enhancing energy transport from the core to the vicinity of the shock front. The decay of these neutrinos could produce a flux of very energetic active neutrinos, detectable by future neutrino observations from a galactic supernova. The relevant range of sterile neutrino masses and mixing angles can be probed in future laboratory experiments.

George M. Fuller; Alexander Kusenko; Kalliopi Petraki

2008-06-26

303

Collective flavour transitions of supernova neutrinos  

E-print Network

When the neutrino density is very high, as in core-collapse supernovae, neutrino-neutrino interactions are not negligible and can appreciably affect the evolution of flavour. The physics of these phenomena is briefly highlighted, and their effects are shown on observable energy spectra from a future galactic supernova within two-neutrino and three-neutrino frameworks. Detection of such effects could provide a handle on two unknowns: the neutrino mass hierarchy, and the mixing angle theta(13).

Irene Tamborra

2009-05-15

304

Tau Neutrinos at EeV Energies  

NASA Astrophysics Data System (ADS)

Astrophysical sources of ultrahigh energy neutrinos yield tau neutrino fluxes due to neutrino oscillations. At neutrino energies in the EeV range, radio Cherenkov detection methods show promise for detecting these fluxes. We quantify the tau neutrino contributions to the signal in, for example, a detector like the Radio Ice Cherenkov experiment (RICE) for a Z -burst flux prediction. Tau neutrino regeneration in transit through the Earth, including energy loss, is evaluated.

Hall Reno, M.; Dutta, S. Iyer; Mocioiu, I.; Reno, M.H.; Sarcevic, I.

2003-07-01

305

Searching for hep Neutrinos using the Sudbury Neutrino Observatory  

E-print Network

The Sudbury Neutrino Observatory has recently finished its third and final phase, and has accumulated over 1082 days of neutrino data, spanning the energy range from approximately 5-20 MeV. Almost all the observed neutrinos are due to the 8B reaction in the Sun. The so-called hep process (3He + p -> 4He + e + nu_e) also occurs in the Sun, but has not yet been observed. hep neutrino energy endpoint extends above the 8B spectrum. This paper describes the three phase analysis that will ultimately be the most sensitive to this reaction.

Chris Howard; for the SNO Collaboration

2009-05-29

306

Rural Families.  

ERIC Educational Resources Information Center

This "special focus" journal issue consists of 13 individual articles on the theme of rural family programs relating to school, health services, church, and other institutions. It includes: (1) "Towards a Rural Family Policy" (Judith K. Chynoweth and Michael D. Campbell); (2) "Montana: Council for Families Collaborates for Prevention (Jean…

Goetz, Kathy, Ed.

1992-01-01

307

Solar neutrino experiments: An update  

SciTech Connect

The situation in solar neutrino physics has changed drastically in the past few years, so that now there are four neutrino experiments in operation, using different methods to look at different regions of the solar neutrino energy spectrum. These experiments are the radiochemical {sup 37}Cl Homestake detector, the realtime Kamiokande detector, and the different forms of radiochemical {sup 71}Ga detectors used in the GALLEX and SAGE projects. It is noteworthy that all of these experiments report a deficit of observed neutrinos relative to the predictions of standard solar models (although in the case of the gallium detectors, the statistical errors are still relatively large). This paper reviews the basic principles of operation of these neutrino detectors, reports their latest results and discusses some theoretical interpretations. The progress of three realtime neutrino detectors that are currently under construction, SuperKamiok, SNO and Borexino, is also discussed.

Hahn, R.L.

1993-12-31

308

Burst Neutrinos from Nitrogen Flash  

E-print Network

Neutrinos give a novel probe to explore deep interior of astrophysical objects, which otherwise is not accessible with optical observations; among notable examples are solar and supernova neutrinos. We show that there is a new class of strong neutrino emission from helium burning, N + alpha --> 18F gamma followed by beta decay 18F --> 18O + e+ + nu_e, that gives a maximum neutrino luminosity of 10^8 times the solar bolometric luminosity at the helium-core flash of a 1 M_sun star, whereas the flash is not observable by optical means. This means that the neutrino flux, of average energy of 0.382 MeV, will be 10% the solar CNO neutrino flux on Earth if the star is located at 10pc.

A. M. Serenelli; M. Fukugita

2005-09-07

309

Probing Superluminal Neutrinos Via Refraction  

E-print Network

One phenomenological explanation of superluminal propagation of neutrinos, which may have been observed by OPERA and MINOS, is that neutrinos travel faster inside of matter than in vacuum. If so neutrinos exhibit refraction inside matter and should exhibit other manifestations of refraction, such as deflection and reflection. Such refraction would be easily detectable through the momentum imparted to appropriately shaped refractive material inserted into the neutrino beam. For NuMI this could be as large as ~10g cm/s. If these effect were found, they would provide new ways of manipulating and detecting neutrinos. Reasons why this scenario seems implausible are given, however it is still worthwhile to conduct simple searches for differential refraction of neutrinos.

Albert Stebbins

2011-10-12

310

Astrophysical and cosmological constraints to neutrino properties  

NASA Technical Reports Server (NTRS)

The astrophysical and cosmological constraints on neutrino properties (masses, lifetimes, numbers of flavors, etc.) are reviewed. The freeze out of neutrinos in the early Universe are discussed and then the cosmological limits on masses for stable neutrinos are derived. The freeze out argument coupled with observational limits is then used to constrain decaying neutrinos as well. The limits to neutrino properties which follow from SN1987A are then reviewed. The constraint from the big bang nucleosynthesis on the number of neutrino flavors is also considered. Astrophysical constraints on neutrino-mixing as well as future observations of relevance to neutrino physics are briefly discussed.

Kolb, Edward W.; Schramm, David N.; Turner, Michael S.

1989-01-01

311

Muon colliders and neutrino factories  

SciTech Connect

Over the last decade there has been significant progress in developing the concepts and technologies needed to produce, capture and accelerate {Omicron}(10{sup 21}) muons/year. This development prepares the way for a new type of neutrino source (Neutrino Factory) and a new type of very high energy lepton-antilepton collider (Muon Collider). This article reviews the motivation, design and R&D for Neutrino Factories and Muon Colliders.

Geer, S.; /Fermilab

2010-09-01

312

Neutrino Opacities in Nuclear Matter  

E-print Network

Neutrino-matter cross sections and interaction rates are central to the core-collapse supernova phenomenon and, very likely, to the viability of the explosion mechanism itself. In this paper, we describe the major neutrino scattering, absorption, and production processes that together influence the outcome of core collapse and the cooling of protoneutron stars. One focus is on energy redistribution and many-body physics, but our major goal is to provide a useful resource for those interested in supernova neutrino microphysics.

Adam Burrows; Sanjay Reddy; Todd A. Thompson

2004-04-21

313

MINOS Search for Sterile Neutrinos  

E-print Network

Using a NuMI beam exposure of 7.1 /times 10^20 protons-on-target, the MINOS long-baseline experiment has performed a search for active to sterile neutrino mixing over a distance of 735 km. Details of the analysis are provided, along with results from comparisons with standard three neutrino oscillations and fits to a 3+1 model including oscillations into one sterile neutrino. An outlook on the future sterile neutrino related contributions from MINOS and the proposed MINOS+ project is also presented.

Alexandre Sousa; on behalf of the MINOS Collaboration

2011-10-16

314

50 Years of Neutrino Physics  

E-print Network

Some important topics from history of neutrino physics over the last fifty years are discussed. History of neutrinos is older, at 4th December 2010 it will be eightieth anniversary of the "neutrino birth". In that day W. Pauli wrote the famous letter to participants of the physics conference at Tubingen with the suggestion that "there could exist in the nuclei electrically neutral particle". We will concentrate mostly on the 50 years of neutrino history just to show the long tradition of the Zakopane Theoretical School.

Marek Zralek

2010-12-10

315

Neutrino helicity asymmetries in leptogenesis  

E-print Network

It is pointed out that the heavy singlet neutrinos characteristic of leptogenesis develop asymmetries in the abundances of the two helicity states as a result of the same mechanism that generates asymmetries in the standard lepton sector. Neutrinos and standard leptons interchange asymmetries in collisions with each other. It is shown that an appropriate quantum number, B-L', combining baryon, lepton and neutrino asymmetries, is not violated as fast as the standard B-L. This suppresses the washout effects relevant for the derivation of the final baryon asymmetry. One presents detailed calculations for the period of neutrino thermal production in the framework of the singlet seesaw mechanism.

Luis Bento; Francisco C. Santos

2005-06-18

316

Neutrino helicity asymmetries in leptogenesis  

SciTech Connect

It is pointed out that the heavy singlet neutrinos characteristic of leptogenesis develop asymmetries in the abundances of the two helicity states as a result of the same mechanism that generates asymmetries in the standard lepton sector. Neutrinos and standard leptons interchange asymmetries in collisions with each other. It is shown that an appropriate quantum number, B-L{sup '}, combining baryon, lepton and neutrino asymmetries, is not violated as fast as the standard B-L. This suppresses the washout effects relevant for the derivation of the final baryon asymmetry. One presents detailed calculations for the period of neutrino thermal production in the framework of the singlet seesaw mechanism.

Bento, Luis; Santos, Francisco C. [Universidade de Lisboa, Faculdade de Ciencias, Centro de Fisica Nuclear da Universidade de Lisboa, Avenida Prof. Gama Pinto 2, 1649-003 Lisbon (Portugal)

2005-05-01

317

Proton and Neutrino Extragalactic Astronomy  

E-print Network

The study of extragalactic sources of high energy radiation via the direct measurement of the proton and neutrino fluxes that they are likely to emit is one of the main goals for the future observations of the recently developed air showers detectors and neutrino telescopes. In this work we discuss the relation between the inclusive proton and neutrino signals from the ensemble of all sources in the universe, and the resolved signals from the closest and brightest objects. We also compare the sensitivities of proton and neutrino telescopes and comment on the relation between these two new astronomies.

Paolo Lipari

2008-08-04

318

Supernova neutrinos and explosive nucleosynthesis  

SciTech Connect

Core-collapse supernovae eject huge amount of flux of energetic neutrinos. We studied the explosive nucleosyn-thesis in supernovae and found that several isotopes {sup 7}Li, {sup 11}B, {sup 92}Nb, {sup 138}La and {sup 180}Ta as well as r-process nuclei are affected by the neutrino interactions. The abundance of these isotopes therefore depends strongly on the neutrino flavor oscillation due to the Mikheyev-Smirnov-Wolfenstein (MSW) effect. We discuss first how to determine the neutrino temperatures in order to explain the observed solar system abundances of these isotopes, combined with Galactic chemical evolution of the light nuclei and the heavy r-process elements. We then study the effects of neutrino oscillation on their abundances, and propose a novel method to determine the still unknown neutrino oscillation parameters, mass hierarchy and ?{sub 13}, simultaneously. There is recent evidence that SiC X grains from the Murchison meteorite may contain supernova-produced light elements {sup 11}B and {sup 7}Li encapsulated in the presolar grains. Combining the recent experimental constraints on ?{sub 13}, we show that our method sug-gests at a marginal preference for an inverted neutrino mass hierarchy. Finally, we discuss supernova relic neutrinos that may indicate the softness of the equation of state (EoS) of nuclear matter as well as adiabatic conditions of the neutrino oscillation.

Kajino, T. [National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan and Department of Astronomy, Graduate School of Science, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033 (Japan); Aoki, W. [National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); Cheoun, M.-K. [Department of Physics, Soongsil University, Seoul 156-743 (Korea, Republic of); Hayakawa, T. [Japan Atomic Energy Agency, Shirakara-Shirane 2-4, Tokai-mura, Ibaraki 319-1195 (Japan); Hidaka, J.; Hirai, Y.; Shibagaki, S. [National Astronomical Observatory, 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); Mathews, G. J. [Center for Astrophysics, Department of Physics, University of Notre Dame, Notre Dame, IN 46556 (United States); Nakamura, K. [Faculty of Science and Engineering, Waseda University, Ohkubo 3-4-1, Shinjuku, Tokyo 169-8555 (Japan); Suzuki, T. [Department of Physics, College of Humanities and Sciences, Nihon University, Sakurajosui 3-25-40, Setagaya-ku, Tokyo 156-8550 (Japan)

2014-05-09

319

Neutrino clouds and dark matter  

SciTech Connect

We have examined the consequences of assuming the existence of a light scalar boson, weakly coupled to neutrinos, and not coupled to any other light fermions. For a range of parameters, we find that this hypothesis leads to the development of neutrino clusters which form in the early Universe and which provide gravitational fluctuations on scales small compared to a parsec (i.e., the scale of solar systems). Under some conditions, this can produce anomalous gravitational acceleration within solar systems and lead to a vanishing of neutrino mass-squared differences, giving rise to strong neutrino oscillation effects.

Goldman, T. [Los Alamos National Lab., NM (United States); McKellar, B.H.J. [Melbourne Univ., Parkville, VIC (Australia); Stephenson, G.J. Jr. [New Mexico Univ., Albuquerque, NM (United States)

1996-12-31

320

Combined search for the quarks of a sequential fourth generation  

DOE PAGESBeta

Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5??fb?1 recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about ±20??GeV . These results significantly reduce the allowed parameter space for a fourth generation of fermions.

Chatrchyan, S.; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Aguilo, E.; Bergauer, T.; Dragicevic, M.; Erö, J.; Fabjan, C.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hammer, J.; Hörmann, N.; Hrubec, J.; Jeitler, M.; Kiesenhofer, W.; Knünz, V.; Krammer, M.; Krätschmer, I.; Liko, D.; Mikulec, I.; Pernicka, M.; Rahbaran, B.; Rohringer, C.; Rohringer, H.; Schöfbeck, R.; Strauss, J.; Taurok, A.; Waltenberger, W.; Walzel, G.; Widl, E.; Wulz, C.-E.; Mossolov, V.; Shumeiko, N.; Suarez Gonzalez, J.; Bansal, M.; Bansal, S.; Cornelis, T.; De Wolf, E. A.; Janssen, X.; Luyckx, S.; Mucibello, L.; Ochesanu, S.; Roland, B.; Rougny, R.; Selvaggi, M.; Staykova, Z.; Van Haevermaet, H.; Van Mechelen, P.; Van Remortel, N.; Van Spilbeeck, A.; Blekman, F.; Blyweert, S.; D’Hondt, J.; Gonzalez Suarez, R.; Kalogeropoulos, A.; Maes, M.; Olbrechts, A.; Van Doninck, W.; Van Mulders, P.; Van Onsem, G. P.; Villella, I.; Clerbaux, B.; De Lentdecker, G.; Dero, V.; Gay, A. P. R.; Hreus, T.; Léonard, A.; Marage, P. E.; Mohammadi, A.; Reis, T.; Thomas, L.; Vander Marcken, G.; Vander Velde, C.; Vanlaer, P.; Wang, J.; Adler, V.; Beernaert, K.; Cimmino, A.; Costantini, S.; Garcia, G.; Grunewald, M.; Klein, B.; Lellouch, J.; Marinov, A.; Mccartin, J.; Ocampo Rios, A. A.; Ryckbosch, D.; Strobbe, N.; Thyssen, F.; Tytgat, M.; Verwilligen, P.; Walsh, S.; Yazgan, E.; Zaganidis, N.; Basegmez, S.; Bruno, G.; Castello, R.; Ceard, L.; Delaere, C.; du Pree, T.; Favart, D.; Forthomme, L.; Giammanco, A.; Hollar, J.; Lemaitre, V.; Liao, J.; Militaru, O.; Nuttens, C.; Pagano, D.; Pin, A.; Piotrzkowski, K.; Schul, N.; Vizan Garcia, J. M.; Beliy, N.; Caebergs, T.; Daubie, E.; Hammad, G. H.; Alves, G. A.; Correa Martins Junior, M.; De Jesus Damiao, D.; Martins, T.; Pol, M. E.; Souza, M. H. G.; Aldá Júnior, W. L.; Carvalho, W.; Custódio, A.; Da Costa, E. M.; De Oliveira Martins, C.; Fonseca De Souza, S.; Matos Figueiredo, D.; Mundim, L.; Nogima, H.; Oguri, V.; Prado Da Silva, W. L.; Santoro, A.; Soares Jorge, L.; Sznajder, A.; Anjos, T. S.; Bernardes, C. A.; Dias, F. A.; Tomei, T.R. Fernandez Perez; Gregores, E. M.; Lagana, C.; Marinho, F.; Mercadante, P. G.; Novaes, S. F.; Padula, Sandra S.; Genchev, V.; Iaydjiev, P.; Piperov, S.; Rodozov, M.; Stoykova, S.; Sultanov, G.; Tcholakov, V.; Trayanov, R.; Vutova, M.; Dimitrov, A.; Hadjiiska, R.; Kozhuharov, V.; Litov, L.; Pavlov, B.; Petkov, P.; Bian, J. G.; Chen, G. M.; Chen, H. S.; Jiang, C. H.; Liang, D.; Liang, S.; Meng, X.; Tao, J.; Wang, J.; Wang, X.; Wang, Z.; Xiao, H.; Xu, M.; Zang, J.; Zhang, Z.; Asawatangtrakuldee, C.; Ban, Y.; Guo, S.; Guo, Y.; Li, W.; Liu, S.; Mao, Y.; Qian, S. J.; Teng, H.; Wang, D.; Zhang, L.; Zhu, B.; Zou, W.; Avila, C.; Gomez, J. P.; Gomez Moreno, B.; Osorio Oliveros, A. F.; Sanabria, J. C.; Godinovic, N.; Lelas, D.; Plestina, R.; Polic, D.; Puljak, I.; Antunovic, Z.; Kovac, M.; Brigljevic, V.; Duric, S.; Kadija, K.; Luetic, J.; Morovic, S.; Attikis, A.; Galanti, M.; Mavromanolakis, G.; Mousa, J.; Nicolaou, C.; Ptochos, F.; Razis, P. A.; Finger, M.; Finger, M.; Assran, Y.; Elgammal, S.; Ellithi Kamel, A.; Khalil, S.; Mahmoud, M. A.; Radi, A.; Kadastik, M.; Müntel, M.; Raidal, M.; Rebane, L.; Tiko, A.; Eerola, P.; Fedi, G.; Voutilainen, M.; Härkönen, J.; Heikkinen, A.; Karimäki, V.; Kinnunen, R.; Kortelainen, M. J.; Lampén, T.; Lassila-Perini, K.; Lehti, S.; Lindén, T.; Luukka, P.; Mäenpää, T.; Peltola, T.; Tuominen, E.; Tuominiemi, J.; Tuovinen, E.; Ungaro, D.; Wendland, L.; Banzuzi, K.; Karjalainen, A.; Korpela, A.; Tuuva, T.; Besancon, M.; Choudhury, S.; Dejardin, M.; Denegri, D.; Fabbro, B.; Faure, J. L.; Ferri, F.; Ganjour, S.; Givernaud, A.; Gras, P.; Hamel de Monchenault, G.; Jarry, P.; Locci, E.; Malcles, J.; Millischer, L.; Nayak, A.; Rander, J.; Rosowsky, A.; Shreyber, I.; Titov, M.; Baffioni, S.; Beaudette, F.; Benhabib, L.; Bianchini, L.; Bluj, M.; Broutin, C.; Busson, P.; Charlot, C.; Daci, N.; Dahms, T.; Dobrzynski, L.; Granier de Cassagnac, R.; Haguenauer, M.; Miné, P.; Mironov, C.; Naranjo, I. N.; Nguyen, M.; Ochando, C.; Paganini, P.; Sabes, D.; Salerno, R.; Sirois, Y.; Veelken, C.; Zabi, A.; Agram, J.-L.; Andrea, J.; Bloch, D.; Bodin, D.; Brom, J.-M.; Cardaci, M.; Chabert, E. C.; Collard, C.; Conte, E.; Drouhin, F.; Ferro, C.; Fontaine, J.-C.; Gelé, D.; Goerlach, U.; Juillot, P.; Le Bihan, A.-C.; Van Hove, P.; Fassi, F.; Mercier, D.; Beauceron, S.; Beaupere, N.; Bondu, O.; Boudoul, G.; Chasserat, J.; Chierici, R.; Contardo, D.; Depasse, P.; El Mamouni, H.; Fay, J.; Gascon, S.; Gouzevitch, M.; Ille, B.; Kurca, T.; Lethuillier, M.; Mirabito, L.; Perries, S.; Sordini, V.; Tschudi, Y.; Verdier, P.; Viret, S.; Tsamalaidze, Z.; Anagnostou, G.; Beranek, S.; Edelhoff, M.; Feld, L.; Heracleous, N.; Hindrichs, O.; Jussen, R.; Klein, K.

2012-12-01

321

Combined search for the quarks of a sequential fourth generation  

E-print Network

Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5 inverse femtobarns recorded by the CMS experiment at the LHC in 2011. A novel strategy has been developed for a combined search for quarks of the up and down type in decay channels with at least one isolated muon or electron. Limits on the mass of the fourth-generation quarks and the relevant Cabibbo-Kobayashi-Maskawa matrix elements are derived in the context of a simple extension of the standard model with a sequential fourth generation of fermions. The existence of mass-degenerate fourth-generation quarks with masses below 685 GeV is excluded at 95% confidence level for minimal off-diagonal mixing between the third- and the fourth-generation quarks. With a mass difference of 25 GeV between the quark masses, the obtained limit on the masses of the fourth-generation quarks shifts by about +/- 20 GeV. These results significantly reduce the allowed parameter space for a fourth generation of fermions.

CMS Collaboration

2012-09-05

322

The Superior Transvelar Approach to the Fourth Ventricle and Brainstem  

PubMed Central

Objective?The superior transvelar approach is used to access pathologies located in the fourth ventricle and brainstem. The surgical path is below the venous structures, through the superior medullary velum. Following splitting the tentorial edge, near the tentorial apex, the superior medullary velum is split in the cerebello-mesencephalic fissure. Using the supracerebellar infratentorial, transtentorial or parietal interhemispheric routes, the superior medullary velum is approached. Splitting this velum provides a detailed view of the fourth ventricle and its floor. Materials and Methods?A total of 10 formalin-fixed specimens were dissected in a stepwise manner to simulate the superior transvelar approach to the fourth ventricle. The exposure gained the distance from the craniotomy site and the ease of access was assessed for each of the routes. We also present an illustrative case, operated by the senior author (AN). Results?The superior transvelar approach provides access to the entire length of the fourth ventricle floor, from the aqueduct to the obex, when using the parietal interhemispheric route. In addition, this approach provides access to the entire width of the floor of the fourth ventricle; however, this requires retracting the superior cerebellar peduncle. Using the supracerebellar infratentorial route gives a limited exposure of the superior part of the fourth ventricle. The occipital interhemispheric route is a compromise between these two. Conclusion?The superior transvelar approach to the fourth ventricle provides a route for approaching the fourth ventricle from above. This approach does not require opening the posterior fossa in the traditional way, and provides a reasonable alternative for accessing the superior fourth ventricle. PMID:23730546

Ezer, Haim; Banerjee, Anirban Deep; Bollam, Papireddy; Guthikonda, Bharat; Nanda, Anil

2012-01-01

323

Helioseismology and Beryllium neutrino  

E-print Network

We derive a lower limit on the Beryllium neutrino flux on earth, $\\Phi(Be)_{min} = 1\\cdot 10^9 cm^{-2} s^{-1}$, in the absence of oscillations, by using helioseismic data, the B-neutrino flux measured by Superkamiokande and the hydrogen abundance at the solar center predicted by Standard Solar Model (SSM) calculations. We emphasize that this abundance is the only result of SSMs needed for getting $\\Phi(Be)_{min}$. We also derive lower bounds for the Gallium signal, $G_{min}=(91 \\pm 3) $ SNU, and for the Chlorine signal, $C_{min}=(3.24\\pm 0.14)$ SNU, which are about $3\\sigma$ above their corresponding experimental values, $G_{exp}= (72\\pm 6)$ SNU and $C_{exp}= (2.56\\pm 0.22) $ SNU.

B. Ricci; F. L. Villante; M. Lissia

1999-04-06

324

Neutrinos in the Electron  

E-print Network

We will show that one half of the rest mass of the electron is equal to the sum of the rest masses of electron neutrinos and that the other half of the rest mass of the electron is given by the energy in the sum of electric oscillations. With this composition we can explain the rest mass, the electric charge, the spin and the magnetic moment of the electron.

E. L. Koschmieder

2005-03-28

325

Natural Neutrino Dark Energy  

SciTech Connect

1 construct a general description for neutrino dark energy models, that do not require exotic particles or strange couplings. With the help of the above, this class of models is reduced to a single function with several constraints. It is shown that these models lead to some concrete predictions that can be verified (or disproved) within the next decade, using results from PLANK, EUCLID and JDEM.

Gurwich, Ilya [Physics Department, Ben-Gurion University, Beer-Sheva 84105 (Israel)

2010-06-23

326

Birth of Neutrino Astrophysics  

ScienceCinema

Based mainly on the results of two experiments, KamiokaNDE and Super-KamiokaNDE, the birth of neutrino astrophysics will be described. At the end, the result of the third generation Kamioka experiment, KamLAND, will be discussed together with the future possibilities.Organiser(s): Daniel Treille / EP DivisionNote: * Tea & coffee will be served at 16:00 hrs. Please note unusual day.

None

2011-10-06

327

Birth of Neutrino Astrophysics  

SciTech Connect

Based mainly on the results of two experiments, KamiokaNDE and Super-KamiokaNDE, the birth of neutrino astrophysics will be described. At the end, the result of the third generation Kamioka experiment, KamLAND, will be discussed together with the future possibilities.Organiser(s): Daniel Treille / EP DivisionNote: * Tea & coffee will be served at 16:00 hrs. Please note unusual day.

None

2010-05-07

328

Observables in Neutrino Mass Spectroscopy Using Atoms  

E-print Network

The process of collective de-excitation of atoms in a metastable level into emission mode of a single photon plus a neutrino pair, called radiative emission of neutrino pair (RENP), is sensitive to the absolute neutrino mass scale, to the neutrino mass hierarchy and to the nature (Dirac or Majorana) of massive neutrinos. We investigate how the indicated neutrino mass and mixing observables can be determined from the measurement of the corresponding continuous photon spectrum taking the example of a transition between specific levels of the Yb atom. The possibility of determining the nature of massive neutrinos and, if neutrinos are Majorana fermions, of obtaining information about the Majorana phases in the neutrino mixing matrix, is analyzed in the cases of normal hierarchical, inverted hierarchical and quasi-degenerate types of neutrino mass spectrum. We find, in particular, that the sensitivity to the nature of massive neutrinos depends critically on the atomic level energy difference relevant in the RENP.

D. N. Dinh; S. T. Petcov; N. Sasao; M. Tanaka; M. Yoshimura

2012-09-21

329

Origin of giant viruses from smaller DNA viruses not from a fourth domain of cellular life.  

PubMed

The numerous and diverse eukaryotic viruses with large double-stranded DNA genomes that at least partially reproduce in the cytoplasm of infected cells apparently evolved from a single virus ancestor. This major group of viruses is known as Nucleocytoplasmic Large DNA Viruses (NCLDV) or the proposed order Megavirales. Among the "Megavirales", there are three groups of giant viruses with genomes exceeding 500kb, namely Mimiviruses, Pithoviruses, and Pandoraviruses that hold the current record of viral genome size, about 2.5Mb. Phylogenetic analysis of conserved, ancestral NLCDV genes clearly shows that these three groups of giant viruses have three distinct origins within the "Megavirales". The Mimiviruses constitute a distinct family that is distantly related to Phycodnaviridae, Pandoraviruses originate from a common ancestor with Coccolithoviruses within the Phycodnaviridae family, and Pithoviruses are related to Iridoviridae and Marseilleviridae. Maximum likelihood reconstruction of gene gain and loss events during the evolution of the "Megavirales" indicates that each group of giant viruses evolved from viruses with substantially smaller and simpler gene repertoires. Initial phylogenetic analysis of universal genes, such as translation system components, encoded by some giant viruses, in particular Mimiviruses, has led to the hypothesis that giant viruses descend from a fourth, probably extinct domain of cellular life. The results of our comprehensive phylogenomic analysis of giant viruses refute the fourth domain hypothesis and instead indicate that the universal genes have been independently acquired by different giant viruses from their eukaryotic hosts. PMID:25042053

Yutin, Natalya; Wolf, Yuri I; Koonin, Eugene V

2014-10-01

330

Probing neutrino mass hierarchies and $?_{13}$ with supernova neutrinos  

E-print Network

We investigate the feasibility of probing the neutrino mass hierarchy and the mixing angle $\\phi_{13}$ with the neutrino burst from a future supernova. An inverse power-law density $\\rho \\sim r^{n} $ with varying $n$ is adopted in the analysis as the density profile of a typical core-collapse supernova. The survival probabilities of $\

Shao-Hsuan Chiu; T. K. Kuo

2006-02-27

331

ON SOLAR NEUTRINO PROBLEM TIAN MA AND SHOUHONG WANG  

E-print Network

ON SOLAR NEUTRINO PROBLEM TIAN MA AND SHOUHONG WANG Abstract. The current neutrino oscillation an alternative resolution to the solar neutrino loss problem. Contents 1. Introduction 1 2. Discrepancy of Solar, there are three flavors of neutrinos: the electron neutrino e, the tau neutrino and the mu neutrino µ. The solar

332

Evidence of Electron Neutrino Appearance in a Muon Neutrino Beam  

E-print Network

The T2K collaboration reports evidence for electron neutrino appearance at the atmospheric mass splitting, |\\Delta m_{32}^2|=2.4x10^{-3} eV^2. An excess of electron neutrino interactions over background is observed from a muon neutrino beam with a peak energy of 0.6 GeV at the Super-Kamiokande (SK) detector 295 km from the beam's origin. Signal and background predictions are constrained by data from near detectors located 280 m from the neutrino production target. We observe 11 electron neutrino candidate events at the SK detector when a background of 3.3\\pm0.4(syst.) events is expected. The background-only hypothesis is rejected with a p-value of 0.0009 (3.1\\sigma), and a fit assuming \

Abgrall, N; Akiri, T; Albert, J B; Andreopoulos, C; Aoki, S; Ariga, A; Ariga, T; Assylbekov, S; Autiero, D; Barbi, M; Barker, G J; Barr, G; Bass, M; Batkiewicz, M; Bay, F; Bentham, S W; Berardi, V; Berger, B E; Berkman, S; Bertram, I; Beznosko, D; Bhadra, S; Blaszczyk, F d M; Blondel, A; Bojechko, C; Boyd, S; Brailsford, D; Bravar, A; Bronner, C; Brook-Roberge, D G; Buchanan, N; Calland, R G; Rodriguez, J Caravaca; Cartwright, S L; Castillo, R; Catanesi, M G; Cervera, A; Cherdack, D; Christodoulou, G; Clifton, A; Coleman, J; Coleman, S J; Collazuol, G; Connolly, K; Cremonesi, L; Curioni, A; Dabrowska, A; Danko, I; Das, R; Davis, S; Day, M; de Andre, J P A M; de Perio, P; De Rosa, G; Dealtry, T; Dennis, S; Densham, C; Di Lodovico, F; Di Luise, S; Dobson, J; Drapier, O; Duboyski, T; Dufour, F; Dumarchez, J; Dytman, S; Dziewiecki, M; Dziomba, M; Emery, S; Ereditato, A; Escudero, L; Finch, A J; Frank, E; Friend, M; Fujii, Y; Fukuda, Y; Furmanski, A; Galymov, V; Gaudin, A; Giffin, S; Giganti, C; Gilje, K; Golan, T; Gomez-Cadenas, J J; Gonin, M; Grant, N; Gudin, D; Hadley, D R; Haesler, A; Haigh, M D; Hamilton, P; Hansen, D; Hara, T; Hartz, M; Hasegawa, T; Hastings, N C; Hayato, Y; Hearty, C; Helmer, R L; Hierholzer, M; Hignight, J; Hillairet, A; Himmel, A; Hiraki, T; Hirota, S; Holeczek, J; Horikawa, S; Huang, K; Ichikawa, A K; Ieki, K; Ieva, M; Ikeda, M; Imber, J; Insler, J; Irvine, T J; Ishida, T; Ishii, T; Ives, S J; Iyogi, K; Izmaylov, A; Jacob, A; Jamieson, B; Johnson, R A; Jo, J H; Jonsson, P; Joo, K K; Jung, C K; Kaboth, A; Kaji, H; Kajita, T; Kakuno, H; Kameda, J; Kanazawa, Y; Karlen, D; Karpikov, I; Kearns, E; Khabibullin, M; Khanam, F; Khotjantsev, A; Kielczewska, D; Kikawa, T; Kilinski, A; Kim, J Y; Kim, J; Kim, S B; Kirby, B; Kisiel, J; Kitching, P; Kobayashi, T; Kogan, G; Kolaceke, A; Konaka, A; Kormos, L L; Korzenev, A; Koseki, K; Koshio, Y; Kowalik, K; Kreslo, I; Kropp, W; Kubo, H; Kudenko, Y; Kumaratunga, S; Kurjata, R; Kutter, T; Lagoda, J; Laihem, K; Laing, A; Laveder, M; Lawe, M; Lazos, M; Lee, K P; Licciardi, C; Lim, I T; Lindner, T; Lister, C; Litchfield, R P; Longhin, A; Lopez, G D; Ludovici, L; Macaire, M; Magaletti, L; Mahn, K; Malek, M; Manly, S; Marchionni, A; Marino, A D; Marteau, J; Martin, J F; Maruyama, T; Marzec, J; Masliah, P; Mathie, E L; Matveev, V; Mavrokoridis, K; Mazzucato, E; McCauley, N; McFarland, K S; McGrew, C; McLachlan, T; Messina, M; Metelko, C; Mezzetto, M; Mijakowski, P; Miller, C A; Minamino, A; Mineev, O; Mine, S; Missert, A; Miura, M; Monfregola, L; Moriyama, S; Mueller, Th A; Murakami, A; Murdoch, M; Murphy, S; Myslik, J; Nagasaki, T; Nakadaira, T; Nakahata, M; Nakai, T; Nakajima, K; Nakamura, K; Nakayama, S; Nakaya, T; Nakayoshi, K; Naples, D; Nicholls, T C; Nielsen, C; Nirkko, M; Nishikawa, K; Nishimura, Y; O'Keeffe, H M; Obayashi, Y; Ohta, R; Okumura, K; Okusawa, T; Oryszczak, W; Oser, S M; Otani, M; Owen, R A; Oyama, Y; Pac, M Y; Palladino, V; Paolone, V; Payne, D; Pearce, G F; Perevozchikov, O; Perkin, J D; Petrov, Y; Guerra, E S Pinzon; Plonski, P; Poplawska, E; Popov, B; Posiadala, M; Poutissou, J -M; Poutissou, R; Przewlocki, P; Quilain, B; Radicioni, E; Ratoff, P N; Ravonel, M; Rayner, M A M; Reeves, M; Reinherz-Aronis, E; Retiere, F; Robert, A; Rodrigues, P A; Rondio, E; Roth, S; Rubbia, A; Ruterbories, D; Sacco, R; Sakashita, K; Sanchez, F; Scantamburlo, E; Scholberg, K; Schwehr, J; Scott, M; Scully, D I; Seiya, Y; Sekiguchi, T; Sekiya, H; Sgalaberna, D; Shibata, M; Shiozawa, M; Short, S; Shustrov, Y; Sinclair, P; Smith, B; Smith, R J; Smy, M; Sobczyk, J T; Sobel, H; Sorel, M; Southwell, L; Stamoulis, P; Steinmann, J; Still, B; Suzuki, A; Suzuki, K; Suzuki, S Y; Suzuki, Y; Szeglowski, T; Szeptycka, M; Tacik, R; Tada, M; Takahashi, S; Takeda, A; Takeuchi, Y; Tanaka, H A; Tanaka, M M; Tanaka, M; Taylor, I J; Terhorst, D; Terri, R; Thompson, L F; Thorley, A; Tobayama, S; Toki, W; Tomura, T; Totsuka, Y; Touramanis, C; Tsukamoto, T; Tzanov, M; Uchida, Y; Ueno, K; Vacheret, A; Vagins, M; Vasseur, G; Wachala, T; Waldron, A V; Walter, C W; Wark, D; Wascko, M O; Weber, A; Wendell, R; Wilkes, R J; Wilking, M J; Wilkinson, C; Williamson, Z; Wilson, J R; Wilson, R J; Wongjirad, T; Yamada, Y; Yamamoto, K; Yanagisawa, C; Yen, S; Yershov, N; Yokoyama, M; Yuan, T; Zalewska, A; Zambelli, L; Zaremba, K; Ziembicki, M; Zimmerman, E D; Zito, M; Zmuda, J

2013-01-01

333

Bounds on neutrino magnetic moment tensor from solar neutrinos  

E-print Network

Solar neutrinos with non-zero magnetic moments will contribute to the electron scattering rates in the Super-Kamiokande experiment. The magnetic moment scattering events in Super-K can be accommodated in the standard VO or MSW solutions by a change of the parameter space of mass square difference and mixing angle-but the shifted neutrino parameters obtained from Super-K will (for some values of neutrino magnetic moments) become incompatible with the fits from SNO, Gallium and Chlorine experiments. We compute the upper bounds on the Dirac and Majorana magnetic moments of solar neutrinos by simultaneously fitting all the observed solar neutrino rates. The bounds the magnetic moment matrix elements are of the order of 10^{-10} Bohr magnetron.

Anjan S. Joshipura; Subhendra Mohanty

2002-06-05

334

OPERA, SN1987a and energy dependence of superluminal neutrino velocity  

E-print Network

This is a brief note discussing the energy dependence of superluminal neutrino velocities recently claimed by OPERA [1]. The analysis is based on the data provided there on this issue, as well as on consistency with neutrino data from SN1987a as recorded by the Kamioka detector [3]. It is seen that it is quite difficult to reconcile OPERA with SN1987a. Even the so called Coleman- Glashow dispersion relations do not do that well, if applied at all neutrino energies. The so called quantum gravity inspired dispersion relations perform far worse. Near OPERA energies a linear energy dependence with an offset that is comparable in value to the observed {\\delta}v by OPERA at 28.1 GeV works very well. Our analysis shows that precision arrival time data from SN1987a still allow for superluminal behaviour for supernova neutrinos. A smooth interpolation is given that reconciles OPERA and SN1987a quite well. It suggests a fourth power energy dependence for {\\delta}v of supernova c neutrinos. Suggestions are made for expe...

Dass, N D Hari

2011-01-01

335

THE DOMINANCE OF NEUTRINO-DRIVEN CONVECTION IN CORE-COLLAPSE SUPERNOVAE  

SciTech Connect

Multi-dimensional instabilities have become an important ingredient in core-collapse supernova (CCSN) theory. Therefore, it is necessary to understand the driving mechanism of the dominant instability. We compare our parameterized three-dimensional CCSN simulations with other buoyancy-driven simulations and propose scaling relations for neutrino-driven convection. Through these comparisons, we infer that buoyancy-driven convection dominates post-shock turbulence in our simulations. In support of this inference, we present four major results. First, the convective fluxes and kinetic energies in the neutrino-heated region are consistent with expectations of buoyancy-driven convection. Second, the convective flux is positive where buoyancy actively drives convection, and the radial and tangential components of the kinetic energy are in rough equipartition (i.e., K{sub r} {approx} K{sub {theta}} + K{sub {phi}}). Both results are natural consequences of buoyancy-driven convection, and are commonly observed in simulations of convection. Third, buoyant driving is balanced by turbulent dissipation. Fourth, the convective luminosity and turbulent dissipation scale with the driving neutrino power. In all, these four results suggest that in neutrino-driven explosions, the multi-dimensional motions are consistent with neutrino-driven convection.

Murphy, Jeremiah W.; Dolence, Joshua C.; Burrows, Adam, E-mail: jmurphy@astro.princeton.edu, E-mail: jdolence@astro.princeton.edu, E-mail: burrows@astro.princeton.edu [Princeton University, Princeton, NJ (United States)

2013-07-01

336

Familial glomerulonephritis.  

PubMed

Between 1970 and 1984, the diagnosis of glomerulonephritis was made in 860 patients on the basis of a nephritic sediment and/or renal biopsy; of these patients, 86 (10%) had at least one first-degree relative with glomerulonephritis. These patients originated from 45 families and 1674 family members were screened; 172 had glomerulonephritis, of whom 101 could be classified. The diagnostic breakdown of the 101 patients showed that 50.5% had classical Alport's syndrome; 21.8% had atypical forms; 17.8% had familial IgA glomerulonephritis; 1.9% had focal segmental glomerulosclerosis with Wolff-Parkinson-White syndrome; and 7.9% had benign familial haematuria. The proportion of patients with glomerulonephritis who had familial disease was higher than expected. The family history is an important point to consider in the examination of patients with glomerulonephritis. PMID:3153310

Rambausek, M; Hartz, G; Waldherr, R; Andrassy, K; Ritz, E

1987-07-01

337

Societal Implications of Fourth Generation Nanotechnology: Molecular Manufacturing  

E-print Network

Societal Implications of Fourth Generation Nanotechnology: Molecular Manufacturing Wednesday Nanotechnology (CRN) New York, NY Predictions for the future of nanotechnology range from the mundane that possibility seriously. Nanotechnology is sometimes called "the next Industrial Revolution," and with good

Fisher, Frank

338

Conformal relations and Hamiltonian formulation of fourth-order gravity  

E-print Network

The conformal equivalence of fourth-order gravity following from a non-linear Lagrangian L(R) to theories of other types is widely known, here we report on a new conformal equivalence of these theories to theories of the same type but with different Lagrangian. For a quantization of fourth-order theories one needs a Hamiltonian formulation of them. One of the possibilities to do so goes back to Ostrogradski in 1850. Here we present another possibility: A Hamiltonian H different from Ostrogradski's one is discussed for the Lagrangian L depending on first and second order drivatives of the position variable q. We add a suitable divergence to L. Contrary to other approaches no constraint is needed. One of the canonical equations becomes equivalent to the fourth-order Euler-Lagrange equation of L. Finally, we discuss the stability properties of cosmological models within fourth-order gravity.

H. -J. Schmidt

1997-12-29

339

The Nature of Fourth Graders' Understandings of Electric Circuits.  

ERIC Educational Resources Information Center

Two groups of four children each were involved in a qualitative study designed to interpret the nature of fourth graders' understandings of electric circuits. Conclusions regarding knowledge restructuring are presented as well as implications for teaching, assessment, and research. (ZWH)

Shepardson, Daniel P.; Moje, Elizabeth B.

1994-01-01

340

7. FOURTH FLOOR, DETAIL OF HOTEL SOAP LINE TO WEST: ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. FOURTH FLOOR, DETAIL OF HOTEL SOAP LINE TO WEST: FERGUSON & HAAS AUTOMATIC WRAPPING MACHINE INSTALLED BY 1929 - Colgate & Company Jersey City Plant, Building No. B-15, 90-96 Greene Street, Jersey City, Hudson County, NJ

341

View of fourth level platform from north. Note the outline ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of fourth level platform from north. Note the outline of the Shuttle cargo bay and wing formed by the edge of the platforms. - Marshall Space Flight Center, Saturn V Dynamic Test Facility, East Test Area, Huntsville, Madison County, AL

342

Detail view of fourth level platform winch used to lift ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail view of fourth level platform winch used to lift platform segments away from the Shuttle assembly during testing. - Marshall Space Flight Center, Saturn V Dynamic Test Facility, East Test Area, Huntsville, Madison County, AL

343

21. Fourth floor, second level of milk room looking southeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

21. Fourth floor, second level of milk room looking southeast (original location of heaters) - Sheffield Farms Milk Plant, 1075 Webster Avenue (southwest corner of 166th Street), Bronx, Bronx County, NY

344

31. Fourth floor, looking south at former milkstorage tank room, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

31. Fourth floor, looking south at former milk-storage tank room, spiral stair in right hand corner - Sheffield Farms Milk Plant, 1075 Webster Avenue (southwest corner of 166th Street), Bronx, Bronx County, NY

345

Combined search for the quarks of a sequential fourth generation  

E-print Network

Results are presented from a search for a fourth generation of quarks produced singly or in pairs in a data set corresponding to an integrated luminosity of 5??fb[superscript -1] recorded by the CMS experiment at the LHC ...

Apyan, Aram

346

30. GENERAL TEST ROOM IN 1946 ADDITION, FOURTH FLOOR, LOOKING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

30. GENERAL TEST ROOM IN 1946 ADDITION, FOURTH FLOOR, LOOKING WEST. ORIGINALLY HAD SUSPENDED ACOUSTICAL CEILINGS WITH FLOURESCENT LIGHTING AND ASPHALT MASTIC TILE FLOORS - Underwriters' Laboratories, 207-231 East Ohio Street, Chicago, Cook County, IL

347

Using Fourth Generation Language to Develop and Monitor the Budget.  

ERIC Educational Resources Information Center

Describes the implementation of a FOCUS, a fourth-generation language (4GL) database management system for the St. Louis (Missouri) Public Schools, that allows for the analysis of individual department or school files and the districtwide file. (MLF)

Wallace, Walter R.

1988-01-01

348

Man and Energy, Module C. Fourth Grade. Pilot Form.  

ERIC Educational Resources Information Center

This booklet is one of a set of learning modules on energy for use by students and teachers in the fourth grade. This module investigates solar energy, ecology, and fossil fuels. Included are laboratory activities and values exercises. (BT)

Pasco County Schools, Dade City, FL.

349

12. FOURTH FLOOR ROASTING ROOM (NOW TIRE STORAGE). VIEW TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

12. FOURTH FLOOR ROASTING ROOM (NOW TIRE STORAGE). VIEW TO SOUTH. - Commercial & Industrial Buildings, McFadden Coffee & Spice Company, Factory & Warehouse, 145 First Street, Dubuque, Dubuque County, IA

350

John Street (South) Elevation (Second through Fourth Floors, Terra Cotta ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

John Street (South) Elevation (Second through Fourth Floors, Terra Cotta detailed window surrounds at the corner of John Street and Broadway) - View from rooftop of 10 John Street - Corbin Building, 11 John Street, New York, New York County, NY

351

John Street (South) Elevation (Fourth through Sixth Floors, Terra Cotta ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

John Street (South) Elevation (Fourth through Sixth Floors, Terra Cotta detailed window surrounds at the corner of John Street and Broadway) - View from rooftop of 10 John Street - Corbin Building, 11 John Street, New York, New York County, NY

352

Proceedings of the Fourth PHANTOM Users Group Workshop  

E-print Network

This Report contains the proceedings of the Fourth Phantom Users Group Workshop contains 17 papers presented October 9-12, 1999 at MIT Endicott House in Dedham Massachusetts. The workshop included sessions on, Tools ...

Salisbury, J. Kenneth

1999-11-04

353

Is There a Massive Neutrino?  

ERIC Educational Resources Information Center

Discussed is the question of whether "heavy" neutrinos really do exist based on the evidence supplied by four research groups. The implications of its existence on the disciplines of particle physics, astrophsyics, and cosmology are discussed. Background information on the different types of neutrinos is provided. (KR)

Selvin, Paul

1991-01-01

354

The Mass of the Neutrinos  

E-print Network

In the theory of the Dirac equation and in the standard model, the neutrino is massless. Both these theories use Lorentz invariance. In modern approaches however, spacetime is no longer smooth, and this modifies special relativity. We show how such a modification throws up the mass of the neutrino.

Burra G. Sidharth

2009-04-23

355

Neutrino astronomy and lepton charge  

Microsoft Academic Search

It is shown that lepton nonconservation might lead to a decrease in the number of detectable solar neutrinos at the earth surface, because of nue<--numu oscillations, similar to Ko<--K~o oscillations. Equations are presented describing such oscillations for the case when there exist only four neutrino states.

V. Gribov; B. Pontecorvo

1969-01-01

356

Observation of Geo-Neutrinos  

E-print Network

Geo-neutrinos, electron anti-neutrinos produced in beta decays of naturally occurring radioactive isotopes in the Earth, are a unique direct probe of our planet's interior. We report the first observation at more than 3$\\sigma$ C.L. of geo-neutrinos, performed with the Borexino detector at Laboratori Nazionali del Gran Sasso. Anti-neutrinos are detected through the neutron inverse beta decay reaction. With a 252.6 ton-yr fiducial exposure after all selection cuts, we detected 9.9^{+4.1}_{-3.4}(^{+14.6}_{-8.2}) geo-neutrino events, with errors corresponding to a 68.3%(99.73%) C.L. From the $\\ln{\\cal{L}}$ profile, the statistical significance of the Borexino geo-neutrino observation corresponds to a 99.997% C.L. Our measurement of the geo-neutrinos rate is 3.9^{+1.6}_{-1.3}(^{+5.8}_{-3.2}) events/(100ton-yr). This measurement rejects the hypothesis of an active geo-reactor in the Earth's core with a power above 3 TW at 95% C.L. The observed prompt positron spectrum above 2.6 MeV is compatible with that expected from european nuclear reactors (mean base line of approximately 1000 km). Our measurement of reactor anti-neutrinos excludes the non-oscillation hypothesis at 99.60% C.L.

Borexino Collaboration

2010-03-01

357

Beta Beams for Neutrino Production  

Microsoft Academic Search

This paper gives an overview of the work done so far to produce sufficient neutrino fluxes for neutrino oscillation physics using beta beams. The design study on a beta beam scenario, the EURISOL (European Isotope Separation On-Line Radioactive Ion Beam Facility) Design Study, a project funded by the European Commission (EC), is now ready to be published. The study is

Elena Wildner; Elena

2010-01-01

358

Neutrino exploration of the earth  

NASA Astrophysics Data System (ADS)

We show how the neutrinos produced by a multi-TeV proton synchotron may be used for purposes of geological research. Project GENIUS (geological exploration by neutrino-induced underground sound) is designed to search for deposits of oil and gas at large distances from the accelerator. It depends upon the coherent sound signal produced at depth by millions of neutrino interactions along the underground neutrino beam. Surface measurements of the acoustic pulse provide a remote underground probe. Project GEMINI (geological exploration with muons induced by neutrino interactions) is designed to search for distant deposits of high- Z ores. It depends upon the surface measurement of neutrino-induced muons which were produced in the last few kilometers of the neutrinos' underground voyage. Project GEOSCAN is a flux-independent procedure to determine the vertical density profile of the Earth, and especially its core. It depends upon the angle and energy dependence of the attenuation as the neutrino beam traverses the whole Earth.

De Rújula, A.; Glashow, S. L.; Wilson, R. R.; Charpak, G.

1983-10-01

359

High energy neutrinos from quasars  

Microsoft Academic Search

We review and clarify the assumptions of our basic model for neutrino production in the cores of quasars, as well as those modifications to the model made subsequently by other workers. We also present a revised estimate of the neutrino background flux and spectrum obtained using more recent empirical studies of quasars and their evolution. We compare our results with

F. W. Stecker; M. H. Salamon

1996-01-01

360

India-based Neutrino Observatory  

NASA Astrophysics Data System (ADS)

An introduction to India-based Neutrino Observatory and a brief status report are presented.The two possible sites are described along with their special advantages.The proposed detector and its physics capabilities for atmospheric neutrinos and long-base-line experiments are discussed.

Rajasekaran, G.

2004-10-01

361

Estimating Size and Effort in Fourth-Generation Development  

Microsoft Academic Search

The authors report on the building of an information system for a correspondence school with both many students and many types of students, for which they recommended a fourth-generation-language approach. Because they were sceptical about the massive productivity gains claimed for fourth-generation-language development, and because they did not know exactly where the savings would be, they collected data on the

June M. Verner; Graham Tate

1988-01-01

362

Big World of Small Neutrinos Hitoshi Murayama  

E-print Network

Big World of Small Neutrinos Hitoshi Murayama UC Berkeley / LBNL Harvard, Dec 9, 2002 #12;Harvard colloquium 2 Neutrinos are Everywhere #12;Harvard colloquium 3 "Wimpy and Abundant" Neutrinos are Everywhere · They come from the Big Bang: ­ When the Universe was hot, neutrinos were created equally with any other

Murayama, Hitoshi

363

Theory of neutrinos: a white paper  

Microsoft Academic Search

This paper is a review of the present status of neutrino mass physics, which grew out of an APS sponsored study of neutrinos in 2004. After a discussion of the present knowledge of neutrino masses and mixing and some popular ways to probe the new physics implied by recent data, it summarizes what can be learned about neutrino interactions as

R. N. Mohapatra; S. Antusch; K. S. Babu; G. Barenboim; M.-C. Chen; A. de Gouvêa; P. de Holanda; B. Dutta; Y. Grossman; A. Joshipura; B. Kayser; J. Kersten; Y. Y. Keum; S. F. King; P. Langacker; M. Lindner; W. Loinaz; I. Masina; I. Mocioiu; S. Mohanty; H. Murayama; S. Pascoli; S. T. Petcov; A. Pilaftsis; P. Ramond; M. Ratz; W. Rodejohann; R. Shrock; T. Takeuchi; T. Underwood; L. Wolfenstein

2007-01-01

364

Thermodynamic Laws of Neutrino and Photon Emission.  

ERIC Educational Resources Information Center

Compares neutrino and photon emissions, develops the thermodynamic blackbody laws of neutrino emission analogous to laws governing photon emission, points out that combined radiation from a "true blackbody" consists of both photon and neutrino emissions of comparable magnitude, and speculates upon the existence of blackbody neutrino emitters in…

Walsh, P. J.; Gallo, C. F.

1980-01-01

365

Double Beta Decay and Majorana Neutrino  

Microsoft Academic Search

This review consists of three parts: Various properties of the quantized neutrino fields are summarized in part I from the viewpoint that a Dirac neutrino consists of two Majorana neutrinos with a degenerate mass but with opposite CP sings. It is shown why the Dirac neutrino has a freedom of the phase transformation to guarantee the lepton number conservation, while

Masaru Doi; Tsuneyuki Kotani; Eiichi Takasugi

1985-01-01

366

Ultra- and extremely high energy neutrino astronomy  

E-print Network

Scientific motivations for ultra- and extremely high energy neutrino astronomy are considered. Sources and expected fluxes of EHE/UHE neutrinos are briefly discussed. Operating and planned experiments on astrophysical neutrino detection are reviewed focusing on deep underwater/ice Cherenkov neutrino telescopes.

I. Sokalski

2005-01-05

367

Search for excited neutrinos in Z decay  

Microsoft Academic Search

Excited neutrinos decaying into a neutrino and a photon are searched for in the ALEPH detector at LEP. No evidence is found for Z decay into v¯v* or v¯*v* final states. Upper limits are derived on excited neutrino couplings up to excited neutrino masses close to the Z mass. Lower limits on the v* mass, independent of the v* decay

D. Decamp; B. Deschizeaux; C. Goy; J.-P. Lees; M.-N. Minard; R. Alemany; J. M. Crespo; M C Delfino; E. Fernandez; V. Gaitan; Ll. Garrido; P. Mato; R. Miguel; Ll. M. Mir; S. Orteu; A. Pacheco; J. A. Perlas; E. Tubau; M. G. Catanesi; D. Creanza; M. de Palma; A. Farilla; G. Iaselli; G. Maggi; M. Maggi; S. Natali; S. Nuzzo; M. Quattromini; A. Ranieri; G. Raso; F Ruggieri; G. Selvaggi; L. Silvestris; P. Tempesta; G. Zito; Y. S. Gao; H. Hu; D. Huang; S. Jin; J. Lin; T. Ruan; T. Wang; W. Wu; Y. Xie; D. Xu; R. Xu; J. Zhang; W. Zhao; W. B. Atwood; F. Bird; E. Blucher; G. Bonvicini; F. Bossi; J. Bourotte; D. Brown; T. H. Burnett; H. Drevermann; Friedrich Dydak; R. W. Forty; C. Grab; R. Hagelberg; S. Haywood; B. Jost; M. Kasemann; G. Kellner; J. Knobloch; A. Lacourt; I. Lehraus; T. Lohse; A. Marchioro; M. Martinez; S. Menary; A. Minten; A. Miotto; J. Nash; P. Palazzi; F. Ranjard; G. Redlinger; A. Roth; J. Rothberg; H. Rotscheidt; W. von Rüden; R. St. Denis; D. Schlatter; M. Takashima; M. Talby; H. Taureg; W. Tejessy; H. Wachsmuth; S. Wasserbaech; S. Wheeler; W. Wiedenmann; W. Witzeling; J. Wotschack; Z. Ajaltouni; M. Bardadin-Otwinowska; A. Falvard; R. El Fellous; P. Gay; P. Henrard; J. Jousset; B. Michel; J.-C. Montret; D. Pallin; P. Perret; J. Proriol; F. Prulhière; J. D. Hansen; J. R. Hansen; P. H. Hansen; R. Møllerud; B. S. Nilsson; G. Petersen; I. Efthymiopoulos; E. Simopoulou; A. Vayaki; J. Badier; A. Blondel; G. Bonneaud; F. Braems; J. C. Brient; G. Fouque; A. Gamess; R. Guirlet; A. Rosowsky; A. Rougé; M. Rumpf; R. Tanaka; H. Videau; I. Videau; D. J. Candlin; G. Parrini; M. Corden; C. Georgiopoulos; M. Ikeda; J. Lannutti; D. Levinthal; M. Mermikides; L. Sawyer; G. Stimpfl; A. Antonelli; R. Baldini; G. Bencivenni; G. Bologna; P. Campana; G. Capon; V. Chiarella; B. D'Ettorre-Piazzoli; G. Felici; P. Laurelli; G. Mannocchi; F. Massimo-Brancacci; F. Murtas; G. P. Murtas; G. Nicoletti; M. Pepe-Altarelli; P. Picchi; P. Zografou; B. Altoon; O. Boyle; A. W. Halley; I. Ten Have; J. L. Hearns; J. G. Lynch; W. T. Morton; C. Raine; J. M. Scarr; K. Smith; A. S. Thompson; B. Brandl; O. Braun; R. Geiges; C. Geweniger; P. Hanke; V. Hepp; E. E. Kluge; Y. Maumary; A. Putzer; B. Rensch; A. Stahl; K. Tittel; M. Wunsch; A. T. Belk; R. Beuselinck; D. M. Binnie; W. Cameron; M. Cattaneo; P. J. Dornan; S. Dugeay; A. M. Greene; J. F. Hassard; S. J. Patton; J. K. Sedgbeer; G. Taylor; I. R. Tomalin; A. G. Wright; P. Girtler; D. Kuhn; G. Rudolph; C. K. Bowdery; T. J. Brodbeck; A. J. Finch; F. Foster; G. Hughes; N. R. Keemer; M. Nuttall; B. S. Rowlingson; T. Sloan; S. W. Snow; T. Barczewski; L. A. T. Bauerdick; K. Kleinknecht; B. Renk; S. Roehn; H.-G. Sander; M. Schmelling; F. Steeg; J.-P. Albanese; J.-J. Aubert; C. Benchouk; V. Bernard; A. Bonissent; D. Courvoisier; F. Etienne; S. Papalexiou; P. Payre; B. Pietrzyk; Z. Qian; W. Blum; P. Cattaneo; G. Cowan; B. Dehning; H. Dietl; M. Fernandez-Bosman; A. Jahn; E. Lange; G. Lütjens; G. Lutz; W. Männer; H.-G. Moser; Y. Pan; R. Richter; A. S. Schwarz; R. Settles; U. Stiegler; U. Stierlin; J. Thomas; V. Bertin; G. de Bouard; J. Boucrot; O. Callot; X. Chen; A. Cordier; M. Davier; G. Ganis; J.-F. Grivaz; Ph. Heusse; P. Janot; V. Journé; D. W. Kim; J. Lefrançois; A.-M. Lutz; J.-J. Veillet; Z. Zhang; F. Zomer; S. R. Amendolia; G. Bagliesi; G. Batignani; L. Bosisio; U. Bottigli; C. Bradaschia; M. A. Ciocci; I. Ferrante; F. Fidecaro; L. Foà; E. Focardi; F. Forti; A. Giassi; M. A. Giorgi; F. Ligabue; A. Lusiani; E. B. Mannelli; P. S. Marrocchesi; A. Messineo; F. Palla; G. Sanguinetti; J. Steinberger; R. Tenchini; G Triggiani; J. M. Carter; M. G. Green; P. V. March; T. Medcalf; M. R. Saich; J. A. Strong; R. M. Thomas; T. Wildish; D. R. Botterill; R. W. Clifft; T. R. Edgecock; M. Edwards; S. M. Fisher; J. Harvey; T. J. Jones; P. R. Norton; D. P. Salmon; J. C. Thompson; B. Bloch-Devaux; P. Colas; C. Klopfenstein; E. Lançon; E. Locci; S. Loucatos; L. Mirabito; E. Monnier; P. Perez; F. Perrier; J. Rander; J.-F. Renardy; A. Roussarie; J.-P. Schuller; J. G. Ashman; C. N. Booth; F. Combley; M. Dinsdale; J. Martin; D. Parker; L. F. Thompson; S. Brandt; H. Burkhardt; C. Grupen; H. Meinhard; E. Neugebauer; U. Schäfer; H. Seywerd; G. Apollinari; G. Giannini; B. Gobbo; F. Liello; E. Milotti; L. Rolandi; L. Bellantoni; J. F. Boudreau; D. Cinabro; J. S. Conway; D. F. Cowen; A. J. Deweerd; Z. Feng; D. P. S. Ferguson; J. L. Harton; J. Hilgart; J. E. Jacobsen; R. C. Jared; R. P. Johnson; B. W. Leclaire; T. Parker; J. R. Pater; Y. Saadi; V. Sharma; J. A. Wear; F. V. Weber; Sau Lan Wu; G. Zobernig

1990-01-01

368

Geo-neutrinos: recent developments  

E-print Network

Radiogenic heating is a key component of the energy balance and thermal evolution of the Earth. It contributes to mantle convection, plate tectonics, volcanoes, and mountain building. Geo-neutrino observations estimate the present radiogenic power of our planet. This estimate depends on the quantity and distribution of heat-producing elements in various Earth reservoirs. Of particular geological importance is radiogenic heating in the mantle. This quantity informs the origin and thermal evolution of our planet. Here we present: currently reported geo-neutrino observations; estimates of the mantle geo-neutrino signal, mantle radiogenic heating, and mantle cooling; a comparison of chemical Earth model predictions of the mantle geo-neutrino signal and mantle radiogenic heating; a brief discussion of radiogenic heating in the core, including calculations of geo-neutrino signals per pW/kg; and finally a discussion of observational strategy.

Dye, Steve

2014-01-01

369

Neutrinos Get Under Your Skin  

SciTech Connect

The enigmatic neutrinos are among the most abundant of the tiny particles that make up our universe. They are a billion times more abundant than the particles of which the earth and we humans are made. Thus, to understand the universe, we must understand the neutrinos. Moving ghostlike, almost invisibly, through matter, these particles are very hard to pin down and study. However, dramatic progress has recently been made. In this lecture, the neutrinos will be introduced. Their behavior, so different from that of everyday objects, will be explained, and recent discoveries will be described. The open questions about neutrinos, forthcoming attempts to answer these questions, and the role of neutrinos in shaping the universe and making human life possible, will all be explained.

Kayser, Boris

2005-08-30

370

Supernova observations for neutrino mixing parameters  

SciTech Connect

The neutrino spectra from a future galactic core collapse supernova could reveal information on the neutrino mixing pattern, especially on {theta}{sub 13} and the mass hierarchy. I briefly outline our current understanding of neutrino flavor conversions inside a supernova, and point out possible signatures of various neutrino mixing scenarios that the neutrino detectors should look for. Supernova neutrinos provide a probe for {theta}{sub 13} and mass hierarchy that is complementary to, and sometimes even better than, the current and proposed terrestrial neutrino oscillation experiments.

Dighe, Amol [Department of Theoretical Physics, Tata Institute of Fundamental Research, 1, Homi Bhabha Road, Colaba, Mumbai 400005 (India)

2011-10-06

371

Family Potyviridae  

Technology Transfer Automated Retrieval System (TEKTRAN)

The International Committee on the Taxonomy of Viruses potyvirus study group has revised the description of the family Potyviridae for inclusion in the ICTV 9th report. Characteristic features of each genus within the family is presented. Revised criteria for demarcation and nomenclature of viral sp...

372

FAMILY GEMINIVIRIDAE  

Technology Transfer Automated Retrieval System (TEKTRAN)

The International Committee on the Taxonomy of Viruses geminivirus study group has revised the description of the family Geminiviridae for inclusion in the ICTV 8th report. Characteristic features of each genus within the family is presented. Revised criteria for demarcation and nomenclature of vi...

373

Family Workshops  

ERIC Educational Resources Information Center

A Family Workshop is an informal, multidisciplined educational program for adults and children, organized by a team of teachers. This article discusses the Lavender Hill Family Workshop, one of many, which attempts to provide education in various subject areas for adults and for children while also integrating both objectives in order to educate…

Bennett, Dave; Rees-Jones, Tanny

1978-01-01

374

Family Life.  

ERIC Educational Resources Information Center

Focuses on various aspects of mammal family life ranging from ways different species are born to how different mammals are raised. Learning activities include making butter from cream, creating birth announcements for mammals, and playing a password game on family life. (ML)

Naturescope, 1986

1986-01-01

375

FAMILY POTYVIRIDAE  

Technology Transfer Automated Retrieval System (TEKTRAN)

The International Committee on the Taxonomy of Viruses potyvirus study group has revised the description of the family Geminiviridae for inclusion in the ICTV 8th report. Characteristic features of each genus within the family is presented. Revised criteria for demarcation and nomenclature of vira...

376

Familial glomerulonephritis  

Microsoft Academic Search

Between 1970 and 1984, the diagnosis of glomerulonephritis was made in 860 patients on the basis of a nephritic sediment and\\/or renal biopsy; of these patients, 86 (10%) had at least one first-degree relative with glomerulonephritis. These patients originated from 45 families and 1674 family members were screened; 172 had glomerulonephritis, of whom 101 could be classified. The diagnostic breakdown

Michael Rambausek; Georg Hartz; Rüdiger Waldherr; Konrad Andrassy; Eberhard Ritz

1987-01-01

377

Double neutrino production and detection in neutrino detectors  

NASA Astrophysics Data System (ADS)

Large, high-energy (E>100GeV) cosmic neutrino telescopes are now quite mature. IceCube, for example, observes about 50 000 well-reconstructed single atmospheric neutrino events/year, with energies above 100 GeV. Although the neutrino detection probability is small, current detectors are large enough so that it is possible to detect two neutrinos from the same cosmic-ray interaction. In this paper, we calculate the expected rate of double-neutrino interactions from a single cosmic-ray air shower. The rate is small, about 0.07events/year for a 1km3 detector like IceCube, with only a small dependence on the assumed cosmic-ray composition and hadronic interaction model. For a larger detector, like the proposed KM3Net, the rate is about 0.8events/year, high enough to be easily observable. These double neutrino interactions are the major irreducible background to searches for pairs of supersymmetric particles produced in neutrino or cosmic-ray air-shower interactions. Other standard model backgrounds are considered, and found to be small.

van der Drift, Don; Klein, Spencer R.

2013-08-01

378

Energy Dependence of Solar Neutrino Suppression and Bounds on the Neutrino Magnetic Moment  

E-print Network

An analysis of neutrino electron scattering as applied to the SuperKamiokande solar neutrino experiment with the data from the Homestake experiment leads to an upper bound on the neutrino magnetic moment in the range $\\mu_{\

Joao Pulido; Ana M. Mourao

1998-03-02

379

Family Theory and Family Health Research  

PubMed Central

Different family theories can be applied to different aspects of how families experience health and illness. The family health and illness cycle describes the phases of a family's experience, beginning with health promotion and risk reduction, then family vulnerability and disease onset or relapse, family illness appraisal, family acute response, and finally family adaptation to illness and recovery. For each phase, specific family theories that are most appropriate for guiding family and health research are discussed. PMID:21229056

Doherty, William J.

1991-01-01

380

An angle to tackle the neutrinos  

E-print Network

A brief history of the discovery of neutrino oscillations and neutrino mass is presented highlighting the recent breakthrough in the determination of a crucial neutrino parameter by the Daya Bay and RENO reactor experiments. The importance of this parameter in the context of one of the goals of the India-based Neutrino Observatory (INO) project and also in advancing the frontier of neutrino physics is explained.

G. Rajasekaran

2012-06-01

381

What we can learn from atmospheric neutrinos  

E-print Network

Physics potential of future measurements of atmospheric neutrinos is explored. Observation of $\\Delta m^2_{21}$ driven sub-dominant effects and $\\theta_{13}$ driven large matter effects in atmospheric neutrinos can be used to study the deviation of $\\theta_{23}$ from maximality and its octant. Neutrino mass hierarchy can be determined extremely well due to the large matter effects. New physics can be constrained both in standard atmospheric neutrino experiments as well as in future neutrino telescopes.

Sandhya Choubey

2006-09-19

382

Theory Predictions for Inclusive atmospheric Neutrino flux  

NASA Astrophysics Data System (ADS)

We describe the history of theory prediction of inclusive atmospheric neutrino flux shortly, then the 3-dimensional calculation of atmospheric neutrino flux in some detail. With the calculated atmospheric neutrino flux for INO and South Pole, we discuss on the relation of atmospheric neutrino flux and geomagnetic field. We find the full 3-dimensional scheme calculation is necessary for the theory prediction of the atmospheric neutrino flux.

Honda, Morihiro

2013-06-01

383

Neutrino-induced muons observed with MINOS  

SciTech Connect

The Main Injector Neutrino Oscillation Search (MINOS) experiment's Far Detector has been operational since July 2003, taking cosmic ray and atmospheric neutrino data from its location in the Soudan Mine Underground Lab. Numerous neutrino-induced muons have been observed. The detector's magnetic field allows the first determination by a large underground detector of muon charge and thus neutrino versus anti-neutrino on an event by event basis.

Habig, A.; /Minnesota U., Duluth

2005-07-01

384

Superluminal Neutrinos without Revolution  

E-print Network

The velocity anomaly recently reported by the OPERA collaboration appears strikingly at odds with the theory of special relativity. I offer a reinterpretation which removes this conflict, to wit that neutrinos yield a truer measurement of Einstein's limiting speed, and that light and indeed all other matter are retarded by additional interactions with the dark universe. I discuss existing experimental constraints and show that such a notion, considered cosmologically, can be subsumed in the dark-energy equation of state in an expanding Friedman-Robertson-Walker (FRW) universe. Planned measurements of the temporal variation in redshift have the potential to distinguish the possibilities.

Susan Gardner

2011-12-06

385

Geometry of Majorana neutrino and new symmetries  

E-print Network

Experimental observation of Majorana fermion matter gives a new impetus to the understanding of the Lorentz symmetry and its extension, the geometrical properties of the ambient space-time structure, matter--antimatter symmetry and some new ways to understand the baryo-genesis problem in cosmology. Based on the primordial Majorana fermion matter assumption, we discuss a possibility to solve the baryo-genesis problem through the the Majorana-Diraco genesis in which we have a chance to understand creation of Q(em) charge and its conservation in our D=1+3 Universe after the Big Bang. In the Majorana-Diraco genesis approach there appears a possibility to check the proton and electron non-stability on the very low energy scale. In particle physics and in our space-time geometry, the Majorana nature of the neutrino can be related to new types of symmetries which are lying beyond the binary Cartan-Killing-Lie algebras/superalgebras. This can just support a conjecture about the non-completeness of the SM in terms of binary Cartan--Killing--Lie symmetries/supersymmetries. As one of the very important applications of such new ternary symmetries could be related with explanation of the nature of the three families and three colour symmetry. The Majorana neutrino can directly indicate the existence of a new extra-dimensional geometry and thanks to new ternary space-time symmetries, could lead at high energies to the unextraordinary phenomenological consequences.

G. G. Volkov

2006-07-30

386

Family Policies and Academic Achievement by Young Children in Single-Parent Families: An International Comparison. Population Research Institute Working Paper.  

ERIC Educational Resources Information Center

This study investigates the differences in the degree of low academic achievement of third and fourth graders living with single-parent families from 11 industrialized countries. The United States ranks first among the countries compared in terms of the achievement gap for children in single- and two-parent families. After controlling for…

Pong, Suet-ling; Dronkers, Jaap; Hampden-Thompson, Gillian

387

Sterile neutrinos as dark matter  

SciTech Connect

The simplest model that can accommodate a viable nonbaryonic dark matter candidate is the standard electroweak theory with the addition of right-handed or sterile neutrinos. This model has been studied extensively in the context of the hot dark matter scenario. We reexamine this model and find that hot, warm, and cold dark matter are all possibilities. We focus on the case where sterile neutrinos are the dark matter. Since their only direct coupling is to left-handed or active neutrinos, the most efficient production mechanism is via neutrino oscillations. If the production rate is always less than the expansion rate, then these neutrinos will never be in thermal equilibrium. However, they may still play a significant role in the dynamics of the Universe and possibly provide the missing mass necessary for closure. We consider a single generation of neutrino fields ({nu}{sub L}, {nu}{sub R}) with a Dirac mass, {mu}, and a Majorana mass for the right-handed components only, M. For M {much_gt} {mu} we show that the number density of sterile neutrinos is proportional to {mu}{sup 2}/M so that the energy density today is independent of M. However M is crucial in determining the large scale structure of the Universe. In particular, M {approx_equal} 0.1--1.0 key leads to warm dark matter and a structure formation scenario that may have some advantages over both the standard hot and cold dark matter scenarios.

Dodelson, S. [Fermi National Accelerator Lab., Batavia, IL (United States); Widrow, L.M. [Queen`s Univ., Kingston, ON (Canada). Dept. of Physics]|[Toronto Univ., ON (Canada). Canadian Inst. for Theoretical Astrophysics

1993-03-01

388

Sterile neutrinos as dark matter  

SciTech Connect

The simplest model that can accommodate a viable nonbaryonic dark matter candidate is the standard electroweak theory with the addition of right-handed or sterile neutrinos. This model has been studied extensively in the context of the hot dark matter scenario. We reexamine this model and find that hot, warm, and cold dark matter are all possibilities. We focus on the case where sterile neutrinos are the dark matter. Since their only direct coupling is to left-handed or active neutrinos, the most efficient production mechanism is via neutrino oscillations. If the production rate is always less than the expansion rate, then these neutrinos will never be in thermal equilibrium. However, they may still play a significant role in the dynamics of the Universe and possibly provide the missing mass necessary for closure. We consider a single generation of neutrino fields ([nu][sub L], [nu][sub R]) with a Dirac mass, [mu], and a Majorana mass for the right-handed components only, M. For M [much gt] [mu] we show that the number density of sterile neutrinos is proportional to [mu][sup 2]/M so that the energy density today is independent of M. However M is crucial in determining the large scale structure of the Universe. In particular, M [approx equal] 0.1--1.0 key leads to warm dark matter and a structure formation scenario that may have some advantages over both the standard hot and cold dark matter scenarios.

Dodelson, S. (Fermi National Accelerator Lab., Batavia, IL (United States)); Widrow, L.M. (Queen's Univ., Kingston, ON (Canada). Dept. of Physics Toronto Univ., ON (Canada). Canadian Inst. for Theoretical Astrophysics)

1993-03-01

389

[Family ideology].  

PubMed

This paper treats the definition of the concept of family ideology linking it to that of social ideology. In both cases the ideology is seen as patterns of messages that obey certain semantic rules. Within the family context, it is considered that the conditions of production of the ideology are, concerning the profound structures, the unconscious oedipus conflict and kindred system that determines the family organization. Concerning the surface structures, the myths and beliefs that appear in each group as an answer to the need of accounting for the conflicts inherent to the family structure. The family ideology guides the subjects to places predetermined by the oedipus conflicts, "semanticizes" the conflicts and tends to dissimulate the conditions of production through the illusion that the subject is the producer. To analyze the family ideology, the following items must be taken into account: 1) Which are the semantic lines that are privileged in the couple and parent-children relationships. 2) The relations between the semantic lines established by the articulation rules prescribed by the cultural system. 3) The elementary forms of the ideological universe (the "actantial" model applied to family relationships). These three aspects articulate between themselves through transformation rules. PMID:7136827

Kornblit, A

1982-06-01

390

Fourth Five-Year Development Plan (1986/87-90/91 Fiscal Years).  

PubMed

Lesotho's fourth 5-year development plan contains specific provisions relating to family planning (FP) and maternal and child health (MCH). The plan recognizes the importance of good health to national development and details a family health program in 4 management components (MCH/FP, nutrition, care of the elderly, and care of the disabled), which also targets the needs of industrial workers. The MCH/FP program will seek to elevate the status of women and children in the family and in society. Its goals will be to ensure perinatal health, encourage deliveries by trained personnel, reduce infant and child mortality rates by 20%, control diarrheal disease, provide daily integrated services, achieve early detection and treatment of female reproductive carcinomas, and increase the level of acceptance of FP methods from 10 to 25%. These goals will be addressed by the following strategies: 1) the Family Health Division of the Ministry will be strengthened, 2) collaboration with all non-governmental organizations will be encouraged, 3) case management of diarrheal disease will include the proper use of oral rehydration, 4) services will include a more responsive information system. To implement these strategies the responsibilities of the organizational structure of the Family Health Division will be reviewed, management and technical staff will be trained, training manuals will be created, and adequate logistic support will be provided to ensure that equipment and supplies are always available. Finally, a mechanism for the consideration of family health concerns and for monitoring activities will be established to ensure that issues of primary concern are addressed. PMID:12344017

1989-01-01

391

MUON STORAGE RINGS - NEUTRINO FACTORIES  

SciTech Connect

The concept of a muon storage ring based Neutrino Source (Neutrino Factory) has sparked considerable interest in the High Energy Physics community. Besides providing a first phase of a muon collider facility, it would generate more intense and well collimated neutrino beams than currently available. The BNL-AGS or some other proton driver would provide an intense proton beam that hits a target, produces pions that decay into muons. The muons must be cooled, accelerated and injected into a storage ring with a long straight section where they decay. The decays occurring in the straight sections of the ring would generate neutrino beams that could be directed to detectors located thousands of kilometers away, allowing studies of neutrino oscillations with precisions not currently accessible. For example, with the neutrino source at BNL, detectors at Soudan, Minnesota (1,715 km), and Gran Sasso, Italy (6,527 km) become very interesting possibilities. The feasibility of constructing and operating such a muon-storage-ring based Neutrino-Factory, including geotechnical questions related to building non-planar storage rings (e.g. at 8{degree} angle for BNL-Soudan, and 3{degree} angle for BNL-Gran Sasso) along with the design of the muon capture, cooling, acceleration, and storage ring for such a facility is being explored by the growing Neutrino Factory and Muon Collider Collaboration (NFMCC). The authors present overview of Neutrino Factory concept based on a muon storage ring, its components, physics opportunities, possible upgrade to a full muon collider, latest simulations of front-end, and a new bowtie-muon storage ring design.

PARSA,Z.

2000-05-30

392

Neutrino masses, the $\\mu$-term and $\\mathcal{ PSL}_2(7)$  

E-print Network

Attention is drawn to a finely tuned Seesaw Majorana matrix linked to the charge $2/3$ quarks hierarchy. With a diagonal Dirac neutrino matrix, it gives tribimaximal mixing, and a normal hierarchy for the light neutrinos. We present a model with the family group $\\mathcal{PSL}_2(7)$ where this Majorana matrix is natural, and the top quark hierarchy, determined by the vacuum values of familon fields, is transferred to Higgs fields with family quantum numbers. $\\mathcal{ PSL}_2(7)$-invariant couplings then produce a $\\mu$-term at a scale commensurate with neutrino and quark masses, {\\em and} a hierarchy of thirteen orders of magnitude. This results in only one Higgs field (per hypercharge sector) with a $\\mu$-mass $\\sim 10-100$ GeV. With SUSY soft breaking, its vacuum value is automatically aligned to give masses to the top and bottom quarks.

Chen, Gaoli; Ramond, Pierre

2014-01-01

393

Random magnetic fields inducing solar neutrino spin-flavor precession in a three generation context  

E-print Network

We study the effect of random magnetic fields in the spin-flavor precession of solar neutrinos in a three generation context, when a non-vanishing transition magnetic moment is assumed. While this kind of precession is strongly constrained when the magnetic moment involves the first family, such constraints do not apply if we suppose a transition magnetic moment between the second and third families. In this scenario we can have a large non-electron anti-neutrino flux arriving on Earth, which can lead to some interesting phenomenological consequences, as, for instance, the suppression of day-night asymmetry. We have analyzed the high energy solar neutrino data and the KamLAND experiment to constrain the solar mixing angle, and solar mass difference, and we have found a larger shift of allowed values.

M. M. Guzzo; P. C. de Holanda; O. L. G. Peres

2005-04-20

394

Lepton Flavour Violation in the Presence of a Fourth Generation of Quarks and Leptons  

E-print Network

We calculate the rates for the charged lepton flavour violating (LFV) decays l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- -> e^-e^+e^-, the six three-body leptonic decays tau^- -> l_i^- l_j^+ l_k^- and the rate for mu-e conversion in nuclei in the Standard Model (SM3) extended by a fourth generation of quarks and leptons (SM4), assuming that neutrinos are Dirac particles. We also calculate branching ratios for K_L -> mu e, K_L -> pi^0 mu e, B_{d,s} -> mu e, B_{d,s} -> tau e and B_{d,s} -> tau mu. We find that the pattern of the LFV branching ratios in the SM4 differs significantly from the one encountered in the MSSM, allowing to distinguish these two models with the help of LFV processes in a transparent manner. Also differences with respect to the Littlest Higgs model with T-parity are found. Most importantly the branching ratios for l_i -> l_j gamma, tau -> l pi, tau -> l eta('), mu^- -> e^-e^+e^-, tau^- -> e^-e^+e^-, tau^- -> mu^- mu^+ mu^-, tau^- -> e^- mu^+ mu^- and tau^- -> mu^- e^+ e^- can all...

Buras, Andrzej J; Feldmann, Thorsten; Heidsieck, Tillmann; Promberger, Christoph

2010-01-01

395

Status of solar neutrino experiments  

SciTech Connect

A summary of the status of four solar neutrino experiments is presented. The Homestake {sup 37}Cl data are presented and the possible time dependence of the data is addressed. Data from 1040 days of operation of the Kamiokande II detector are presented next. The status of the {sup 71}Ga experiment in the Baksan Neutrino Observatory, which has operated for a short time, is discussed. The summary concludes with a discussion of the status of the Sudbury Neutrino Observatory, which has been under construction since the beginning of 1990. 7 refs., 6 figs.

Beier, E.W.; Davis, R. Jr.; Kim, S.B. (Pennsylvania Univ., Philadelphia, PA (USA). Dept. of Physics); Elliott, S.R. (Los Alamos National Lab., NM (USA)); Jelley, N. (Oxford Univ. (UK))

1990-01-01

396

Neutrino Leakage and Supernova Explosion  

NASA Astrophysics Data System (ADS)

In the process of supernova explosion, the neutrino leakage is very important. With different neutrino leakage schemes, the type II supernova explosions are simulated respectively for the stars with the mass of 12 M_{?}, 14 M_{?}, and 15 M_{?} by using a one-dimensional spherically symmetric model. The results show that the different neutrino leakage schemes have influence on the supernova collapse, shock wave propagation, and explosion. And the best values of corrective parameters which are propitious to the type II supernova explosions are given. In addition, the impacts of the equation of state and the compression modulus on the simulating results are discussed.

Liao, D. B.; Zhang, M. J.; Li, Y.; Pan, J. H.; Chen, X.

2014-09-01

397

Where do the Neutrinos go?  

NASA Astrophysics Data System (ADS)

Everybody knows that nuclear physics is the study the kind of matter found inside the atomic nucleus whether they it is at the center of atoms or the core of neutron stars. Nevertheless, nuclear physicists have made important discoveries about the neutrino. Figuring out where the neutrinos go in nuclear physics has challenged nuclear scientists, policy makers and those responsible for funding the enterprise. I will consider these and other challenges and how insightful scientific management has contributed the feast of wonderful discoveries about the neutrino.

Freedman, Stuart

2011-10-01

398

Neutrino interactions in neutron matter  

NASA Astrophysics Data System (ADS)

Neutrino flow is the dominant mechanism of energy transfer in the latest stages of supernovae explosions and in compact stars. The Standard Model of particle physics and accelerator data, provide a satisfactory description of neutrino physics in vacuum up to TeV scale. Nevertheless modeling the dynamics of neutrino interaction in the nuclear environment involves severe difficulties. This thesis in mainly aimed at obtaining the weak response of infinite matter, using both the Correlated Basis Function theory and Landau Theory of Fermi liquid to take into account properly nucleon-nucleon hard core potential and long range correlation (quasi-particle, collective modes, ecc.)

Cipollone, Andrea

2012-12-01

399

Supernova neutrino nucleosynthesis of light elements with neutrino oscillations.  

PubMed

Light element synthesis in supernovae through neutrino-nucleus interactions, i.e., the v process, is affected by neutrino oscillations in the supernova environment. There is a resonance of 13-mixing in the O/C layer, which increases the rates of charged-current -process reactions in the outer He-rich layer. The yields of 7Li and 11B increase by about a factor of 1.9 and 1.3, respectively, for a normal mass hierarchy and an adiabatic 13-mixing resonance, compared to those without neutrino oscillations. In the case of an inverted mass hierarchy and a nonadiabatic 13-mixing resonance, the increase in the 7Li and 11B yields is much smaller. Observations of the 7Li/11B ratio in stars showing signs of supernova enrichment could thus provide a unique test of neutrino oscillations and constrain their parameters and the mass hierarchy. PMID:16606251

Yoshida, Takashi; Kajino, Toshitaka; Yokomakura, Hidekazu; Kimura, Keiichi; Takamura, Akira; Hartmann, Dieter H

2006-03-10

400

Neutrino masses, leptogenesis, and sterile neutrino dark matter  

NASA Astrophysics Data System (ADS)

We analyze a scenario in which the lightest heavy neutrino N1 is a dark matter candidate and the second-heaviest neutrino N2 decays producing a lepton number. If N1 were in thermal equilibrium, its energy density today would be much larger than that of the observed dark matter, so we consider energy injection by the decay of N2. In this paper, we show the parameters of this scenario that give the correct abundances of dark matter and baryonic matter and also induce the observed neutrino masses. This model can explain a possible sterile neutrino dark matter signal of M1=7 keV in the x-ray observation of x-ray multi-mirror mission.

Tsuyuki, Takanao

2014-07-01

401

Unusual families.  

PubMed

The introduction of assisted reproduction has led to unusual forms of procreation. This article describes the social consequences of lesbian motherhood and of families headed by single heterosexual mothers. PMID:15819999

Golombok, Susan

2005-03-01

402

Family Money  

NSDL National Science Digital Library

Family Money is an investment center from Better Homes and Gardens Online. A wide variety of columns advise readers on home finance issues, and additional site tools include savings, loan, and car lease calculators for financial planning purposes.

403

Evidence for neutrino oscillations in the Sudbury Neutrino Observatory  

SciTech Connect

The Sudbury Neutrino Observatory (SNO) is a large-volume heavy water Cerenkov detector designed to resolve the solar neutrino problem. SNO observes charged-current interactions with electron neutrinos, neutral-current interactions with all active neutrinos, and elastic-scattering interactions primarily with electron neutrinos with some sensitivity to other flavors. This dissertation presents an analysis of the solar neutrino flux observed in SNO in the second phase of operation, while {approx}2 tonnes of salt (NaCl) were dissolved in the heavy water. The dataset here represents 391 live days of data. Only the events above a visible energy threshold of 5.5 MeV and inside a fiducial volume within 550 cm of the center of the detector are studied. The neutrino flux observed via the charged-current interaction is [1.71 {+-} 0.065(stat.){+-}{sub 0.068}{sup 0.065}(sys.){+-}0.02(theor.)] x 10{sup 6}cm{sup -2}s{sup -1}, via the elastic-scattering interaction is [2.21{+-}0.22(stat.){+-}{sub 0.12}{sup 0.11}(sys.){+-}0.01(theor.)] x 10{sup 6}cm{sup -2}s{sup -1}, and via the neutral-current interaction is [5.05{+-}0.23(stat.){+-}{sub 0.37}{sup 0.31}(sys.){+-}0.06(theor.)] x 10{sup 6}cm{sup -2}s{sup -1}. The electron-only flux seen via the charged-current interaction is more than 7{sigma} below the total active flux seen via the neutral-current interaction, providing strong evidence that neutrinos are undergoing flavor transformation as they travel from the core of the Sun to the Earth. The most likely origin of the flavor transformation is matter-induced flavor oscillation.

Marino, Alysia Diane

2004-08-10

404

An alternative for righthanded neutrinos: lefthanded see--saw  

E-print Network

A new lefthanded see-saw mechanism is constructed, implying both the smallness of active-neutrino masses and decoupling of heavy passive neutrinos, similarly to the situation in the case of conventional see-saw. But now, in place of the conventional righthanded neutrinos, the lefthanded sterile neutrinos play the role of heavy passive neutrinos, the righthanded neutrinos and righthanded sterile neutrinos being absent. In this case, the neutrino mass term is necessarily of pure Majorana type.

Wojciech Krolikowski

1999-09-10

405

Sterile Neutrinos and IceCube  

E-print Network

Although the framework for oscillations of the three neutrino flavors in the Standard Model has been convincingly established, indications persist that it may be incomplete. Challenges are coming from the LSND and MiniBooNe short-baseline experiments, from the neutrino sources used in the Gallex and Sage solar neutrino experiments and, more recently,from an a-posteriori analysis of reactor neutrino experiments. One way to accommodate the reported "anomalies", if real, is to introduce one or more sterile neutrinos in the mass range $\\delta m^2 \\sim 1 eV^2$. TeV atmospheric neutrinos propagating through the Earth undergo resonant oscillations in the presence of sterile neutrinos; a clear signature in a neutrino telescope like IceCube is the the change in shape of the zenith-energy distribution of the atmospheric neutrinos.

Francis Halzen

2011-11-03

406

Fact Families  

NSDL National Science Digital Library

In this lesson, the relationship of addition to subtraction is explored with books and with connecting cubes. Students search for related addition and subtraction facts for a given number using a virtual or actual calculator to find differences. They also investigate fact families when one addend is 0 as well as when the addends are the same. Students will: find missing addends, review the additive identity, generate fact families given two addends or given one addend and the sum.

Illuminations

2012-03-31

407

Jobcode Jobcode Descr Family Job Family Descr Ben Family  

E-print Network

Jobcode Jobcode Descr Job Family Job Family Descr Ben Family Sal Admin Plan Sal Grade Reg Temp FLSA Prof/Admin 93 33 HJC T N N No IPEDS-S Reporting 999 BWC N 010620 NUCLEAR MED TECH (TEMP) 33 Temporary T N N No IPEDS-S Reporting 000 BWC N #12;Jobcode Jobcode Descr Job Family Job Family Descr Ben Family

Awtar, Shorya

408

Radiative Emission of Neutrino Pairs in Atoms and Light Sterile Neutrinos  

E-print Network

The process of Radiative Emission of Neutrino Pair (RENP) in atoms is sensitive to the absolute neutrino mass scale, the type of spectrum neutrino masses obey and the nature - Dirac or Majorana - of massive neutrinos. We analyse the possibility to test the hypothesis of existence of neutrinos with masses at the eV scale coupled to the electron in the weak charged lepton current in an RENP experiment. The presence of eV scale neutrinos in the neutrino mixing is associated with the existence of sterile neutrinos which mix with the active flavour neutrinos. At present there are a number of hints for active-sterile neutrino oscillations driven by $\\Delta m^2 \\sim 1~{\\rm eV^2}$. We perform a detailed analysis of the RENP phenomenology within the "3 + 1" scheme with one sterile neutrino.

D. N. Dinh; S. T. Petcov

2014-11-27

409

First measurement of the flux of solar neutrinos from the sun at the Sudbury Neutrino Observatory  

NASA Astrophysics Data System (ADS)

The Sudbury Neutrino Observatory (SNO) is a second generation solar neutrino detector. SNO is the first experiment that is able to measure both the electron neutrino flux and a flavor-blind flux of all active neutrino types, allowing a model-independent determination if the deficit of solar neutrinos known as the solar neutrino problem is due to neutrino oscillation. The Sudbury Neutrino Observatory started taking production data in November, 1999. A measurement of the charged current rate will be the first indication if SNO too sees a suppression of the solar neutrino signal relative to the theoretical predictions. Such a confirmation is the first step in SNO's ambitious science program. In this thesis, we present evidence that SNO is seeing solar neutrinos and a preliminary ratio of the measured vs predicted rate of electrons as induced by 8B neutrinos in the ?e, + d --> p + p + e charged-current (CC) reaction.

Wittich, Peter

2000-12-01

410

Effects of Morphological Family Size for Young Readers  

ERIC Educational Resources Information Center

Dutch children, from the second and fourth grade of primary school, were each given a visual lexical decision test on 210 Dutch monomorphemic words. After removing words not recognized by a majority of the younger group, (lexical) decisions were analysed by mixed-model regression methods to see whether morphological Family Size influenced decision…

Perdijk, Kors; Schreuder, Robert; Baayen, R. Harald; Verhoeven, Ludo

2012-01-01

411

Competent Children at 10: Families, Early Education, and Schools.  

ERIC Educational Resources Information Center

This report is the fourth from the Competent Children project that is following a sample of children in the Wellington region of New Zealand from their early education experience into adulthood. The main aim of the project is to chart the contributions to children's progress made by family resources, early childhood education, school experiences,…

Wylie, Cathy; Thompson, Jean; Lythe, Cathy

412

Fourth order gravity: equations, history, and applications to cosmology  

E-print Network

The field equations following from a Lagrangian L(R) will be deduced and solved for special cases. If L is a non-linear function of the curvature scalar, then these equations are of fourth order in the metric. In the introduction we present the history of these equations beginning with the paper of H. Weyl from 1918, who first discussed them as alternative to Einstein's theory. In the third part, we give details about the cosmic no hair theorem, i.e., the details how within fourth order gravity with L= R + R^2 the inflationary phase of cosmic evolution turns out to be a transient attractor. Finally, the Bicknell theorem, i.e. the conformal relation from fourth order gravity to scalar-tensor theory, will be shortly presented.

H. -J. Schmidt

2006-02-05

413

Fourth ventricle rosette-forming glioneuronal tumor. Case report.  

PubMed

The authors describe a rosette-forming glioneuronal tumor of the fourth ventricle in a 29-year-old woman. She had been experiencing dizziness for 1 year and headaches for 1 month. Cranial computed tomography revealed a relatively circumscribed mass involving the inferior cerebellum and floor of the fourth ventricle with extension into the ventricle. Histologically, much of the tumor was piloid with Rosenthal fibers as well as telangiectatic blood vessels; other areas contained complete or incomplete neurocytic rosettes. This tumor type must be differentiated from pilocytic astrocytomas, other gliomas with a piloid glial component, and glioneuronal tumors arising from the floor of the fourth ventricle or inferior cerebellum. Recognition of, and long-term follow up for, this recently described pathological entity may clarify the nature of this lesion and strategies for its optimal management. PMID:16871887

Johnson, Mahlon; Pace, John; Burroughs, Judy F

2006-07-01

414

Rosette-forming glioneuronal tumor of the fourth ventricle.  

PubMed

Rosette-forming glioneuronal tumor (RGNT) of the fourth ventricle has been reported recently as a novel type of primary CNS neoplasm. We present the case of a 35-year-old male patient with RGNT of the fourth ventricle. The tumor was found incidentally; the patient did not suffer from any neurological symptoms. The tumor mass involved the caudal cerebellar vermis, filled the fourth ventricle and protruded into the caudal part of the mesencephalic aquaeduct. Smaller tumor nodules were visible in the adjacent right cerebellar hemisphere. Histologically, prominent neurocytic rosettes with synaptophysin expression were embedded in a glial tumor component resembling pilocytic astrocytoma. Clinicopathological features of our case closely resemble those reported in the original description. Thus, our case confirms RGNT as a new distinct type of primary CNS neoplasm. Due to its distinct features, adoption of RGNT as a new entity into the WHO classification of tumors should be considered. PMID:12915951

Preusser, Matthias; Dietrich, Wolfgang; Czech, Thomas; Prayer, Daniela; Budka, Herbert; Hainfellner, Johannes A

2003-11-01

415

Search for Possible Neutrino Decay During the 1999 Solar Eclipse  

Microsoft Academic Search

The solar neutrino problem could arise from the oscillation of one neutrino type into a second type. Neutrinos would have a mass and there could be the possibility of radiative neutrino decays. We discuss the search for neutrino decays during the 1999 total solar eclipse: it involves the emitted visible photons, while neutrinos travel from the Moon to the Earth.

S. Cecchini; G. Giacomelli; D. Hasegan; G. Mandrioli; O. Maris; L. Patrizii; V. Popa; L. Stefanov

1999-01-01

416

Primordial nucleosynthesis and neutrino physics.  

E-print Network

??We study primordial nucleosynthesis abundance yields for assumed ranges of cosmological lepton numbers, sterile neutrino mass-squared differences and active-sterile vacuum mixing angles. We fix the… (more)

Smith, Christel Johanna

2009-01-01

417

The Evolution of Neutrino Astronomy  

E-print Network

How did neutrino astronomy evolve? Are there any useful lessons for astronomers and physicists embarking on new observational ventures today? We answer the first question; the reader can can decide if there are any useful parallels for other fields.

John Bahcall; Raymond Davis, Jr

2000-04-08

418

Neutrinos and Nucleosynthesis in Supernova  

E-print Network

The type II supernova is considered as a candidate site for the production of heavy elements. The nucleosynthesis occurs in an intense neutrino flux, we calculate the electron fraction in this environment.

U. Solis; J. C. D'Olivo; L. G. Cabral-Rosetti

2005-11-12

419

High-Energy Neutrino Astronomy  

E-print Network

Kilometer-scale neutrino detectors such as IceCube are discovery instruments covering nuclear and particle physics, cosmology and astronomy. Examples of their multidisciplinary missions include the search for the particle nature of dark matter and for additional small dimensions of space. In the end, their conceptual design is very much anchored to the observational fact that Nature accelerates protons and photons to energies in excess of 10^{20} and 10^{13} eV, respectively. The cosmic ray connection sets the scale of cosmic neutrino fluxes. In this context, we discuss the first results of the completed AMANDA detector and the reach of its extension, IceCube. Similar experiments are under construction in the Mediterranean. Neutrino astronomy is also expanding in new directions with efforts to detect air showers, acoustic and radio signals initiated by neutrinos with energies similar to those of the highest energy cosmic rays.

F. Halzen

2005-01-26

420

Standard and non-standard primordial neutrinos  

E-print Network

The standard cosmological model predicts the existence of a cosmic neutrino background with a present density of about 110 cm^{-3} per flavour, which affects big-bang nucleosynthesis, cosmic microwave background anisotropies, and the evolution of large scale structures. We report on a precision calculation of the cosmic neutrino background properties including the modification introduced by neutrino oscillations. The role of a possible neutrino-antineutrino asymmetry and the impact of non-standard neutrino-electron interactions on the relic neutrinos are also briefly discussed.

P. D. Serpico

2006-06-02

421

Probing New Physics with Astrophysical Neutrinos  

E-print Network

We review the prospects for probing new physics with neutrino astrophysics. High energy neutrinos provide an important means of accessing physics beyond the electroweak scale. Neutrinos have a number of advantages over conventional astronomy and, in particular, carry information encoded in their flavor degree of freedom which could reveal a variety of exotic neutrino properties. We also outline ways in which neutrino astrophysics can be used to constrain dark matter properties, and explain how neutrino-based limits lead to a strong general bound on the dark matter total annihilation cross-section.

Nicole F. Bell

2008-11-06

422

Status of non-standard neutrino interactions.  

PubMed

The phenomenon of neutrino oscillations has been established as the leading mechanism behind neutrino flavor transitions, providing solid experimental evidence that neutrinos are massive and lepton flavors are mixed. Here we review sub-leading effects in neutrino flavor transitions known as non-standard neutrino interactions (NSIs), which is currently the most explored description for effects beyond the standard paradigm of neutrino oscillations. In particular, we report on the phenomenology of NSIs and their experimental and phenomenological bounds as well as an outlook for future sensitivity and discovery reach. PMID:23481442

Ohlsson, Tommy

2013-04-01

423

Neutrinos, a window on new physics  

E-print Network

This paper reviews some aspects of the physics of neutrinos, in particular neutrino masses and the issue of Dirac versus Majorana neutrinos. The see-saw mechanism is described and it is argued that the Majorana nature of neutrinos can be tested by measuring the invisible decays of the Higgs particle, as its decay into neutrinos is determined by their Yukawa couplings, i.e. the Dirac masses, rather than the physical Majorana masses. The measurement would allow us to probe the scale M of the large Majorana masses for right-handed singlet neutrinos. The optimal machine for performing such a measurement would be a future electron-positron collider.

van Holten, J W

2014-01-01

424

Plasma wave instabilities induced by neutrinos  

E-print Network

Quantum field theory is applied to study the interaction of an electron plasma with an intense neutrino flux. A connection is established between the field theory results and classical kinetic theory. The dispersion relation and damping rate of the plasma longitudinal waves are derived in the presence of neutrinos. It is shown that Supernova neutrinos are never collimated enough to cause non-linear effects associated with a neutrino resonance. They only induce neutrino Landau damping, linearly proportional to the neutrino flux and $G_{\\mathrm{F}}^{2}$.

Luis Bento

1999-12-29

425

Neutrino Oscillations: a source of Goldstone fields  

E-print Network

It is proved that true Goldstone bosons develop coherent fields whenever the associated charges of the matter particles are not conserved in a macroscopic scale. The sources of the Goldstone fields are the time rates of quantum number violation. The case of neutrino flavour oscillations is studied with application to Supernovae. It is shown that if the Lepton numbers break at the Fermi scale, the neutrino potentials and oscillation patterns change in the periods of largest neutrino fluxes. In this way, electron anti-neutrino to muon anti-neutrino oscillations may occur in the first instants of neutrino emission.

Luis Bento

1997-11-30

426

Neutrinos, a window on new physics  

E-print Network

This paper reviews some aspects of the physics of neutrinos, in particular neutrino masses and the issue of Dirac versus Majorana neutrinos. The see-saw mechanism is described and it is argued that the Majorana nature of neutrinos can be tested by measuring the invisible decays of the Higgs particle, as its decay into neutrinos is determined by their Yukawa couplings, i.e. the Dirac masses, rather than the physical Majorana masses. The measurement would allow us to probe the scale M of the large Majorana masses for right-handed singlet neutrinos. The optimal machine for performing such a measurement would be a future electron-positron collider.

J. W. van Holten

2014-12-13

427

Neutrino scattering and flavor transformation in supernovae.  

PubMed

We argue that the small fraction of neutrinos that undergo direction-changing scattering outside of the neutrinosphere could have significant influence on neutrino flavor transformation in core-collapse supernova environments. We show that the standard treatment for collective neutrino flavor transformation is adequate at late times but could be inadequate in early epochs of core-collapse supernovae, where the potentials that govern neutrino flavor evolution are affected by the scattered neutrinos. Taking account of this effect, and the way it couples to entropy and composition, will require a new approach in neutrino flavor transformation modeling. PMID:23004955

Cherry, John F; Carlson, J; Friedland, Alexander; Fuller, George M; Vlasenko, Alexey

2012-06-29

428

Active reduction of fluctuations in fourth-order modulation instability.  

PubMed

We experimentally study the fluctuation properties of a scalar fourth-order modulation instability (MI) process obtained by pumping a photonic crystal fiber in the normal dispersion region. We observe large wavelength-dependent pulse-to-pulse fluctuations that cannot be significantly reduced by stimulating the process with a single seed. Their reduction requires two seeds slightly detuned from the maximum gain frequency in order to also stimulate the second-order MI process cascaded from the fourth-order one. This concept is validated by experiments and numerical simulations. PMID:23073445

Hammani, K; Finot, C; Habert, R; Mussot, A; Kudlinski, A

2012-10-15

429

40 years of neutrino physics  

NASA Astrophysics Data System (ADS)

Wolfgang Pauli and Enrico Fermi pioneered the hypothesis and characteristics of the weak interaction and the elementary particle called the neutrino. Since its discovery some forty years ago the neutrino has been shown to be a fundamental constituent of matter with a surprisingly rich, and in very many ways unexpected, set of characteristics ranging from basic roles in the generation of energy in the sun to supernovæ.

Reines, Frederick

430

Extraterrestrial high energy neutrino fluxes  

NASA Technical Reports Server (NTRS)

Using the most recent cosmic ray spectra up to 2x10 to the 20th power eV, production spectra of high energy neutrinos from cosmic ray interactions with interstellar gas and extragalactic interactions of ultrahigh energy cosmic rays with 3K universal background photons are presented and discussed. Estimates of the fluxes from cosmic diffuse sources and the nearby quasar 3C273 are made using the generic relationship between secondary neutrinos and gammas and using recent gamma ray satellite data. These gamma ray data provide important upper limits on cosmological neutrinos. Quantitative estimates of the observability of high energy neutrinos from the inner galaxy and 3C273 above atmospheric background for a DUMAND type detector are discussed in the context of the Weinberg-Salam model with sq sin theta omega = 0.2 and including the atmospheric background from the decay of charmed mesons. Constraints on cosmological high energy neutrino production models are also discussed. It appears that important high energy neutrino astronomy may be possible with DUMAND, but very long observing times are required.

Stecker, F. W.

1979-01-01

431

The Family Support System: Education in Its Broadest Context. Harvesting the Harvesters. Book 4.  

ERIC Educational Resources Information Center

This fourth in a series of 10 study units for a Migrant Educators' National Training OutReach (MENTOR) correspondence course discusses the importance of family in the educational success of migrant children and emphasizes the need to maximize every useful form of family involvement. Designed for use in preservice or inservice teacher education,…

Lawless, Ken

432

Perceptions of School and Family Climates and Experiences of Relational Aggression  

ERIC Educational Resources Information Center

The role of family and school-level variables on relational aggression and relational victimization was investigated among 158 fourth- and fifth-grade children. Family cohesion, maternal and paternal responsiveness, and school climate were hypothesized to be significant predictors of relational aggression and relational victimization. The results…

Pernice-Duca, Francesca; Taiariol, Jennifer; Yoon, Jina

2010-01-01

433

Strongly interacting astrophysical neutrinos  

NASA Astrophysics Data System (ADS)

The origin and chemical composition of ultrahigh energy cosmic rays is still an open question in astroparticle physics. The observed large-scale isotropy and also direct composition measurements can be interpreted as an extragalactic proton dominance above the ankle at about 1010 GeV. Photopion production of extragalactic protons in the cosmic microwave background predicts a cut-off at about 5×1010 GeV in conflict with excesses reported by some experiments. In this report we will outline a recent statistical analysis [M. Ahlers, A. Ringwald, H. Tu, Astropart. Phys. (in press). Preprint astro-ph/0506698] of cosmic ray data using strongly interacting neutrinos as primaries for these excesses.

Ahlers, Markus

2006-07-01

434

Dark matter and the solar neutrino problem: Can particle physics provide a single solution  

SciTech Connect

We show how a relatively simple extension of the standard model can give a natural'' explanation for both the solar neutrino and dark matter problems. What is required is a new stable neutral lepton with a mass in the 4--8 GeV range. One possibility is a fourth generation neutrino interacting with matter either electromagnetically or via higgs-exchange (in addition, of course, to Z{degree}-exchange). In the former case, a new charged lepton with mass {approximately}10GeV would be required in order to generate a sufficiently large magnetic moment. The present experimental situation makes this possibility rather doubtful. In the latter case, a light higgs with mass {approximately}1GeV is required; this is still not ruled out experimentally. In any case, direct (or indirect) detection of dark matter will, during the next year, seal the fate of this model. 29 refs.

West, G.B. (Los Alamos National Lab., NM (USA))

1989-01-01

435

Neutrino factories: realization and physics potential  

SciTech Connect

Neutrino Factories offer an exciting option for the long-term neutrino physics program. This new type of neutrino facility will provide beams with unique properties. Low systematic uncertainties at a Neutrino Factory, together with a unique and precisely known neutrino flavor content, will enable neutrino oscillation measurements to be made with unprecedented sensitivity and precision. Over recent years, the resulting neutrino factory physics potential has been discussed extensively in the literature. In addition, over the last six years the R&D necessary to realize a Neutrino Factory has been progressing, and has developed into a significant international activity. It is expected that, within about five more years, the initial phase of this R&D program will be complete and, if the community chooses to build this new type of neutrino source within the following decade, neutrino factory technology will be ready for the final R&D phase prior to construction. In this paper (1) an overview is given of the technical ingredients needed for a Neutrino Factory, (2) beam properties are described, (3) the resulting neutrino oscillation physics potential is summarized, (4) a more detailed description is given for one representative Neutrino Factory design, and (5) the ongoing R&D program is summarized, and future plans briefly described.

Geer, S.; /Fermilab; Zisman, M.S.; /LBL, Berkeley

2006-12-01

436

Atmospheric Neutrinos in the MINOS Far Detector  

SciTech Connect

The phenomenon of flavour oscillations of neutrinos created in the atmosphere was first reported by the Super-Kamiokande collaboration in 1998 and since then has been confirmed by Soudan 2 and MACRO. The MINOS Far Detector is the first magnetized neutrino detector able to study atmospheric neutrino oscillations. Although it was designed to detect neutrinos from the NuMI beam, it provides a unique opportunity to measure the oscillation parameters for neutrinos and anti-neutrinos independently. The MINOS Far Detector was completed in August 2003 and since then has collected 2.52 kton-years of atmospheric data. Atmospheric neutrino interactions contained within the volume of the detector are separated from the dominant background from cosmic ray muons. Thirty seven events are selected with an estimated background contamination of less than 10%. Using the detector's magnetic field, 17 neutrino events and 6 anti-neutrino events are identified, 14 events have ambiguous charge. The neutrino oscillation parameters for {nu}{sub {mu}} and {bar {nu}}{sub {mu}} are studied using a maximum likelihood analysis. The measurement does not place constraining limits on the neutrino oscillation parameters due to the limited statistics of the data set analysed. However, this thesis represents the first observation of charge separated atmospheric neutrino interactions. It also details the techniques developed to perform atmospheric neutrino analyses in the MINOS Far Detector.

Howcroft, Caius L.F.; /Cambridge U.

2004-12-01

437

FIRST NEUTRINO POINT-SOURCE RESULTS FROM THE 22 STRING ICECUBE DETECTOR  

SciTech Connect

We present new results of searches for neutrino point sources in the northern sky, using data recorded in 2007-2008 with 22 strings of the IceCube detector (approximately one-fourth of the planned total) and 275.7 days of live time. The final sample of 5114 neutrino candidate events agrees well with the expected background of atmospheric muon neutrinos and a small component of atmospheric muons. No evidence of a point source is found, with the most significant excess of events in the sky at 2.2{sigma} after accounting for all trials. The average upper limit over the northern sky for point sources of muon-neutrinos with E {sup -2} spectrum is E{sup 2} {phi}{sub {nu}{sub {mu}}}< 1.4 x 10{sup -11} TeV cm{sup -2} s{sup -1}, in the energy range from 3 TeV to 3 PeV, improving the previous best average upper limit by the AMANDA-II detector by a factor of 2.

Abbasi, R.; Aguilar, J.; Andeen, K.; Baker, M. [Department of Physics, University of Wisconsin, Madison, WI 53706 (United States); Abdou, Y. [Department of Subatomic and Radiation Physics, University of Gent, B-9000 Gent (Belgium); Ackermann, M.; Bazo Alba, J. L.; Benabderrahmane, M. L.; Berdermann, J. [DESY, D-15735 Zeuthen (Germany); Adams, J. [Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch (New Zealand); Ahlers, M. [Department of Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP (United Kingdom); Auffenberg, J.; Becker, K.-H. [Department of Physics, University of Wuppertal, D-42119 Wuppertal (Germany); Bai, X. [Bartol Research Institute and Department of Physics and Astronomy, University of Delaware, Newark, DE 19716 (United States); Barwick, S. W. [Department of Physics and Astronomy, University of California, Irvine, CA 92697 (United States); Bay, R. [Department of Physics, University of California, Berkeley, CA 94720 (United States); Beattie, K. [Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Beatty, J. J. [Department of Physics and Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, OH 43210 (United States); Bechet, S. [Universite Libre de Bruxelles, Science Faculty CP230, B-1050 Brussels (Belgium); Becker, J. K. [Department of Physics, TU Dortmund University, D-44221 Dortmund (Germany)], E-mail: cfinley@icecube.wisc.edu, E-mail: jdumm@icecube.wisc.edu (and others)

2009-08-10

438

FIRST NEUTRINO POINT-SOURCE RESULTS FROM THE 22-STRING ICECUBE DETECTOR  

SciTech Connect

We present new results of searches for neutrino point sources in the northern sky, using data recorded in 2007-08 with 22 strings of the IceCube detector (approximately one-fourth of the planned total) and 275.7 days of livetime. The final sample of 5114 neutrino candidate events agrees well with the expected background of atmospheric muon neutrinos and a small component of atmospheric muons. No evidence of a point source is found, with the most significant excess of events in the sky at 2.2 {sigma} after accounting for all trials. The average upper limit over the northern sky for point sources of muon-neutrinos with E{sup -2} spectrum is E{sup 2} {Phi}{sub {nu}{sub {mu}}} < 1.4 x 10{sup -1} TeV cm{sup -2}s{sup -1}, in the energy range from 3 TeV to 3 PeV, improving the previous best average upper limit by the AMANDA-II detector by a factor of two.

IceCube Collaboration; Klein, Spencer

2009-05-14

439

First Neutrino Point-Source Results from the 22 String Icecube Detector  

NASA Astrophysics Data System (ADS)

We present new results of searches for neutrino point sources in the northern sky, using data recorded in 2007-2008 with 22 strings of the IceCube detector (approximately one-fourth of the planned total) and 275.7 days of live time. The final sample of 5114 neutrino candidate events agrees well with the expected background of atmospheric muon neutrinos and a small component of atmospheric muons. No evidence of a point source is found, with the most significant excess of events in the sky at 2.2? after accounting for all trials. The average upper limit over the northern sky for point sources of muon-neutrinos with E -2 spectrum is E^{2} ?_{?_{?}} < 1.4 × 10^{-11} TeV cm^{-2} s^{-1}, in the energy range from 3 TeV to 3 PeV, improving the previous best average upper limit by the AMANDA-II detector by a factor of 2.

Abbasi, R.; Abdou, Y.; Ackermann, M.; Adams, J.; Aguilar, J.; Ahlers, M.; Andeen, K.; Auffenberg, J.; Bai, X.; Baker, M.; Barwick, S. W.; Bay, R.; Bazo Alba, J. L.; Beattie, K.; Beatty, J. J.; Bechet, S.; Becker, J. K.; Becker, K.-H.; Benabderrahmane, M. L.; Berdermann, J.; Berghaus, P.; Berley, D.; Bernardini, E.; Bertrand, D.; Besson, D. Z.; Bissok, M.; Blaufuss, E.; Boersma, D. J.; Bohm, C.; Bolmont, J.; Böser, S.; Botner, O.; Bradley, L.; Braun, J.; Breder, D.; Castermans, T.; Chirkin, D.; Christy, B.; Clem, J.; Cohen, S.; Cowen, D. F.; D'Agostino, M. V.; Danninger, M.; Day, C. T.; De Clercq, C.; Demirörs, L.; Depaepe, O.; Descamps, F.; Desiati, P.; de Vries-Uiterweerd, G.; De Young, T.; Diaz-Velez, J. C.; Dreyer, J.; Dumm, J. P.; Duvoort, M. R.; Edwards, W. R.; Ehrlich, R.; Eisch, J.; Ellsworth, R. W.; Engdegård, O.; Euler, S.; Evenson, P. A.; Fadiran, O.; Fazely, A. R.; Feusels, T.; Filimonov, K.; Finley, C.; Foerster, M. M.; Fox, B. D.; Franckowiak, A.; Franke, R.; Gaisser, T. K.; Gallagher, J.; Ganugapati, R.; Gerhardt, L.; Gladstone, L.; Goldschmidt, A.; Goodman, J. A.; Gozzini, R.; Grant, D.; Griesel, T.; Groß, A.; Grullon, S.; Gunasingha, R. M.; Gurtner, M.; Ha, C.; Hallgren, A.; Halzen, F.; Han, K.; Hanson, K.; Hasegawa, Y.; Heise, J.; Helbing, K.; Herquet, P.; Hickford, S.; Hill, G. C.; Hoffman, K. D.; Hoshina, K.; Hubert, D.; Huelsnitz, W.; Hülß, J.-P.; Hulth, P. O.; Hultqvist, K.; Hussain, S.; Imlay, R. L.; Inaba, M.; Ishihara, A.; Jacobsen, J.; Japaridze, G. S.; Johansson, H.; Joseph, J. M.; Kampert, K.-H.; Kappes, A.; Karg, T.; Karle, A.; Kelley, J. L.; Kenny, P.; Kiryluk, J.; Kislat, F.; Klein, S. R.; Klepser, S.; Knops, S.; Kohnen, G.; Kolanoski, H.; Köpke, L.; Kowalski, M.; Kowarik, T.; Krasberg, M.; Kuehn, K.; Kuwabara, T.; Labare, M.; Lafebre, S.; Laihem, K.; Landsman, H.; Lauer, R.; Leich, H.; Lennarz, D.; Lucke, A.; Lundberg, J.; Lünemann, J.; Madsen, J.; Majumdar, P.; Maruyama, R.; Mase, K.; Matis, H. S.; McParland, C. P.; Meagher, K.; Merck, M.; Mészáros, P.; Middell, E.; Milke, N.; Miyamoto, H.; Mohr, A.; Montaruli, T.; Morse, R.; Movit, S. M.; Münich, K.; Nahnhauer, R.; Nam, J. W.; Nießen, P.; Nygren, D. R.; Odrowski, S.; Olivas, A.; Olivo, M.; Ono, M.; Panknin, S.; Patton, S.; Pérez de los Heros, C.; Petrovic, J.; Piegsa, A.; Pieloth, D.; Pohl, A. C.; Porrata, R.; Potthoff, N.; Price, P. B.; Prikockis, M.; Przybylski, G. T.; Rawlins, K.; Redl, P.; Resconi, E.; Rhode, W.; Ribordy, M.; Rizzo, A.; Rodrigues, J. P.; Roth, P.; Rothmaier, F.; Rott, C.; Roucelle, C.; Rutledge, D.; Ryckbosch, D.; Sander, H.-G.; Sarkar, S.; Satalecka, K.; Schlenstedt, S.; Schmidt, T.; Schneider, D.; Schukraft, A.; Schulz, O.; Schunck, M.; Seckel, D.; Semburg, B.; Seo, S. H.; Sestayo, Y.; Seunarine, S.; Silvestri, A.; Slipak, A.; Spiczak, G. M.; Spiering, C.; Stamatikos, M.; Stanev, T.; Stephens, G.; Stezelberger, T.; Stokstad, R. G.; Stoufer, M. C.; Stoyanov, S.; Strahler, E. A.; Straszheim, T.; Sulanke, K.-H.; Sullivan, G. W.; Swillens, Q.; Taboada, I.; Tarasova, O.; Tepe, A.; Ter-Antonyan, S.; Terranova, C.; Tilav, S.; Tluczykont, M.; Toale, P. A.; Tosi, D.; Tur?an, D.; van Eijndhoven, N.; Vandenbroucke, J.; Van Overloop, A.; Voigt, B.; Walck, C.; Waldenmaier, T.; Walter, M.; Wendt, C.; Westerhoff, S.; Whitehorn, N.; Wiebusch, C. H.; Wiedemann, A.; Wikström, G.; Williams, D. R.; Wischnewski, R.; Wissing, H.; Woschnagg, K.; Xu, X. W.; Yodh, G.; Ice Cube Collaboration

2009-08-01

440

Neutrino Physics Neutrinos rarely interact despite their vast abundance in nature. To give a sense of  

E-print Network

Chapter 1 Neutrino Physics Neutrinos rarely interact despite their vast abundance in nature. To give a sense of scale, a person has roughly 1016 neutrinos passing through them each second, completely unnoticed. Nonetheless, neutrinos can still be used to probe the fundamental laws of na- ture

441

Neutrinos and Arms Control: Thinking Big about Detection of Neutrinos from  

E-print Network

Neutrinos and Arms Control: Thinking Big about Detection of Neutrinos from Reactors at Long for a world network of enormous neutrino detec- tors, which may be employed for monitoring the activity of allV, placed in the deep oceans (or possibly lakes) can record the electron anti-neutrino uxes from reactors

Learned, John

442

Reactor Monitoring Reactor Monitoring (near and far) with Neutrinos(near and far) with Neutrinos  

E-print Network

1 Reactor Monitoring Reactor Monitoring (near and far) with Neutrinos(near and far) with Neutrinos Neutrino Applications are on the horizon John G. LearnedJohn G. Learned Physics and Astronomy, University and astrophysics, initiator and participant in many neutrino experiments (IMB, DUMAND, SuperK, KamLAND, K2K

Learned, John

443

Neutrinos and Arms Control: Thinking Big about Detection of Neutrinos from  

E-print Network

Neutrinos and Arms Control: Thinking Big about Detection of Neutrinos from Reactors at Long for a world network of enormous neutrino detec­ tors, which may be employed for monitoring the activity of allV, placed in the deep oceans (or possibly lakes) can record the electron anti­neutrino fluxes from reactors

Learned, John

444

Can neutrino-electron scattering tell us whether neutrinos are Dirac or Majorana particles  

SciTech Connect

There has recently been interest in the possibility that neutrino-electron scattering experiments could determine whether neutrinos are Dirac or Majorana particles by providing information on their electromagnetic structure. We try to explain why studies of neutrino electromagnetic structure actually cannot distinguish between Dirac and Majorana neutrinos. 9 refs.

Kayser, B.

1988-04-01

445

The solar neutrino problem in the presence of flavor-changing neutrino interactions  

NASA Astrophysics Data System (ADS)

We study the effects of flavor-changing neutrino interactions on the resonant conversion of solar neutrinos. In particular, we describe how the regions in the ?m2-sin 22? plane that are consistent with the four solar neutrino experiments are modified for different strengths of New Physics neutrino interactions.

Bergmann, Sven

1998-03-01

446

17 keV neutrino and large magnetic moment solution of the solar neutrino puzzle  

E-print Network

Zee-type models with Majorons naturally incorporate the 17 keV neutrino but in their minimal version fail to simultaneously solve the solar neutrino puzzle. If there is a sterile neutrino state, we find a particularly simple solution to the solar neutrino problem, which besides $\

Eugeni Akhmedov; Zurab Berezhiani; Goran Senjanovic; Zhijian Tao

1992-09-02

447

Solar neutrino oscillations and bounds on neutrino magnetic moment and solar magnetic field  

Microsoft Academic Search

If the observed deficit of solar neutrinos is due to neutrino oscillations, neutrino conversions caused by the interaction of their transition magnetic moments with the solar magnetic field (spin-flavour precession) can still be present at a subdominant level. In that case, the combined action of neutrino oscillations and spin-flavour precession can lead to a small but observable flux of electron

E. Kh. Akhmedov

2003-01-01

448

Solar neutrino oscillations and bounds on neutrino magnetic moment and solar magnetic field  

Microsoft Academic Search

If the observed deficit of solar neutrinos is due to neutrino oscillations, neutrino conversions caused by the interaction of their transition magnetic moments with the solar magnetic field (spin-flavour precession) can still be present at a subdominant level. In that case, the combined action of neutrino oscillations and spin-flavour pre- cession can lead to a small but observable flux of

E. Kh; Joao Pulido

449

A Search for Neutrinos from the Solar hep Reaction and the Diffuse Supernova Neutrino Background with the Sudbury Neutrino Observatory  

Microsoft Academic Search

A search has been made for neutrinos from the hep reaction in the Sun and from the diffuse supernova neutrino background (DSNB) using data collected during the first operational phase of the Sudbury Neutrino Observatory, with an exposure of 0.65 ktons yr. For the hep neutrino search, two events are observed in the effective electron energy range of 14.3 MeV

B. Aharmim; S. N. Ahmed; A. E. Anthony; E. W. Beier; A. Bellerive; M. Bergevin; S. D. Biller; M. G. Boulay; Y. D. Chan; M. Chen; X. Chen; B. T. Cleveland; G. A. Cox; C. A. Currat; X. Dai; F. Dalnoki-Veress; H. Deng; J. Detwiler; M. DiMarco; P. J. Doe; G. Doucas; P.-L. Drouin; F. A. Duncan; M. Dunford; J. A. Dunmore; E. D. Earle; H. C. Evans; G. T. Ewan; J. Farine; H. Fergani; F. Fleurot; R. J. Ford; J. A. Formaggio; N. Gagnon; J. Tm. Goon; K. Graham; E. Guillian; R. L. Hahn; A. L. Hallin; E. D. Hallman; P. J. Harvey; R. Hazama; K. M. Heeger; W. J. Heintzelman; J. Heise; R. L. Helmer; R. J. Hemingway; R. Henning; A. Hime; C. Howard; M. A. Howe; M. Huang; P. Jagam; N. A. Jelley; J. R. Klein; L. L. Kormos; M. Kos; A. Krüger; C. B. Krauss; T. Kutter; C. C. M. Kyba; H. Labranche; R. Lange; J. Law; I. T. Lawson; K. T. Lesko; J. R. Leslie; J. C. Loach; S. Luoma; R. MacLellan; S. Majerus; H. B. Mak; J. Maneira; A. D. Marino; R. Martin; N. McCauley; A. B. McDonald; S. McGee; C. Mifflin; K. K. S. Miknaitis; M. L. Miller; B. Monreal; B. G. Nickel; A. J. Noble; E. B. Norman; N. S. Oblath; C. E. Okada; H. M. O'Keeffe; G. D. Orebi Gann; S. M. Oser; R. Ott; S. J. M. Peeters; A. W. P. Poon; G. Prior; K. Rielage; B. C. Robertson; R. G. H. Robertson; E. Rollin; M. H. Schwendener; J. A. Secrest; S. R. Seibert; O. Simard; C. J. Sims; D. Sinclair; P. Skensved; R. G. Stokstad; L. C. Stonehill; G. Tesic; N. Tolich; T. Tsui; R. Van Berg; R. G. Van de Water; B. A. VanDevender; C. J. Virtue; T. J. Walker; B. L. Wall; D. Waller; H. Wan Chan Tseung; D. L. Wark; J. Wendland; J. F. Wilkerson; J. R. Wilson; J. M. Wouters; A. Wright; M. Yeh; F. Zhang; K. Zuber

2006-01-01

450

Long-range correlations of neutrinos in hadron reactions and neutrino diffraction II: neutrino  

E-print Network

In this II, a probability to detect the neutrino produced in a high-energy pion decay is shown to receive the large finite-size correction. The neutrino interacts extremely weakly with matters and is described with a many-body wave function together with the pion and charged lepton. This wave function slowly approaches to an asymptotic form, which is probed by the neutrino. The whole process is described by an S-matrix of a finite-time interval, which couples with states of non-conserving kinetic energy, and the final states of a broad spectrum specific to a relativistic invariant system contribute to the positive semi-definite correction similar to diffraction of waves through a hole. This diffraction component for the neutrino becomes long range and stable under changes of the pion's energy. Moreover, it has a universal form that depends on the absolute neutrino mass. Thus a new method of measuring the absolute neutrino mass is suggested.

Kenzo Ishikawa; Yutaka Tobita

2012-09-25

451

Supernova neutrino signals by liquid Argon detector and neutrino magnetic moment  

NASA Astrophysics Data System (ADS)

We study ? and ? signals from a supernova with strong magnetic field detected by a 100 kton liquid Ar detector. The change of neutrino flavors by resonant spin-flavor conversions, matter effects, and neutrino self-interactions are taken into account. Different neutrino signals, characterized by the total event numbers of ? and ? and neutronization burst event, are expected with different neutrino oscillation parameters and neutrino magnetic moment. Observations of supernova neutrino signals by a 100 kton liquid Ar detector would constrain oscillation parameters as well as neutrino magnetic moment in either normal and inverted mass hierarchies.

Yoshida, Takashi; Takamura, Akira; Kimura, Keiichi; Kawagoe, Shio; Kajino, Toshitaka; Yokomakura, Hidekazu

2011-10-01

452

One Right-handed Neutrino to Generate Complete Neutrino Mass Spectrum in the Framework of NMSSM  

E-print Network

The see-saw mechanism is usually applied to explain the lightness of neutrinos. The traditional see-saw mechanism introduces at least two right-handed neutrinos for the realistic neutrino spectrum. In the case of supersymmetry, loop corrections can also contribute to neutrino masses, which lead to the possibility to generate the neutrino spectrum by introducing just one right-handed neutrino. To be realistic, MSSM suffers from the mu problem and other phenomenological difficulties, so we extend NMSSM (the MSSM with a singlet S) by introducing one single right-handed neutrino superfield (N) and relevant phenomenology is discussed

Yi-Lei Tang

2014-11-07

453

One right-handed neutrino to generate complete neutrino mass spectrum in the framework of NMSSM  

NASA Astrophysics Data System (ADS)

The see-saw mechanism is usually applied to explain the lightness of neutrinos. The traditional see-saw mechanism introduces at least two right-handed neutrinos for the realistic neutrino spectrum. In the case of supersymmetry, loop corrections can also contribute to neutrino masses, which lead to the possibility to generate the neutrino spectrum by introducing just one right-handed neutrino. To be realistic, MSSM suffers from the ? problem and other phenomenological difficulties, so we extend NMSSM (the MSSM with a singlet S) by introducing one single right-handed neutrino superfield (N) and relevant phenomenology is discussed.

Tang, Yi-Lei

2015-01-01

454

Neutrino oscillations in the early universe with an inverted neutrino-mass hierarchy  

NASA Astrophysics Data System (ADS)

Nuclear simulations of neutrino oscillations in the early Universe are performed for a neutrino-mass hierarchy with the vacuum mass of the second neutrino exceeding that of the first. This situation is equivalent to a normal hierarchy with mixing angle greater than ?/4. We find that a large conversion of electron neutrinos to muon neutrinos occurs, independent of mixing angle. For certain parameter values, this is caused by the MSW effect. In the rest of the parameter region a new mechanism is operative, arising from nonlinear effects involving neutrino-neutrino forward scattering. This nonlinear conversion mechanism causes substantial flavor oscillation even for extremely small mixing angles.

Kostelecký, V. Alan; Samuel, Stuart

1993-11-01

455

A new duality transformation for fourth-order gravity  

E-print Network

We prove that for non-linear L = L(R), the Lagrangians L and \\hat L give conformally equivalent fourth-order field equations being dual to each other. The proof represents a new application of the fact that the operator is conformally invariant.

Hans - Juergen Schmidt

1997-02-28

456

Gender Differences in Inference Generation by Fourth-Grade Students  

ERIC Educational Resources Information Center

The purpose of this study was to determine if there are gender differences among elementary school-aged students in regard to the inferences they generate during reading. Fourth-grade students (130 females; 126 males) completed think-aloud tasks while reading one practice and one experimental narrative text. Females generated a larger number and a…

Clinton, Virginia; Seipel, Ben; Broek, Paul; McMaster, Kristen L.; Kendeou, Panayiota; Carlson, Sarah E.; Rapp, David N.

2014-01-01

457

RACE EQUALITY SCHEME: Fourth Annual Progress Report (2010-2011)  

E-print Network

1 RACE EQUALITY SCHEME: Fourth Annual Progress Report (2010-2011) For copies of this report's continuing race equality work, and provides data on key aspects of the staff and student population of the University. Work on the Race Equality Scheme is overseen by the Race Equality Steering Group (RESG), chaired

Henderson, Gideon

458

A Semilinear Fourth Order Elliptic Problem with Exponential Nonlinearity  

Microsoft Academic Search

We study a semilinear fourth order elliptic problem with exponential nonlinearity. Motivated by a question raised in (Li), we partially extend known results for the corre- sponding second order problem. Several new diculties arise and many problems still remain to be solved. We list the ones we feel particularly interesting in the nal section. Mathematics Subject Classic ation: 35J65; 35J40.

Gianni Arioli; Filippo Gazzola; Christoph Grunau; Enzo Mitidieri

2005-01-01

459

Dental Hygiene Program Clinic Manual, Fall 1997. Fourth Edition.  

ERIC Educational Resources Information Center

This is the fourth edition of the Clinic Manual for the Dental Hygiene Program at Eugenio Maria de Hostos Community College in the Bronx (New York). It contains general information, grading procedures, performance guides, and clinical forms related to the program. Section 1 provides an introduction to clinic philosophy, policies, goals and…

Errico, Mary; Cama, Christine; Pastoriza-Maldonado, Alida

460

Fourth Graders' Motivation in an Elementary Physical Education Running Program  

ERIC Educational Resources Information Center

In this study we examined students' motivation in an elementary physical education running program using achievement goal theory and an expectancy-value model of achievement choice as theoretical frameworks. Fourth graders (N = 119) completed questionnaires assessing their achievement goals, expectancy-related beliefs, subjective task values, and…

Xiang, Ping; McBride, Ron E.; Bruene, April

2004-01-01

461

The Informed Argument: A Multidisciplinary Reader and Guide. Fourth Edition.  

ERIC Educational Resources Information Center

Reflecting the belief that learning is best fostered by encouraging students to read, reflect, and write about serious issues, this book is designed to help students argue on behalf of their beliefs so that other people will take them seriously. The 85 readings gathered in the book (60 of which are new to the fourth edition) give students adequate…

Miller, Robert K.

462

CMSC-37110 Discrete Mathematics FOURTH QUIZ December 1, 2010  

E-print Network

CMSC-37110 Discrete Mathematics FOURTH QUIZ December 1, 2010 Name (print): Do not use book, notes absolute value 1. 2. (5 points) Draw a strongly connected digraph with period 3 but with no cycle are positive. (Recall that a Markov Chain is irreducible if the corresponding digraph is strongly connected

Babai, László

463

Short-term energy outlook: Quarterly projections, fourth quarter 1997  

SciTech Connect

The Energy Information Administration (EIA) prepares quarterly short-term energy supply, demand, and price projections for printed publication in January, April, July, and October in the Short-Term Energy Outlook. The details of these projections, as well as monthly updates on or about the 6th of each interim month, are available on the internet at: www.eia.doe.gov/emeu/steo/pub/contents.html. The forecast period for this issue of the Outlook extends from the fourth quarter of 1997 through the fourth quarter of 1998. Values for the fourth quarter of 1997, however, are preliminary EIA estimates (for example, some monthly values for petroleum supply and disposition are derived in part from weekly data reported in EIA`s Weekly Petroleum Status Report) or are calculated from model simulations that use the latest exogenous information available (for example, electricity sales and generation are simulated by using actual weather data). The historical energy data, compiled in the fourth quarter 1997 version of the Short-Term Integrated Forecasting System (STIFS) database, are mostly EIA data regularly published in the Monthly Energy Review, Petroleum Supply Monthly, and other EIA publications. Minor discrepancies between the data in these publications and the historical data in this Outlook are due to independent rounding. The STIFS model is driven principally by three sets of assumptions or inputs: estimates of key macroeconomic variables, world oil price assumptions, and assumptions about the severity of weather. 19 tabs.

NONE

1997-10-14

464

6. FOURTH FLOOR, DETAIL OF HOTEL SOAP LINE TO NORTH: ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. FOURTH FLOOR, DETAIL OF HOTEL SOAP LINE TO NORTH: AMERICAN CAR & FOUNDRY COMPANY MANUAL SOAP CUTTER INSTALLED 1932 (FOREGROUND); CONVEYORS; AND R.A. JONES & COMPANY HORIZONTAL PRESS INSTALLED 1931 (BACKGROUND) - Colgate & Company Jersey City Plant, Building No. B-15, 90-96 Greene Street, Jersey City, Hudson County, NJ

465

Did that Dog Sniff Violate the Fourth Amendment?  

ERIC Educational Resources Information Center

Is sniffing at the front door of a private home by a trained narcotics detection dog a Fourth Amendment search requiring probable cause? Is a "drug dog" somehow like a manmade technology, such as a thermal imaging device? These were a couple of the questions recently presented to the U.S. Supreme Court during arguments in "Florida v. Jardines."…

Hawke, Catherine; Middleton, Tiffany

2012-01-01

466

Rentz's Student Affairs Practice in Higher Education. Fourth Edition  

ERIC Educational Resources Information Center

The mission of this new fourth edition is to provide the reader with a solid foundation in the historical and philosophical perspectives of college student affairs development; assist the reader in understanding the major concepts and purpose of student affairs' practice, methods, and program models; enable the reader to conceptualize the theme,…

Zhang, Naijian

2011-01-01

467

The Value of the Fourth Year of Mathematics. Math Works  

ERIC Educational Resources Information Center

Too many students and educators view the senior year and graduation from high school as an end point, rather than one vital step along the education pipeline. Students who engage in a fourth year of math tap into and build upon their advanced analytic skills and are more likely to have better success in postsecondary course work, as they have…

Achieve, Inc., 2013

2013-01-01

468

Effects of Mathematical Vocabulary Instruction on Fourth Grade Students.  

ERIC Educational Resources Information Center

This study compares the effects of two models of vocabulary instruction: (1) the integrated graphic organizer/discussion model; and (2) the definition-only model on the mathematical vocabulary use of fourth grade students. The integrated model combines a modified Concept of Definition (CD) graphic organizer with the Frayer discussion model. The…

Monroe, Eula Ewing; Pendergrass, Michelle R.

469

Proceedings of the Fourth International Wildlife Law Conference  

NSDL National Science Digital Library

The Wildlife Interest Group of the American Society of International Law has posted online the Proceedings of the Fourth International Wildlife Law Conference (.pdf format), held March 1999 in Washington, DC. The document highlights case studies on the implementation of the Convention on International Trade in Endangered Species (CITES) at the national and regional level.

International Wildlife Law Conference (4th : 1999 : Washington. D.C.).

470

Fourth Calcined Solids Storage Facility. Final safety analysis report  

Microsoft Academic Search

This safety analysis report describes the Fourth Calcined Solids Storage Facility and presents the results of a safety evaluation of the facility including a design basis accident. The Idaho Chemical Processing Plant (ICPP) is a multi-purpose facility for recovering enriched U-235 from a wide variety of spent reactor fuels. Solvent extraction processes employed in recovery of fissile materials generate radioactive

Schindler

1980-01-01

471

Fourth Grade: Late Fall and Early Spring Curriculum Guide.  

ERIC Educational Resources Information Center

Activity plans for fourth grade outdoor education experiences comprise the bulk of this curriculum guide. Many of the outlines have been developed through practical application and experimentation by staff members of the Outdoor and Environmental Education Center (OEEC) of the Harrisburg, Pennsylvania, City Schools. Activities and studies for the…

Jacobs, Joel Robert, Ed.

472

Educating Children with Multiple Disabilities: A Collaborative Approach. Fourth Edition  

ERIC Educational Resources Information Center

Now in its fourth edition, this highly respected, bestselling textbook gives undergraduate and graduate students up-to-the-minute research and strategies for educating children with severe and multiple disabilities. This popular core text--for 15 years, a staple of teacher training programs in special education and related fields--thoroughly…

Orelove, Fred P., Ed.; Sobsey, Dick, Ed.; Silberman, Rosanne K., Ed.

2004-01-01

473

Sights, Sounds, Senses in Step with Reading. Fourth Grade.  

ERIC Educational Resources Information Center

This ESEA Title III bibliography presents books, films, filmstrips, and records that correlate with stories from selected fourth-grade basic reading books. The list of books is prepared from the suggested lists of the Ginn, Houghton Mifflin, Lippincott, and Scott, Foresman reading series. The bibliography includes sections about animals and birds,…

Norris, Mildred W.; Messerli, John H.

474

VIEW OF THE EAST CHECKOUT CELL, FOURTH LEVEL OF THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF THE EAST CHECK-OUT CELL, FOURTH LEVEL OF THE EXTERNAL TANK CHECK-OUT CELLS, HB-2, FACING NORTHEAST - Cape Canaveral Air Force Station, Launch Complex 39, Vehicle Assembly Building, VAB Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

475

VIEW OF THE WEST CHECKOUT CELL, FOURTH LEVEL OF THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF THE WEST CHECK-OUT CELL, FOURTH LEVEL OF THE EXTERNAL TANK CHECK-OUT CELLS, HB-2, FACING SOUTHWEST - Cape Canaveral Air Force Station, Launch Complex 39, Vehicle Assembly Building, VAB Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

476

16. Parker Dam, only top fourth of dam visible, at ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

16. Parker Dam, only top fourth of dam visible, at 320' high, Parker Dam is one of the highest in the world. Much of this height is because dam penetrates well below river bottom to fasten to bedrock. - Parker Dam, Spanning Colorado River between AZ & CA, Parker, La Paz County, AZ

477

Fourth Way in Action: Teacher Education in Singapore  

ERIC Educational Resources Information Center

Policy makers are often looking for solutions to develop their educational systems in today's highly competitive knowledge-based economy. Hargreaves and Shirley's Fourth Way provides a useful approach in analysing policy trends, successes and pitfalls, based on an observation of practices and research evidences in the west, particularly, the USA…

Tan, Oon Seng

2012-01-01

478

13. Interior view on the fourth floor. A view looking ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. Interior view on the fourth floor. A view looking northwest showing a typical arrangement of lease space offices, with glass door, lavatory and clothes closets. - John T. Beasley Building, 632 Cherry Street (between Sixth & Seventh Streets), Terre Haute, Vigo County, IN

479

Dynamic Characters: A Year in the Life of Fourth Hour  

ERIC Educational Resources Information Center

In this article, the author relates how she was able to facilitate a turn around with a seemingly hopeless regular English class. Her fourth class, which consisted of the thugs and slugs, was her first regular class as she had always been assigned the honors classes. Many of these students were repeating the class, having failed the previous year.…

Meiklejohn, Julie

2006-01-01

480

Regularizing QCD with staggered fermions and the fourth root trick  

E-print Network

We investigate the properties of staggered-fermion lattice QCD in which the fourth root of the fermion determinant is taken. We show that this theory is non-local at non-zero lattice spacing $a$, and that the non-locality is caused by the breaking of taste symmetry at $a\

Claude Bernard; Maarten Golterman; Yigal Shamir

2006-09-29

481

18. FOURTH FLOOR BLDG. 28, RAISED CONCRETE SLAB FLOOR WITH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. FOURTH FLOOR BLDG. 28, RAISED CONCRETE SLAB FLOOR WITH BLOCKS AND PULLEYS OVERHEAD LOOKING NORTHEAST. - Fafnir Bearing Plant, Bounded on North side by Myrtle Street, on South side by Orange Street, on East side by Booth Street & on West side by Grove Street, New Britain, Hartford County, CT

482

19. FOURTH FLOOR BLDG. 28, DETAIL BLOCKS, PULLEYS, AND ELECTRIC ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

19. FOURTH FLOOR BLDG. 28, DETAIL BLOCKS, PULLEYS, AND ELECTRIC MOTOR LOOKING EAST. - Fafnir Bearing Plant, Bounded on North side by Myrtle Street, on South side by Orange Street, on East side by Booth Street & on West side by Grove Street, New Britain, Hartford County, CT

483

Fourth-order finite difference method for solving Burgers' equation  

Microsoft Academic Search

In this paper, we present fourth-order finite difference method for solving nonlinear one-dimensional Burgers’ equation. This method is unconditionally stable. The convergence analysis of the present method is studied and an upper bound for the error is derived. Numerical comparisons are made with most of the existing numerical methods for solving this equation.

I. A. Hassanien; A. A. Salama; H. A. Hosham

2005-01-01

484

Second-to-Fourth Digit Length, Testosterone and Spatial Ability  

ERIC Educational Resources Information Center

Based on stimulating findings suggesting that prenatal levels of steroids may influence cognitive functions, a study with N=40 healthy volunteers of both sexes was conducted. Prenatal levels of testosterone (T) were estimated by use of the second-to-fourth digit ratio (2D:4D) which is supposed to be controlled by the same genes involved in…

Kempel, P.; Gohlke, B.; Klempau, J.; Zinsberger, P.; Reuter, M.; Hennig, J.

2005-01-01

485

An unorthodox alternative for righthanded neutrinos: lefthanded see-saw  

E-print Network

A new lefthanded see-saw mechanism is constructed, implying both the smallness of active-neutrino masses and decoupling of heavy passive neutrinos, similarly to the situation in the case of conventional see-saw. But now, in place of the conventional righthanded neutrinos, the lefthanded sterile neutrinos play the role of heavy passive neutrinos, the righthanded neutrinos and righthanded sterile neutrinos being absent. Here, the lefthanded sterile neutrinos are different from charge conjugates of conventional righthanded neutrinos because their lepton numbers differ. In this case, the neutrino mass term is necessarily of pure Majorana type.

W. Krolikowski

1999-11-02

486

Singlet Interacting Neutrinos in the Extended Zee Model and Solar Neutrino Transformation  

E-print Network

We study the impact of Standard Model singlet neutrinos on neutrino flavor transformation. We focus on an extension of the Zee model which includes singlet neutrinos, and find that the best limits on the interactions of the singlet neutrinos come from astrophysical phenomena. Singlet neutrino-electron scattering will impact both the mattter enhanced flavor transformation potential as well as detector cross sections. If electron neutrino - singlet neutrino oscillations are responsible for the solar neutrino anomaly, then the limit on the singlet neutrino interaction strength is of order of the weak interaction scale. Zee model modification of nu_tau - e scattering also impacts solar neutrino transformation, although this interaction is more tightly constrained.

G. C. McLaughlin; J. N. Ng

1999-07-21

487

Probing the absolute mass scale of neutrinos  

E-print Network

The Karlsruhe Tritium Neutrino (KATRIN) experiment is the next generation tritium beta decay experiment with sub-eV sensitivity to make a direct, model independent measurement of the neutrino mass. The principle of the ...

Formaggio, Joseph A.

488

Annual modulation of cosmic relic neutrinos  

E-print Network

The cosmic neutrino background (C?B), produced about one second after the big bang, permeates the Universe today. New technological advancements make neutrino capture on beta-decaying nuclei (NCB) a clear path forward ...

Safdi, Benjamin R.

489

Nucleosynthesis in neutrino-driven winds.  

E-print Network

??In this thesis the influence of neutrino-induced spallation rates on the nucleosynthesis is investigated. These neutrino-induced rates are studied in various nucleosynthesis processes such as… (more)

Huther, Lutz

2013-01-01

490

Neutrino mixing, flavor states and dark energy  

E-print Network

We shortly summarize the quantum field theory formalism for the neutrino mixing and report on recent results showing that the vacuum condensate induced by neutrino mixing can be interpreted as a dark energy component of the Universe.

M. Blasone; A. Capolupo; S. Capozziello; G. Vitiello

2007-11-06

491

Neutrino clustering around spherical dark matter halos  

E-print Network

Cold dark matter halos form within a smoothly distributed background of relic neutrinos -- at least some of which are massive and non-relativistic at late times. We calculate the accumulation of massive neutrinos around spherically collapsing cold dark matter halos in a cosmological background. We identify the physical extent of the "neutrino halo" in the spherical collapse model, which is large in comparison with the virial radius of the dark matter, and conditions under which neutrinos reaching the cold dark matter halo will remain bound to the halo at late times. We calculate the total neutrino mass and bound neutrino mass associated with isolated spherical halos for several neutrino mass hierarchies and provide fitting formulae for these quantities in terms of the cold dark matter halo mass and the masses of the individual neutrino species.

LoVerde, Marilena

2013-01-01

492

Neutrino physics: What makes the Sun shine  

NASA Astrophysics Data System (ADS)

Neutrinos produced in the nuclear reaction that triggers solar-energy generation have been detected. This milestone in the search for solar neutrinos required a deep underground detector of exceptional sensitivity. See Article p.383

Haxton, Wick

2014-08-01

493

Observation of electron neutrino appearance in a muon neutrino beam.  

PubMed

The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3? when compared to 4.92±0.55 expected background events. In the Pontecorvo-Maki-Nakagawa-Sakata mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles ?12, ?23, ?13, a mass difference ?m(32)(2) and a CP violating phase ?(CP). In this neutrino oscillation scenario, assuming |?m(32)(2)|=2.4×10(-3)??eV(2), sin(2)?(23)=0.5, and ?m322>0 (?m(32)(2)<0), a best-fit value of sin(2)2?(13)=0.140(-0.032)(+0.038) (0.170(-0.037)(+0.045)) is obtained at ?(CP)=0. When combining the result with the current best knowledge of oscillation parameters including the world average value of ?(13) from reactor experiments, some values of ?(CP) are disfavored at the 90% C.L. PMID:24580687

Abe, K; Adam, J; Aihara, H; Akiri, T; Andreopoulos, C; Aoki, S; Ariga, A; Ariga, T; Assylbekov, S; Autiero, D; Barbi, M; Barker, G J; Barr, G; Bass, M; Batkiewicz, M; Bay, F; Bentham, S W; Berardi, V; Berger, B E; Berkman, S; Bertram, I; Bhadra, S; Blaszczyk, F D M; Blondel, A; Bojechko, C; Bordoni, S; Boyd, S B; Brailsford, D; Bravar, A; Bronner, C; Buchanan, N; Calland, R G; Caravaca Rodríguez, J; Cartwright, S L; Castillo, R; Catanesi, M G; Cervera, A; Cherdack, D; Christodoulou, G; Clifton, A; Coleman, J; Coleman, S J; Collazuol, G; Connolly, K; Cremonesi, L; Dabrowska, A; Danko, I; Das, R; Davis, S; de Perio, P; De Rosa, G; Dealtry, T; Dennis, S R; Densham, C; Di Lodovico, F; Di Luise, S; Drapier, O; Duboyski, T; Duffy, K; Dufour, F; Dumarchez, J; Dytman, S; Dziewiecki, M; Emery, S; Ereditato, A; Escudero, L; Finch, A J; Floetotto, L; Friend, M; Fujii, Y; Fukuda, Y; Furmanski, A P; Galymov, V; Gaudin, A; Giffin, S; Giganti, C; Gilje, K; Goeldi, D; Golan, T; Gomez-Cadenas, J J; Gonin, M; Grant, N; Gudin, D; Hadley, D R; Haesler, A; Haigh, M D; Hamilton, P; Hansen, D; Hara, T; Hartz, M; Hasegawa, T; Hastings, N C; Hayato, Y; Hearty, C; Helmer, R L; Hierholzer, M; Hignight, J; Hillairet, A; Himmel, A; Hiraki, T; Hirota, S; Holeczek, J; Horikawa, S; Huang, K; Ichikawa, A K; Ieki, K; Ieva, M; Ikeda, M; Imber, J; Insler, J; Irvine, T J; Ishida, T; Ishii, T; Ives, S J; Iyogi, K; Izmaylov, A; Jacob, A; Jamieson, B; Johnson, R A; Jo, J H; Jonsson, P; Jung, C K; Kaboth, A C; Kajita, T; Kakuno, H; Kameda, J; Kanazawa, Y; Karlen, D; Karpikov, I; Kearns, E; Khabibullin, M; Khotjantsev, A; Kielczewska, D; Kikawa, T; Kilinski, A; Kim, J; Kisiel, J; Kitching, P; Kobayashi, T; Koch, L; Kolaceke, A; Konaka, A; Kormos, L L; Korzenev, A; Koseki, K; Koshio, Y; Kreslo, I; Kropp, W; Kubo, H; Kudenko, Y; Kumaratunga, S; Kurjata, R; Kutter, T; Lagoda, J; Laihem, K; Lamont, I; Laveder, M; Lawe, M; Lazos, M; Lee, K P; Licciardi, C; Lindner, T; Lister, C; Litchfield, R P; Longhin, A; Ludovici, L; Macaire, M; Magaletti, L; Mahn, K; Malek, M; Manly, S; Marino, A D; Marteau, J; Martin, J F; Maruyama, T; Marzec, J; Mathie, E L; Matveev, V; Mavrokoridis, K; Mazzucato, E; McCarthy, M; McCauley, N; McFarland, K S; McGrew, C; Metelko, C; Mezzetto, M; Mijakowski, P; Miller, C A; Minamino, A; Mineev, O; Mine, S; Missert, A; Miura, M; Monfregola, L; Moriyama, S; Mueller, Th A; Murakami, A; Murdoch, M; Murphy, S; Myslik, J; Nagasaki, T; Nakadaira, T; Nakahata, M; Nakai, T; Nakamura, K; Nakayama, S; Nakaya, T; Nakayoshi, K; Naples, D; Nielsen, C; Nirkko, M; Nishikawa, K; Nishimura, Y; O'Keeffe, H M; Ohta, R; Okumura, K; Okusawa, T; Oryszczak, W; Oser, S M; Owen, R A; Oyama, Y; Palladino, V; Paolone, V; Payne, D; Pearce, G F; Perevozchikov, O; Perkin, J D; Petrov, Y; Pickard, L J; Pinzon Guerra, E S; Pistillo, C; Plonski, P; Poplawska, E; Popov, B; Posiadala, M; Poutissou, J-M; Poutissou, R; Przewlocki, P; Quilain, B; Radicioni, E; Ratoff, P N; Ravonel, M; Rayner, M A M; Redij, A; Reeves, M; Reinherz-Aronis, E; Retiere, F; Robert, A; Rodrigues, P A; Rojas, P; Rondio, E; Roth, S; Rubbia, A; Ruterbories, D; Sacco, R; Sakashita, K; Sánchez, F; Sato, F; Scantamburlo, E; Scholberg, K; Schwehr, J; Scott, M; Seiya, Y; Sekiguchi, T; Sekiya, H; Sgalaberna, D; Shiozawa, M; Short, S; Shustrov, Y; Sinclair, P; Smith, B; Smith, R J; Smy, M; Sobczyk, J T; Sobel, H; Sorel, M; Southwell, L; Stamoulis, P; Steinmann, J; Still, B; Suda, Y; Suzuki, A; Suzuki, K; Suzuki, S Y; Suzuki, Y; Szeglowski, T; Tacik, R; Tada, M; Takahashi, S; Takeda, A; Takeuchi, Y; Tanaka, H K; Tanaka, H A; Tanaka, M M; Terhorst, D; Terri, R; Thompson, L F; Thorley, A; Tobayama, S; Toki, W; Tomura, T; Totsuka, Y; Touramanis, C; Tsukamoto, T; Tzanov, M; Uchida, Y; Ueno, K; Vacheret, A; Vagins, M; Vasseur, G; Wachala, T; Waldron, A V; Walter, C W; Wark, D; Wascko, M O; Weber, A; Wendell, R; Wilkes, R J; Wilking, M J; Wilkinson, C; Williamson, Z; Wilson, J R; Wilson, R J; Wongjirad, T; Yamada, Y; Yamamoto, K; Yanagisawa, C; Yen, S; Yershov, N; Yokoyama, M; Yuan, T; Zalewska, A; Zalipska, J; Zambelli, L; Zaremba, K; Ziembicki, M; Zimmerman, E D; Zito, M; Zmuda, J

2014-02-14

494

Observation of Electron Neutrino Appearance in a Muon Neutrino Beam  

E-print Network

The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3$\\sigma$ when compared to 4.92 $\\pm$ 0.55 expected background events. In the PMNS mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles $\\theta_{12}$, $\\theta_{23}$, $\\theta_{13}$, a mass difference $\\Delta m^2_{32}$ and a CP violating phase $\\delta_{\\mathrm{CP}}$. In this neutrino oscillation scenario, assuming $|\\Delta m^2_{32}| = 2.4 \\times 10^{-3}$ $\\rm eV^2$, $\\sin^2 \\theta_{23} = 0.5$, $\\delta_{\\mathrm{CP}}=0$, and $\\Delta m^2_{32} >0$ ($\\Delta m^2_{32} <0$), a best-fit value of $\\sin^2 2 \\theta_{13}$ = $0.140^{+0.038}_{-0.032}$ ($0.170^{+0.045}_{-0.037}$) is obtained.

Abe, K; Aihara, H; Akiri, T; Andreopoulos, C; Aoki, S; Ariga, A; Ariga, T; Assylbekov, S; Autiero, D; Barbi, M; Barker, G J; Barr, G; Bass, M; Batkiewicz, M; Bay, F; Bentham, S W; Berardi, V; Berger, B E; Berkman, S; Bertram, I; Bhadra, S; Blaszczyk, F d M; Blondel, A; Bojechko, C; Bordoni, S; Boyd, S B; Brailsford, D; Bravar, A; Bronner, C; Buchanan, N; Calland, R G; Rodríguez, J Caravaca; Cartwright, S L; Castillo, R; Catanesi, M G; Cervera, A; Cherdack, D; Christodoulou, G; Clifton, A; Coleman, J; Coleman, S J; Collazuol, G; Connolly, K; Cremonesi, L; Dabrowska, A; Danko, I; Das, R; Davis, S; de Perio, P; De Rosa, G; Dealtry, T; Dennis, S R; Densham, C; Di Lodovico, F; Di Luise, S; Drapier, O; Duboyski, T; Duffy, K; Dufour, F; Dumarchez, J; Dytman, S; Dziewiecki, M; Emery, S; Ereditato, A; Escudero, L; Finch, A J; Floetotto, L; Friend, M; Fujii, Y; Fukuda, Y; Furmanski, A P; Galymov, V; Gaudin, A; Giffin, S; Giganti, C; Gilje, K; Goeldi, D; Golan, T; Gomez-Cadenas, J J; Gonin, M; Grant, N; Gudin, D; Hadley, D R; Haesler, A; Haigh, M D; Hamilton, P; Hansen, D; Hara, T; Hartz, M; Hasegawa, T; Hastings, N C; Hayato, Y; Hearty, C; Helmer, R L; Hierholzer, M; Hignight, J; Hillairet, A; Himmel, A; Hiraki, T; Hirota, S; Holeczek, J; Horikawa, S; Huang, K; Ichikawa, A K; Ieki, K; Ieva, M; Ikeda, M; Imber, J; Insler, J; Irvine, T J; Ishida, T; Ishii, T; Ives, S J; Iyogi, K; Izmaylov, A; Jacob, A; Jamieson, B; Johnson, R A; Jo, J H; Jonsson, P; Jung, C K; Kaboth, A C; Kajita, T; Kakuno, H; Kameda, J; Kanazawa, Y; Karlen, D; Karpikov, I; Kearns, E; Khabibullin, M; Khotjantsev, A; Kielczewska, D; Kikawa, T; Kilinski, A; Kim, J; Kisiel, J; Kitching, P; Kobayashi, T; Koch, L; Kolaceke, A; Konaka, A; Kormos, L L; Korzenev, A; Koseki, K; Koshio, Y; Kreslo, I; Kropp, W; Kubo, H; Kudenko, Y; Kumaratunga, S; Kurjata, R; Kutter, T; Lagoda, J; Laihem, K; Lamont, I; Laveder, M; Lawe, M; Lazos, M; Lee, K P; Licciardi, C; Lindner, T; Lister, C; Litchfield, R P; Longhin, A; Ludovici, L; Macaire, M; Magaletti, L; Mahn, K; Malek, M; Manly, S; Marino, A D; Marteau, J; Martin, J F; Maruyama, T; Marzec, J; Mathie, E L; Matveev, V; Mavrokoridis, K; Mazzucato, E; McCarthy, M; McCauley, N; McFarland, K S; McGrew, C; Metelko, C; Mijakowski, P; Miller, C A; Minamino, A; Mineev, O; Mine, S; Missert, A; Miura, M; Monfregola, L; Moriyama, S; Mueller, Th A; Murakami, A; Murdoch, M; Murphy, S; Myslik, J; Nagasaki, T; Nakadaira, T; Nakahata, M; Nakai, T; Nakamura, K; Nakayama, S; Nakaya, T; Nakayoshi, K; Naples, D; Nielsen, C; Nirkko, M; Nishikawa, K; Nishimura, Y; O'Keeffe, H M; Ohta, R; Okumura, K; Okusawa, T; Oryszczak, W; Oser, S M; Owen, R A; Oyama, Y; Palladino, V; Paolone, V; Payne, D; Pearce, G F; Perevozchikov, O; Perkin, J D; Petrov, Y; Pickard, L J; Guerra, E S Pinzon; Pistillo, C; Plonski, P; Poplawska, E; Popov, B; Posiadala, M; Poutissou, J -M; Poutissou, R; Przewlocki, P; Quilain, B; Radicioni, E; Ratoff, P N; Ravonel, M; Rayner, M A M; Redij, A; Reeves, M; Reinherz-Aronis, E; Retiere, F; Robert, A; Rodrigues, P A; Rondio, E; Roth, S; Rubbia, A; Ruterbories, D; Sacco, R; Sakashita, K; Sánchez, F; Sato, F; Scantamburlo, E; Scholberg, K; Schwehr, J; Scott, M; Seiya, Y; Sekiguchi, T; Sekiya, H; Sgalaberna, D; Shiozawa, M; Short, S; Shustrov, Y; Sinclair, P; Smith, B; Smith, R J; Smy, M; Sobczyk, J T; Sobel, H; Sorel, M; Southwell, L; Stamoulis, P; Steinmann, J; Still, B; Suda, Y; Suzuki, A; Suzuki, K; Suzuki, S Y; Suzuki, Y; Szeglowski, T; Tacik, R; Tada, M; Takahashi, S; Takeda, A; Takeuchi, Y; Tanaka, H K; Tanaka, H A; Tanaka, M M; Terhorst, D; Terri, R; Thompson, L F; Thorley, A; Tobayama, S; Toki, W; Tomura, T; Totsuka, Y; Touramanis, C; Tsukamoto, T; Tzanov, M; Uchida, Y; Ueno, K; Vacheret, A; Vagins, M; Vasseur, G; Wachala, T; Waldron, A V; Walter, C W; Wark, D; Wascko, M O; Weber, A; Wendell, R; Wilkes, R J; Wilking, M J; Wilkinson, C; Williamson, Z; Wilson, J R; Wilson, R J; Wongjirad, T; Yamada, Y; Yamamoto, K; Yanagisawa, C; Yen, S; Yershov, N; Yokoyama, M; Yuan, T; Zalewska, A; Zalipska, J; Zambelli, L; Zaremba, K; Ziembicki, M; Zimmerman, E D; Zito, M; ?muda, J

2013-01-01

495

Neutrino-proton and anti-neutrino-proton elastic scattering  

SciTech Connect

An experiment performed at the Brookhaven National Laboratory Alternating Gradient Synchrotron observed the elastic scattering of neutrinos and anti-neutrinos from a nuclear target. The neutral current anti-neutrino to neutral current neutrino ratio is: sigma(anti ..nu..p ..-->.. anti ..nu..p)/sigma(..nu..p ..-->.. ..nu..p) = 0.45 +- 0.18 for 0.33 less than or equal to Q/sup 2/ less than or equal to 1.0 (GeV/c)/sup 2/, where Q/sup 2/ is the square of the momentum transfer to the nucleon. The neutrino neutral current to charged current ratio is: sigma(..nu..p ..-->.. ..nu..p)/sigma(..nu..n ..-->.. ..mu../sup -/p) = 0.13 +- 0.04 for 0.25 less than or equal to Q/sup 2/ less than or equal to 1.0 (GeV/c)/sup 2/. The ratios are consistent with a value of the Weinberg angle of sin/sup 2/theta/sub w/ = 0.26 +- 0.08.

Fuess, Stuart Charles

1981-01-01

496

Observation of Electron Neutrino Appearance in a Muon Neutrino Beam  

E-print Network

The T2K experiment has observed electron neutrino appearance in a muon neutrino beam produced 295 km from the Super-Kamiokande detector with a peak energy of 0.6 GeV. A total of 28 electron neutrino events were detected with an energy distribution consistent with an appearance signal, corresponding to a significance of 7.3$\\sigma$ when compared to 4.92 $\\pm$ 0.55 expected background events. In the PMNS mixing model, the electron neutrino appearance signal depends on several parameters including three mixing angles $\\theta_{12}$, $\\theta_{23}$, $\\theta_{13}$, a mass difference $\\Delta m^2_{32}$ and a CP violating phase $\\delta_{\\mathrm{CP}}$. In this neutrino oscillation scenario, assuming $|\\Delta m^2_{32}| = 2.4 \\times 10^{-3}$ $\\rm eV^2$, $\\sin^2 \\theta_{23} = 0.5$, and $\\Delta m^2_{32} >0$ ($\\Delta m^2_{32} <0$), a best-fit value of $\\sin^2 2 \\theta_{13}$ = $0.140^{+0.038}_{-0.032}$ ($0.170^{+0.045}_{-0.037}$) is obtained at $\\delta_{\\mathrm{CP}}=0$. When combining the result with the current best knowledge of oscillation parameters including the world average value of $\\theta_{13}$ from reactor experiments, some values of $\\delta_{\\mathrm{CP}}$ are disfavored at the 90% CL.

K. Abe; J. Adam; H. Aihara; T. Akiri; C. Andreopoulos; S. Aoki; A. Ariga; T. Ariga; S. Assylbekov; D. Autiero; M. Barbi; G. J. Barker; G. Barr; M. Bass; M. Batkiewicz; F. Bay; S. W. Bentham; V. Berardi; B. E. Berger; S. Berkman; I. Bertram; S. Bhadra; F. d. M. Blaszczyk; A. Blondel; C. Bojechko; S. Bordoni; S. B. Boyd; D. Brailsford; A. Bravar; C. Bronner; N. Buchanan; R. G. Calland; J. Caravaca Rodríguez; S. L. Cartwright; R. Castillo; M. G. Catanesi; A. Cervera; D. Cherdack; G. Christodoulou; A. Clifton; J. Coleman; S. J. Coleman; G. Collazuol; K. Connolly; L. Cremonesi; A. Dabrowska; I. Danko; R. Das; S. Davis; P. de Perio; G. De Rosa; T. Dealtry; S. R. Dennis; C. Densham; F. Di Lodovico; S. Di Luise; O. Drapier; T. Duboyski; K. Duffy; F. Dufour; J. Dumarchez; S. Dytman; M. Dziewiecki; S. Emery; A. Ereditato; L. Escudero; A. J. Finch; L. Floetotto; M. Friend; Y. Fujii; Y. Fukuda; A. P. Furmanski; V. Galymov; A. Gaudin; S. Giffin; C. Giganti; K. Gilje; D. Goeldi; T. Golan; J. J. Gomez-Cadenas; M. Gonin; N. Grant; D. Gudin; D. R. Hadley; A. Haesler; M. D. Haigh; P. Hamilton; D. Hansen; T. Hara; M. Hartz; T. Hasegawa; N. C. Hastings; Y. Hayato; C. Hearty; R. L. Helmer; M. Hierholzer; J. Hignight; A. Hillairet; A. Himmel; T. Hiraki; S. Hirota; J. Holeczek; S. Horikawa; K. Huang; A. K. Ichikawa; K. Ieki; M. Ieva; M. Ikeda; J. Imber; J. Insler; T. J. Irvine; T. Ishida; T. Ishii; S. J. Ives; K. Iyogi; A. Izmaylov; A. Jacob; B. Jamieson; R. A. Johnson; J. H. Jo; P. Jonsson; C. K. Jung; A. C. Kaboth; T. Kajita; H. Kakuno; J. Kameda; Y. Kanazawa; D. Karlen; I. Karpikov; E. Kearns; M. Khabibullin; A. Khotjantsev; D. Kielczewska; T. Kikawa; A. Kilinski; J. Kim; J. Kisiel; P. Kitching; T. Kobayashi; L. Koch; A. Kolaceke; A. Konaka; L. L. Kormos; A. Korzenev; K. Koseki; Y. Koshio; I. Kreslo; W. Kropp; H. Kubo; Y. Kudenko; S. Kumaratunga; R. Kurjata; T. Kutter; J. Lagoda; K. Laihem; I. Lamont; M. Laveder; M. Lawe; M. Lazos; K. P. Lee; C. Licciardi; T. Lindner; C. Lister; R. P. Litchfield; A. Longhin; L. Ludovici; M. Macaire; L. Magaletti; K. Mahn; M. Malek; S. Manly; A. D. Marino; J. Marteau; J. F. Martin; T. Maruyama; J. Marzec; E. L. Mathie; V. Matveev; K. Mavrokoridis; E. Mazzucato; M. McCarthy; N. McCauley; K. S. McFarland; C. McGrew; C. Metelko; M. Mezzetto; P. Mijakowski; C. A. Miller; A. Minamino; O. Mineev; S. Mine; A. Missert; M. Miura; L. Monfregola; S. Moriyama; Th. A. Mueller; A. Murakami; M. Murdoch; S. Murphy; J. Myslik; T. Nagasaki; T. Nakadaira; M. Nakahata; T. Nakai; K. Nakamura; S. Nakayama; T. Nakaya; K. Nakayoshi; D. Naples; C. Nielsen; M. Nirkko; K. Nishikawa; Y. Nishimura; H. M. O'Keeffe; R. Ohta; K. Okumura; T. Okusawa; W. Oryszczak; S. M. Oser; R. A. Owen; Y. Oyama; V. Palladino; V. Paolone; D. Payne; G. F. Pearce; O. Perevozchikov; J. D. Perkin; Y. Petrov; L. J. Pickard; E. S. Pinzon Guerra; C. Pistillo; P. Plonski; E. Poplawska; B. Popov; M. Posiadala; J. -M. Poutissou; R. Poutissou; P. Przewlocki; B. Quilain; E. Radicioni; P. N. Ratoff; M. Ravonel; M. A. M. Rayner; A. Redij; M. Reeves; E. Reinherz-Aronis; F. Retiere; A. Robert; P. A. Rodrigues; P. Rojas; E. Rondio; S. Roth; A. Rubbia; D. Ruterbories; R. Sacco; K. Sakashita; F. Sánchez; F. Sato; E. Scantamburlo; K. Scholberg; J. Schwehr; M. Scott; Y. Seiya; T. Sekiguchi; H. Sekiya; D. Sgalaberna; M. Shiozawa; S. Short; Y. Shustrov; P. Sinclair; B. Smith; R. J. Smith; M. Smy; J. T. Sobczyk; H. Sobel; M. Sorel; L. Southwell; P. Stamoulis; J. Steinmann; B. Still; Y. Suda; A. Suzuki; K. Suzuki; S. Y. Suzuki; Y. Suzuki; T. Szeglowski; R. Tacik; M. Tada; S. Takahashi; A. Takeda; Y. Takeuchi; H. K. Tanaka; H. A. Tanaka; M. M. Tanaka; D. Terhorst; R. Terri; L. F. Thompson; A. Thorley; S. Tobayama; W. Toki; T. Tomura; Y. Totsuka; C. Touramanis; T. Tsukamoto; M. Tzanov; Y. Uchida; K. Ueno; A. Vacheret; M. Vagins; G. Vasseur; T. Wachala; A. V. Waldron; C. W. Walter; D. Wark; M. O. Wascko; A. Weber; R. Wendell; R. J. Wilkes; M. J. Wilking; C. Wilkinson; Z. Williamson; J. R. Wilson; R. J. Wilson; T. Wongjirad; Y. Yamada; K. Yamamoto; C. Yanagisawa; S. Yen; N. Yershov; M. Yokoyama; T. Yuan; A. Zalewska; J. Zalipska; L. Zambelli; K. Zaremba; M. Ziembicki; E. D. Zimmerman; M. Zito; J. ?muda; for the T2K collaboration

2014-04-16

497

Neutrino properties and fundamental symmetries  

SciTech Connect

This is the final report of a three-year, Laboratory-Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). There are two components to this work. The first is a development of a new detection scheme for neutrinos. The observed deficit of neutrinos from the Sun may be due to either a lack of understanding of physical processes in the Sun or may be due to neutrinos oscillating from one type to another during their transit from the Sun to the Earth. The Sudbury Neutrino Observatory (SNO) is designed to use a water Cerenkov detector employing one thousand tonnes of heavy water to resolve this question. The ability to distinguish muon and tau neutrinos from electron neutrinos is crucial in order to carry out a model-independent test of neutrino oscillations. We describe a developmental exploration of a novel technique to do this using {sup 3}He proportional counters. Such a method offers considerable advantages over the initially proposed method of using Cerenkov light from capture on NaCl in the SNO. The second component of this work is an exploration of optimal detector geometry for a time-reversal invariance experiment. The question of why time moves only in the forward direction is one of the most puzzling problems in modern physics. We know from particle physics measurements of the decay of kaons that there is a charge-parity symmetry that is violated in nature, implying time-reversal invariance violation. Yet, we do not understand the origin of the violation of this symmetry. To promote such an understanding, we are developing concepts and prototype apparatus for a new, highly sensitive technique to search for time-reversal-invariance violation in the beta decay of the free neutron. The optimized detector geometry is seven times more sensitive than that in previous experiments. 15 refs.

Bowles, T.J.

1996-07-01

498

Roles within the Family  

MedlinePLUS

... Us My Cart Healthy Children > Family Life > Family Dynamics > Roles Within the Family Family Life Listen Roles Within the Family Article Body Families are not democracies. Each family has its own ways of deciding who has the power and authority within the family unit, and which ...

499

Supersymmetric Seesaw without Singlet Neutrinos: Neutrino Masses and Lepton-Flavour Violation  

Microsoft Academic Search

We consider the supersymmetric seesaw mechanism induced by the exchange of\\u000aheavy SU(2)_W triplet states, rather than `right-handed' neutrino singlets, to\\u000agenerate neutrino masses. We show that in this scenario the neutrino flavour\\u000astructure tested at low-energy in the atmospheric and solar neutrino\\u000aexperiments is directly inherited from the neutrino Yukawa couplings to the\\u000atriplets. This allows us to predict

Anna Rossi; G. Galilei

2002-01-01

500

Cosmological implications of a Relic Neutrino Asymmetry  

E-print Network

We consider some consequences of the presence of a cosmological lepton asymmetry in the form of neutrinos. Relic neutrino degeneracy enhances the contribution of massive neutrinos to the present energy density of the Universe, and modifies the power spectrum of radiation and matter. Comparing with current observations of cosmic microwave background anisotropies and large scale structure, we derive some constraints on the neutrino degeneracy and on the spectral index in the case of a flat Universe with a cosmological constant.

Julien Lesgourgues; Sergio Pastor

1999-04-20