Several rotational-band structures have recently been observed in mass Aapprox. =130 nuclei, built on multiquasiparticle states of enhanced quadrupole deformation, the so-called superdeformed states (..beta..approx. =0.4). In /sup 137/Sm, a decoupled band built on the ..nu..i/sub 13/2/(660)(1/2/sup +/ single-quasineutron orbital, ...

Previous surveys of experimental level structure in deformed odd-odd nuclei have been updated with recent results for the lanthanide and actinide regions. The relative strengths of the effective neutron-proton interaction derived from these data are compared. The predictive power of a semi-empirical model for level structure in deformed ...

Previous surveys of experimental level structure in deformed odd-odd nuclei have been updated with recent results for the lanthanide and actinide regions. The relative strengths of the effective neutron-proton interaction derived from these data are compa...

... Descriptors : *PROTON REACTIONS, *NEUTRON REACTIONS, ODD ODD NUCLEI, NUCLEAR SHELL MODELS, NUCLEAR SHELL MODELS ...

Particle-core coupling calculations on heavy odd-odd and odd-even Sb nuclei have been carried out, starting from a shell-model description. Starting from a description of the core system (Sn nuclei) and a multipole-multipole proton-neutron interaction, we...

Odd-odd nuclei are modeled by the application of symmetries and supersymmetries in IBM/IBFM. Odd-odd nuclei are described as a mixed system if bosons and fermions by a Hamiltonian consisting of three contributions: the IBM Hamiltonian, a one-fermion and fermion-fermion interaction terms, and a boson-fermion ...

An experiment has been performed in beam via the (sup 165)Ho((sup 24)Mg,5n)(sup 184)Au reaction using the 'Chateau de Cristal' multi-detector in Orsay. We have identified in (sup 184)Au some structures already observed in the neighboring odd-odd nuclei. (...

The application of a simple semi-empirical model is discussed in terms of interpreting experimental nuclear structure data for twelve of the best characterized odd-odd deformed nuclei. An essential part of this modeling is to calculate values for the Gall...

The application of a simple semi-empirical model is discussed in terms of interpreting experimental nuclear structure data for twelve of the best characterized odd-odd deformed nuclei. An essential part of this modeling is to calculate values for the Gall...

A pair of degenerate dipole bands with negative parity have been established in 106In. Projected deformed Hartree-Fock calculations were carried out in order to understand the configurations of these bands and similar structures in neighbouring odd-odd nuclei.

The low-energy levels of /sup 234/Pa are discussed in terms of the unified model, specially arranged to describe odd-odd deformed nuclei. The agreement between theoretical and experimental results is quite sntisfactory. (auth)

A description of collective states in self-conjugate nuclei is proposed, both odd-odd and even-even, in terms of an interacting isoscalar p-boson model. Within this model, two limiting cases can be identified with the anharmonic vibrator and axial rotor l...

The theoretical calculations of ?-decay half-lives for three kinds of ?-emitters (even-even, even-odd, odd-odd nuclei) are systematically reviewed within the framework of the density-dependent cluster model (DDCM). The half-lives of three typical ?-emitters (8Be, 212Po, and 270Ds) are discussed in detail. The good agreement between ...

The main topic of this work is the study of the low-spin and high-spin states of the transitional odd-odd nucleus (sup 184)Au. This nucleus has been studied from the (beta)(sup +)/CE decay of (sup 184)Hg produced by the (sup 148)Sm((sup 40)Ar,4n) reaction...

We investigate the role of two-quasiparticle isomeric states along the proton drip line, using configuration-constrained potential-energy-surface calculations. In contrast to even-even nuclei, odd-odd nuclei can have coexisting low-lying two-quasiparticle states. The low excitation energy and high angular momentum can lead to ...

The experimentally observed {delta}I=1 doublet bands in some odd-odd nuclei are analyzed within the orthosymplectic extension of the interacting vector boson model (IVBM). A new, purely collective interpretation of these bands is given on the basis of the obtained boson-fermion dynamical symmetry of the model. It is illustrated by its application to three ...

We have carried out a fully microscopic description of particle-core coupling calculations on heavy-odd-mass Sb nuclei. Using a shell-model description of the core system (Sn nuclei) and a separable multipole-multipole (lambda=2+3) proton neutron interact...

An attempt is made to calculate excited levels of nuclei in the intermediate mass region with the assumption that protons and neutrons are placed in different subshells. Residual interactions between all external nucleons are assumed and treated as a per turbation. Neither a senioritv quantum number equal to one nor odd-odd ...

On the basis of the comparison of the hitherto experimentally found gamma transitions in even-odd (odd neutron) and even-even nuclei with A < 60, the presence of nuclear multiplets near the ground state is proved. The following nuclei were investigated: Na/sup 24/, Mg/sup 25/, Al/sup 28/, Si/sup 29/ , ...

Rotational bands with K? = 1+ in the odd-odd nuclei 100,10239Y and 102,10441Nb are postulated from ?- decay of t heir even-even parents. Each two-quasiparticle band has a moment of inertia very close to that of a rigid spheroidal nucleus with deformation ? ~ 0.3, hence these bands are nearly ``pairing free''.

Odd-odd nuclei have been studied by heavy ion nuclear reactions, particularly Indium 108. In odd nuclei, the rotor plus particle model gave good results and coupled or uncoupled bands were possible to predict. In the case of this nucleus, the presence of ...

On the basis of existing experimental data for BETA and gamma spectra, the level schemes were plotted for the deformed nuclei Gd/sup 154/, Gd/ sup 156/, Er/sup 168/, W/sup 184/, W/sup 186/, U/s up 232/, and Pu/sup 240/. The diagram of the energy level dependence on the number of neutrons and, consequently, on the parameter of deformation is included. (R.V.J.)

The excited levels of the exp 140 Pm and exp 186 Au odd-odd transitional nuclei have been studied by means of two complementary methods: the low-spin states populated by the beta exp + +CE decay of exp 140 Sm and exp 186 Hg respectively, the high-spin sta...

Results of beta-gamma directional-correlation measurements in the nonuniquem first-forbidden beta decay of the ground states of several odd-odd nuclei (Sb124, Eu152, Re186, Tm170, Rb84) to the first 2 levels in the even-even daughter nuclei are presented....

The high-spin structure of the N{approx_equal}Z nuclei {sup 62,64,65}Ga have been investigated using the EUROBALL array coupled to the ISIS Si-ball. The collective bands of such nuclei are then compared showing an unexpected behavior.

The high-spin structure of the N {approx_equal} nuclei {sup 62,64,65}Ga have been investigated using the EUROBALL array coupled to the ISIS Si-ball. The collective bands of such nuclei are then compared showing an unexpected behavior.

The nuclear gross theory, originally formulated by Takahashi and Yamada (1969 Prog. Theor. Phys. 41 1470) for the ?-decay, is applied to the electronic-neutrino nucleus reactions, employing a more realistic description of the energetics of the Gamow-Teller resonances. The model parameters are gauged from the most recent experimental data, both for ?--decay and electron capture, separately for ...

Reeves, Fowler, and Hoyle have suggested that the light nuclei could be synthesized by mutual spallation of the cosmic rays and the interstellar medium. Preliminary work by Audouze showed that the rare odd-odd nuclides /sup 50/V and /sup 180/Ta might also be produced by this process. An integral is performed over all cosmic-ray energies, utilize the newly ...

The rotational schemes of Eu/sup 152/, Eu/sup 154/, Lu/sup 174/, Lu/sup 176/ Ta/sup 182/, and Re/sup 188/ are developed, and the energy of the rotational levels is evaluated. (R.V.J.)

We have calculated isomer ratios for the sup 175 Lu(n, gamma ), sup 175 Lu(n,2n), sup 237 Np(n,2n), sup 241 Am(n, gamma ), and sup 243 Am(n, gamma ) reactions using modeled level structures in the deformed, odd-odd product nuclei. We find: that the hundre...

A unified description of the following classes of nuclear collective states in terms of an interacting sp-boson model is proposed: (i) Low-lying collective states in the light nuclei, both odd-odd and even-even; (ii) Giant multipole resonances (GMR), and ...

A study of inelastic scattering ( alpha , alpha ') By Cu/sup 63/, Cu/sup 65/, and Fe/sup 57/ shows the existence of two families of multiplets. They can be interpreted as being caused by the coupling of the celibate nucleon to the collective quadrupole and octupole vibrations of the corresponding even-even core. (tr-auth)

The low-lying structures of the self-conjugate (N=Z) nuclei 8241Nb41 and 8643Tc43 have been investigated using isomeric-decay spectroscopy following the projectile fragmentation of a 107Ag beam. These represent the heaviest odd odd N=Z nuclei in which internal decays have been identified to date. The resulting ...

The issue of correlations between protons and neutrons has become a major focus of nuclear structure research along the proton dripline. The strength of these correlations determined when nuclear binding ends. The correlations can have isospin T=1, just like 'normal' neutron-neutron and proton-proton pairs, or have more exotic structure in a deuteron-like T=0 configuration. I ...

We have utilized a rapid-transport target system together with a ..beta..-ray range telescope to remeasure the half-lives of the N = Z, odd-odd nuclei /sup 66/As and /sup 70/Br. We find they are 95.77 +- 0.28 ms and 78.54 +- 0.59 ms, respectively. The /sup 66/As result is in good agreement with the previous study, while the /sup 70/Br measurement differs ...

We have experimentally studied the high spin states in ten odd-odd nuclei at the beginning of the deformed rare earth region: sup 150 Eu, sup 152 Eu, sup 152 Tb, sup 154 Tb, sup 156 Tb, sup 160 Ho and sup 158 Tm, sup 160 Tm, sup 162 Tm, sup 164 Tm. The co...

The ?+ decay of the N = Z odd-odd nuclei 62Ga and 70Br has been investigated at the on-line mass separator of GSI Darmstadt. The nuclei were produced by using beams of 36Ar on 28Si and 40Ca targets. In the decay of 62Ga, besides an intense 511 keV annihilation peak, the 954 keV 2+ ? 0+ transition in 62Zn has been observed weakly, ...

The 106, 108Rh and 110, 112Ag nuclei have been produced as fission fragments following the fusion reaction 28Si + 176Yb at 145 MeV bombarding energy and studied with the Eurogam2 array. The yrast high-spin states of these four odd-odd nuclei, which are observed for the first time, consist of rotational bands in which the odd proton ...

The ?+-decay half-lives of the neutron-deficient odd-odd N=Z nuclei 74Rb, 78Y, 82Nb, and 86Tc have been measured following the fragmentation of a primary 92Mo beam at an energy of 60 MeV per nucleon at the GANIL laboratory, France. This was achieved by correlating ?+ decays with the implantation of unambiguously identified fragments at the final focus of ...

The spectroscopy and structure of excited states of N sim Z nuclei in the mass 70-100 region has been investigated using two techniques. In the A sim 70-80 region fusion evaporation reactions coupled with the recoil- beta -tagging method have been employed at Jyvaskyla to study low-lying states in odd-odd N = Z nuclei. Results from these and other data for ...

This study presents the calculation of strength functions for neutron-proton pair transfer on 82Se, 96Mo, 116Cd and 128Te even-even nuclei. We study 1+ states, which are a part of the Gamow-Teller (GT) giant resonances in neighboring odd-odd nuclei, excited via the neutron-proton pair transfer on even-even parent ...

A Dirac-Hartree-Bogoliubov formalism for axially deformed nuclei is used to study the ground-state properties of odd-even and odd-odd mass nuclei. The effect of odd proton/neutron numbers is treated by using a self-consistent Dirac quasi-particle blocking method. The approach is tested by studying the ground-state properties of known medium-mass ...

We study the effect of isospin impurity on the superallowed Fermi {beta} decay using the microscopic Hartree-Fock and random phase approximation (or Tamm-Dancoff approximation) model taking into account charge symmetry and independence breaking interactions. It is found that the isospin impurity of {ital N}={ital Z} nuclei gives enhancement of the sum rule of Fermi transition ...

Microsecond isomers of neutron-rich nuclei in masses A=96 and 98 were reinvestigated at the Institut Laue-Langevin reactor (Grenoble). These nuclei were produced by thermal-neutron induced fission of 241Pu. The detection is based on the time correlation between fission fragments selected by the Lohengrin mass spectrometer and the ? rays and conversion ...

Odd-odd nuclei are very complicated systems because many coupling schemes are possible between the various quasi-particle configurations. By studying these nuclei one can test different coupling schemes and their effects on the nuclear structure, e.g., the blocking effect. The previously unknown odd-odd nucleus ...

Low energy neutron capture gamma rays were used to investigate the odd- odd nuclei Ho/sup 166/, Tm/sup 170/, and Lu/sup 176/. The samples were in the form of powdered oxides pressed into aluminum containers. They were bombarded by a neutron beam with thermal flux 4 x 10/sup 12/ n cm/sup -2/ s/sup -1/ at 100 kw thermal power. ...

An analysis of Gamow--Teller {beta}-decay data is used to derive information on the structure of {ital J}=1 levels in {ital sd}-shell {ital T}=0 odd-odd nuclei within the context of an extended Interacting Boson Model (IBM-4), particular on the relation of their orbital wavefunctions to those of levels in the neighboring {ital T}=1 systems. The data ...

Some aspects of the importance of neutrino-induced reactions on nuclei within supernova physics are discussed. It is argued that important constraints on the experimentally unknown cross sections can be obtained from experimental studies of the nuclear response in selected cases. Examples are neutral-current induced reactions on fp-shell nuclei extracted ...

The heavy odd-odd N=Z nuclei 78Y,82Nb,86Tc have been produced at GANIL by fragmentation of a 60 MeV/u 92Mo beam on a natural nickel target. Their lifetime have been measured for the first time, using the identification-implantation and subsequent time correlated ? counting technique at the LISE spectrometer. The obtained half-lives for 78Y,82Nb,86Tc are ...

The study of the {beta} decay of some N=Z nuclei in the A=70 mass range have been performed using the GANIL and CERN/ISOLDE facilities. The fast decays of three T{sub z}=0 odd-odd nuclei have been measured for the first time which extend the number of superallowed transitions. Information has been obtained on the Gamow Teller strength ...

The study of the {beta} decay of some N=Z nuclei in the A=70 mass range have been performed using the GANIL and CERN/ISOLDE facilities. The fast decays of three T{sub z}=0 odd-odd nuclei have been measured for the first time which extend the number of superallowed transitions. Information has been obtained on the Gamow Teller strength ...

Evidence is presented for the existence of odd-even staggering in/ital K//sup /minus// rotational bands (with /ital K//gt/0) of odd-odd nuclei in therare-earth and actinide regions. Coriolis-coupling calculations have beencarried out for rotational bands in /sup 168/Tm,/sup 176/Lu, /sup 182/Ta, and /sup 182/Re.With these calculations, we are able to reproduce the odd-even ...

The single-state-dominance hypothesis (SSDH) states that the decay rates of the two-neutrino double-beta decay are governed by a virtual two-step transition connecting the initial and final ground states through the first 1+ state, 1+1, of the intermediate odd-odd nucleus, for those odd-odd nuclei where the 1+1 state is the ground ...

Proton decay from odd-odd deformed nuclei is a long-standing unsolved problem. We present for the first time an exact solution using single particle Nilsson resonances. The lifetime is found to depend strongly on the single particle level occupied by the unpaired neutron, allowing a clear assignment of its Nilsson level. The emitters 112Cs, 140Ho, 150Lu, ...

In order to find the selection rules that can be applied to the electromagnetic transitions when the chiral geometry is achieved, a model for a special configuration in triaxial odd-odd nuclei is constructed which exhibits degenerate chiral bands with a sizable rotation. A quantum number obtained from the invariance of the Hamiltonian is given and the ...

A number of new isotopes in the iron region, both neutron-rich and proton-rich, have been produced at the Argonne FN tandem using heavy-ion beams. On the neutron-rich side, masses and beta-decay schemes were obtained, and the masses will be compared with various mass formulae used in nucleosynthesis calculations. Several heavy proton-rich N = Z odd-odd ...

Detailed fine-structure ?-decay studies of 188,190Bi were performed using the complete-fusion reactions of 50,52Cr ions with a 142Nd target at the velocity filter SHIP. The evaporation residues were separated in-flight and subsequently identified on the basis of recoil-?, recoil-?-?/X-ray and excitation function measurements. Improved data on the ?-decay of 188,190Bi were obtained and a number of ...

Self-conjugate nuclei are unique laboratory systems which allow specific facets of nuclear structure to be explored. Shell gaps present in the single-particle spectra are reinforced by both proton and neutron Fermi levels. As a result of this localized occupation, proton-neutron correlations can contribute to the overall pairing energy resulting in a more stable system. ...

Radioactive ion beam production and development at the Holifield Radioactive Ion Beam Facility (HRIBF) will be detailed in a talk at this conference. A highlight during this period, however, has been providing A{approx}130 neutron-rich RIBs at energies up to {approx}4 MeV/nucleon. At the present time, the HRIBF is the only facility in the world capable of providing such beams.

A systematic numerical investigation of a recently developed nuclear structure approach is presented which diagonalizes the Hamiltonian in the space of the symmetry-projected Hartree-Fock-Bogoliubov (HFB) vacuum and symmetry-projected quasiparticle excitations with respect to it. The underlying HFB transformation, which is assumed to be time-reversal and axially symmetric, is determined by ...

After bombarding an enriched /sup 70/Zn target with 14-MeV neutrons, / sup 70/Cu was identified by means of a rapid radiochemical scparation method. The 42 plus or minus 3 s activity previously observed belongs to /sup 70/Cu Systematic comparison of its half-life with those of neighboring comparable (odd - -odd) nuclei ...

Cross sections of the {sup 139}La({gamma},n) and {sup 141}Pr({gamma},n) reactions were measured using quasi-monochromatic {gamma}-ray beams from laser Compton scattering. The results are compared to the predictions of Hauser-Feshbach statistical calculations using different models for the {gamma}-ray strength function. The model parameters are constrained by the present experimental data and used ...

In VNIIEF there were measured cross-sections of {sup 232}Pa and {sup 238}Np fission caused by thermal neutrons. The obtained data do not agree with the results of measurements carried out in Los Alamos National Laboratory (USA). Possible reasons of the result divergence are discussed. There are considered the measurement prospects for fission and radiation capture cross-sections of thermal ...

We have calculated isomer ratios for the /sup 175/Lu(n,..gamma..), /sup 175/Lu(n,2n), /sup 237/Np(n,2n), /sup 241/Am(n,..gamma..), and /sup 243/Am(n,..gamma..) reactions using modeled level structures in the deformed, odd-odd product nuclei. We find: that the hundreds of discrete levels and their gamma-ray branching ratios provided by the modeling are ...

The Gamow-Teller strength distributions below the particle threshold in {sup 138}La and {sup 180}Ta, deduced from high-resolution measurements of the ({sup 3}He,t) reaction at 0 deg., allow us to evaluate the role of charged-current reactions for the production of these extremely rare nuclides in neutrino-nucleosynthesis models. The analysis suggests that essentially all {sup 138}La in the ...

Gamma decays depopulating excited states in the odd-odd N=Z - 2 nucleus 48Mn have been observed for the first time. The yrast band has been built up from the 4+ ground state to 13+, just shy of the expected band termination at 15+. When compared with its mirror, 48V, the Coulomb energy differences are unlike any other previously measured which, until now, have been dominated by a sudden rotational ...

Gamma decays depopulating excited states in the odd-odd N=Z - 2 nucleus 48Mn have been observed for the first time. The yrast band has been built up from the 4+ ground state to 13+, just shy of the expected band termination at 15+. When compared with its mirror, 48V, the Coulomb energy differences are unlike any other previously measured which, until now, have been dominated by a sudden rotational ...

An atomic mass formula consisting of a gross part, and averge even-odd part and an empirical shell part is studied. The gross part is, apart from a small atomic term, taken to be the sum of nucleon rest masses. Coulomb energies and a polynomial in A1/3 and ||N-Z||/A. The shell part includes, in addition to proton and neutron support of nuclear magicities and the cooperative deformation effect. ...

We have performed a series of high sensitivity ? spectroscopic and fast timing studies at the OSIRIS fission product mass separator at Studsvik, that provides new spectroscopic information on 132,134Sb and 130,135Sn. In particular for 132Sb, we report a tentative identification of the 2-, 3-, 4-, 5- and 6- members of the ? h11/2-1 ? g7/2 multiplet. This nucleus is of strong theoretical interest ...

The (p, t) reaction is employed for the first time to study the structure of the deformed, rare-earth, odd-odd nucleus, /sup 174/Lu. In addition to a number of level that have been characterized in previous studies, we have seen the rotational band built on the (..pi..7/2 + (404), ..nu..7/2 - (514))/sub K7 configuration. This band is about 6% admixed with the (..pi..7/2 + ...

This report will cover four topics: 1) The development of catcher techniques to detect shortlived particle radioactivities. With this setup proton emission from 113Cs and 109I has been observed for the first time (1983). Their slow decay rate has been realized and for the first time expressed in terms of a spectroscopic factor. 2) A discussion of various types of recoil separation schemes and ...

High-spin states in neutron-rich nuclei, populated following deep-inelastic multi-nucleon transfer, have been studied using the GAMMASPHERE array at the LBNL, USA. A 64Ni beam at an energy 15% above the Coulomb barrier was incident upon a thick 208Pb target, leading to the population of more than 130 different nuclei. The strongest channels correspond to ...

The application of a simple semi-empirical model is discussed in terms of interpreting experimental nuclear structure data for twelve of the best characterized odd-odd deformed nuclei. An essential part of this modeling is to calculate values for the Gallagher-Moszkowski splittings and Newby shifts, the observables that arise from the n-p residual ...

We present a new effective interaction for shell-model calculations in the model space consisting of the single-particle orbits 1p{sub 3/2}, 0f{sub 5/2}, 1p{sub 1/2}, and 0g{sub 9/2}. Starting with a realistic interaction based on the Bonn-C potential, 133 two-body matrix elements and four single-particle energies are modified empirically so as to fit 400 experimental energy data out of 69 ...

We present a new effective interaction for shell-model calculations in the model space consisting of the single-particle orbits 1p3/2, 0f5/2, 1p1/2, and 0g9/2. Starting with a realistic interaction based on the Bonn-C potential, 133 two-body matrix elements and four single-particle energies are modified empirically so as to fit 400 experimental energy data out of 69 nuclei ...

The quasi-/SU(3) symmetry, as found in shell-model calculations, refers to the dominance of the single-particle plus quadrupole-quadrupole terms in the Hamiltonian used to describe well-deformed nuclei, and to the subspace relevant in its diagonalization. It provides a very efficient basis truncation scheme. It is shown that a small number of /SU(3) coupled irreps, those with ...

The effective interaction GXPF1 for shell-model calculations in the full pf shell is tested in detail from various viewpoints such as binding energies, electromagnetic moments and transitions, and excitation spectra. The semimagic structure is successfully described for N or Z=28 nuclei, 53 Mn , 54 Fe , 55 Co , and 56,57,58,59 Ni , suggesting the existence of ...

Almost 3 decades after the discovery of deformed, intruder-dominated ground states in nuclei with Z � 10 and N � 20, many questions remain about the behavior of the N = 20 shell gap and how correlation effects can bridge the gap in this region of nuclei, later dubbed the ``Island of Inversion,'' because intruder states expected to lie at higher ...

The heavy odd-odd N=Z nuclei {sup 78}Y,{sup 82}Nb,{sup 86}Tc have been produced at GANIL by fragmentation of a 60 MeV/u {sup 92}Mo beam on a natural nickel target. Their lifetime have been measured for the first time, using the identification-implantation and subsequent time correlated {beta} counting technique at the LISE spectrometer. The obtained ...

The heavy odd-odd N=Z nuclei {sup 78}Y,{sup 82}Nb,{sup 86}Tc have been produced at GANIL by fragmentation of a 60 MeV/u {sup 92}Mo beam on a natural nickel target. Their lifetime have been measured for the first time, using the identification-implantation and subsequent time correlated {beta} counting technique at the LISE spectrometer. The obtained ...

The previously unreported decay of 102Sr to levels in 102Y has been studied from mass-separated activity produced in the thermal neutron fission of 235U. A half-life for 102Sr was measured to be 68+/-8 ms. Based on ? singles and coincidence measurements, 24 ? rays were placed in a level scheme for 102Y with nine excited states up to 1689 keV. Four excited states were assigned a J? of 1+ from logft ...

The previously unreported decay of /sup 102/Sr to levels in /sup 102/Y has been studied from mass-separated activity produced in the thermal neutron fission of /sup 235/U. A half-life for /sup 102/Sr was measured to be 68 +- 8 ms. Based on ..gamma.. singles and coincidence measurements, 24 ..gamma.. rays were placed in a level scheme for /sup 102/Y with nine excited states up to 1689 keV. Four ...

Microsecond isomers of neutron-rich nuclei in masses A=96 and 98 were reinvestigated at the Institut Laue-Langevin reactor (Grenoble). These nuclei were produced by thermal-neutron induced fission of {sup 241}Pu. The detection is based on the time correlation between fission fragments selected by the Lohengrin mass spectrometer and the {gamma} rays and ...

The structure of the {Delta}J=1 doublet bands in {sup 128}Cs is investigated within the framework of the interacting vector boson-fermion model. A new, purely collective interpretation of these bands is given on the basis of the used boson-fermion dynamical symmetry of the model. The energy levels of the doublet bands as well as the absolute B(E2) and B(M1) transition probabilities between the ...

We have performed shell-model calculations for the three odd-odd nuclei {sup 100}In, {sup 102}In, and {sup 98}Ag, with neutron particles and proton holes around {sup 100}Sn. We have used a realistic effective interaction derived from the CD-Bonn nucleon-nucleon potential, the neutron-proton channel being explicitly treated in the particle-hole formalism. ...

Recently, a band suspected to be based on the [431]1/2^+ configuration in ^79Sr has been shown to correspond to a very highly-deformed shape, but the parity of this band has never been measured directly. The yrast band in ^80Y is expected to have positive parity based on theoretical calculations and systematic evidence collected from other neighboring nuclei, but this also has ...

Excited states have been observed in the N=Z-2 odd-odd nucleus 48Mn for the first time. Through comparison with the structure of 48V, a first high-spin study of an odd-odd mirror pair has been achieved. Differences between the T=1 analogue states in this pair have been interpreted in terms of Coulomb effects, with the aid of shell-model calculations in the full pf valence ...

Excited states have been observed in the N=Z-2 odd-odd nucleus {sup 48}Mn for the first time. Through comparison with the structure of {sup 48}V, a first high-spin study of an odd-odd mirror pair has been achieved. Differences between the T=1 analogue states in this pair have been interpreted in terms of Coulomb effects, with the aid of shell-model calculations in the full pf ...

Excited states have been observed in the N=Z-2 odd-odd nucleus Mn48 for the first time. Through comparison with the structure of V48, a first high-spin study of an odd-odd mirror pair has been achieved. Differences between the T=1 analogue states in this pair have been interpreted in terms of Coulomb effects, with the aid of shell-model calculations in the full pf valence ...

In a basis defined by the {SO_{sd}(36) supset SO_{s}(6) oplus SO_{d}(30)} symmetry limit of the spin-isospin invariant interacting boson model with s and d bosons (sdIBM-ST), and employing a Hamiltonian with a mixing parameter that controls the competition between isoscalar vs isovector pairing, deuteron transfer intensities are predicted, extending the results in the exact symmetry limit, for N = ...

From the anomalies in the beta -decays of Pb/sup 210/ and Bi/sup 210/, relations between the shell model wave functions of the ground states of Pb/sup 210/, Bi/sup 210/, and Po/sup 210/ are derived. These relations are however not satisfied by wave functions calculated under the assumption of two-body central forces of zero range. Use was made of the fact that such forces seem to be a ...

The quasistable odd-odd-mass nucleus {sup 176}Lu is of special interest in nuclear structure physics and, above all, in nuclear astrophysics. Systematic photon scattering experiments have been performed at the bremsstrahlung facility of the 4.3-MV Stuttgart Dynamitron accelerator with bremsstrahlung end-point energies of 2.3 and 3.1 MeV to determine the low-energy dipole ...

Two strongly coupled bands with large dynamic moment of inertia values have been observed for the first time in the neutron-deficient odd-odd nucleus {sup 130}Pr using Gammasphere and the Microball charged-particle detector array. These bands involve the important g{sub 9/2}[404]9/2 proton orbital. This new information on {sup 130}Pr coupled with Projected Shell Model ...

Precise measurements of superallowed ? decays provide demanding test of the fundamental symmetries of the electroweak interaction. Collectively, the corrected comparative half-lives of these transitions allow a sensitive probe of the CVC hypothesis. Moreover, by providing the most accurate determination of Vud, the up-down quark-mixing element, these data serve as a stringent test of the unitarity ...

Our main concern in this work is to show how higher shell admixtures affect the spectrum of a Q{center_dot}Q interaction. We first review how, in the valence space, the familiar SU(3) result for the energy spectrum can be obtained using a coordinate space Q{center_dot}Q interaction rather than the Elliott one which is symmetric in r and p. We then reemphasize that the Elliott spectrum goes as ...

Precise measurements of the intensities for superallowed Fermi 0^+ arrow 0^+ ? decays have provided a demanding test of the CVC hypothesis at the level of 3x10-4 and also led to a result in disagreement with unitarity (at the 98% confidence level) for the CKM matrix^1. Since this would have profound implications for the minimal Standard Model it is essential to address possible "trival" ...

We describe our in-beam superconducting conversion electron spectrometer and its use in a (t,p) proton-conversion electron coincidence mode. Several examples of completed and on-going investigations are presented. These include: E0 strength from the /sup 238/U fission isomer; electromagnetic properties of the J/sup ..pi../ = 6/sup +/ and 8/sup +/ states of /sup 210/Pb; single particle and cluster ...

The high spin states in the N=79 odd-odd 136La nucleus have been investigated by in-beam ?-spectroscopic techniques following the 130Te(11B, 5n)136La reaction at E=52 MeV using an array, consisting of eight Compton-suppressed clover germanium detectors. Thirty nine new ? rays have been assigned to 136La on the basis of ? ray singles and ??-coincidence data. The level scheme of ...

Excited states in 188Tl have been studied experimentally using the 157Gd (35Cl, 4n) reaction at a beam energy of 170MeV. A rotational band built on the ?h 9/2 ? ?i 13/2 configuration with oblate deformation has been established for 188Tl. Based on the structure systematics of the oblate ?h 9/2 ? ?i 13/2 bands in the heavier odd-odd Tl nuclei, we have ...

Isomer ratio calculations were made for the reactions: /sup 175/Lu(n,..gamma..)/sup 176m,g/Lu, /sup 175/Lu(n,2n)/sup 174m,g/Lu, /sup 237/Np(n,2n)/sup 236m,g/Np, /sup 241/Am(n,..gamma..)/sup 242m,g/Am, and /sup 243/Am(n,..gamma..)/sup 244m,g/Am using modeled level structures in the deformed, odd-odd product nuclei. The hundreds of discrete levels and their ...

The very neutron deficient odd-odd nucleus Au172 was studied in reactions of 342 and 348 MeV Kr78 beams with an isotopically enriched Ru96 target. The ? decays previously reported for Au172 were confirmed and the decay chain extended down to Tm152 through the discovery of a new ?-decaying state in Re164 [E?=5623(10) keV; t1/2=864-110+150 ms; b?=3(1)%]. Fine structure in these ...

An atomic mass formula consisting of a gross part, and averge even-odd part and an empirical shell part is studied. The gross part is, apart from a small atomic term, taken to be the sum of nucleon rest masses. Coulomb energies and a polynomial in A/sup 1/3/ and chemically bondN-Zchemically bond/A. The shell part includes, in addition to proton and neutron support of nuclear magicities and the ...

Ground-state nuclear spins of 13 radioactive rare earths (lanthanides) were measured by the atomic-beam magneticresonance method. Ground levels and corresponding g values were determined, and ground-state electroric configurations were inferred for Pm, Dy, Ho, and Er. In addition, electronic properties were verified for Pr, Nd, Sm, Gd, Tb, and Tl. The following isotopes were used in ...

Mean lifetimes of 10 states in 78Rb have been measured using the recoil-distance method. The ?-ray spectra of the recoils produced following the 58Ni(23Na,2pn)78Rb reaction at 70 MeV were observed in prompt coincidence using the FSU plunger in the Pitt-FSU detector array. Different decay curves in different coincidence gates provide additional confirmation for the 153 keV doublet in the level ...

Neutron deficient nuclei near 100Sn have been produced by projectile fragmentation of a 1 A-GeV 112Sn beam in a beryllium target. The fragments were separated in the magnetic spectrometer FRS at GSI, Darmstadt. The unambiguously identified ions were stopped in a highly segmented silicon strip detector stack which was designed to measure the halflives and the total energy of ...

Neutron deficient nuclei near 100Sn have been produced by fragmentation of a 1 . AGeV 112Sn beam. The fragments were separated, identified and stopped in a highly segmented silicon strip detector stack. This detector measured the total energy of emitted ?+-particles. ?-radiation was measured with surrounding detectors. The half-lives for many nuclides have been determined for ...

The 1960 version of Nuclear Data Sheets for A = 120 has been revised on the basis of experimental data received prior to September 1, 1975. Results from approximately 130 papers and communications have been included in the present evaluation. Data on ten A = 120 nuclei are presented. Two $beta$-decaying isomers are known for each of the odd-odd ...

The cosmological origins of the two heaviest odd-odd nuclei {sup 138}La and {sup 180}Ta are believed to be closely related to the neutrino process. We investigate in detail neutrino-induced reactions on the nuclei. Charged current (CC) reactions {sup 138}Ba({nu}{sub e},e{sup -}){sup 138}La and {sup 180}Hf({nu}{sub e},e{sup -}){sup ...

The cosmological origins of the two heaviest odd-odd nuclei La138 and Ta180 are believed to be closely related to the neutrino process. We investigate in detail neutrino-induced reactions on the nuclei. Charged current (CC) reactions Ba138(?e,e-)La138 and Hf180(?e,e-)Ta180 are calculated using the standard quasi-particle random phase ...

This report will cover four topics: (1) The development of catcher techniques to detect shortlived particle radioactivities. With this setup proton emission from {sup 113}Cs and {sup 109}I has been observed for the first time (1983). Their slow decay has been realized and for the first time expressed in terms of a spectroscopic factor. (2) A discussion of various types of recoil separation schemes ...

In the present article, we study systematically the influence of different types of perturbations on the SU/sup */(3) dynamical symmetry. Both a Majorana perturbation, a d-boson energy perturbation, and the SU/sup */(3)..-->..O(6) and SU/sup */(3)..-->..SU(3) transitions are considered. In all cases, we study the variation of the ground and gamma bands as well as some important ...

The luminescence of single crystals of CuGaS/sub 2/ grown by iodine-vapor transport was studied. As-grown crystals and crystals annealed in S, Ga, or in a vacuum were used. The crystals annealed in S showed a very intensive green luminescence, which was ascribed to donor-acceptor pair transitions interacting with lattice phonons. Studies in terms of excitation intensity, temperature, and time ...

To continue their systematic study of odd-odd nuclei in the mass 160 region, and to further investigate the abnormal band-crossing frequencies observed in a number of odd-odd Tm and Lu isotopes, the authors studied {sup 158}Ho and {sup 156}Ho recently at the Lawrence Berkeley Laboratory. High spin states of {sup 158}Ho and {sup 156}Ho were populated using the {sup 150}Nd({sup ...

Gamow-Teller (GT) strength transitions are an ideal probe for testing nuclear structure models. In addition to nuclear structure, GT transitions in nuclei directly affect the early phases of Type Ia and Type-II supernovae core collapse since the electron capture rates are partly determined by these GT transitions. In astrophysics, GT transitions provide an important input for ...

The triaxial superdeformed rotational bands in the odd-odd Lu160�168 isotopes are investigated by performing the configuration dependent three-dimensional total routhian surface calculations. About fifty low lying triaxial superdeformed bands have been found for these odd-odd nuclei within the excitation energy of 3 MeV above the normal deformed yrast bands. The calculated ...

Beta-delayed proton decay was observed in 148Ho, 150Tm, and 152Lu for the first time. Contrary to neighboring even-Z N=81 isotones, the proton spectra appear structureless and statistical in nature. Proton branching ratios for the high-spin isomers in these isotopes, based on the intensity of ?-ray transitions in the intermediate nuclei, are (8+1-2)�10-4, ...

Beta-delayed proton decay was observed in /sup 148/Ho, /sup 150/Tm, and /sup 152/Lu for the first time. Contrary to neighboring even-Z N = 81 isotones, the proton spectra appear structureless and statistical in nature. Proton branching ratios for the high-spin isomers in these isotopes, based on the intensity of ..gamma..-ray transitions in the intermediate nuclei, are ...

The ground-state energy of infinite symmetric nuclear matter is usually described by strongly interacting nucleons obeying the Pauli exclusion principle. We can imagine a unitary transformation which groups four nonidentical nucleons (i.e., with different spin and isospin) close in coordinate space. Those nucleons, being nonidentical, do not obey the Pauli principle, thus their relative momenta ...

The very neutron deficient odd-odd nucleus {sup 172}Au was studied in reactions of 342 and 348 MeV {sup 78}Kr beams with an isotopically enriched {sup 96}Ru target. The {alpha} decays previously reported for {sup 172}Au were confirmed and the decay chain extended down to {sup 152}Tm through the discovery of a new {alpha}-decaying state in {sup 164}Re[E{sub {alpha}}=5623(10) ...

Excited states in the T{sub z}=(1)/(2) nucleus {sup 75}Rb were observed for the first time using the {sup 40}Ca({sup 40}Ca,{alpha}p) reaction at 128 MeV. Identification was achieved using events detected by the Daresbury recoil separator in coincidence with {gamma} rays detected in the 45 element EUROGAM I Ge-detector array. Threefold events were used to build a decay scheme which consists of two ...

The high-spin structure of odd-odd {sup 86}Nb was studied with the early implementation of GAMMASPHERE using 36 Compton-suppressed Ge detectors and the MICROBALL, a 95-element full-sphere charged-particle detector array. High-spin states were populated using the {sup 58}Ni({sup 32}S,3pn) reaction at 135 MeV with beams from the 88-Inch Cyclotron at Lawrence Berkeley National Laboratory. A number of ...

Charge-exchange reactions of (n, p) and (p, n) type at intermediate energies are a powerful tool for the study of nuclear matrix element in {beta}{beta} decay. The present paper reviews some of the most recent experiments in this context. Here, the (n, p) type reactions are realized through (d, {sup 2}He), where {sup 2}He refers to two protons in a singlet {sup 1}S{sub 0} state and where both of ...

Collective properties of high-spin states in odd -odd ('112,118,120)Sb, ('116-122)I, ('120,122)Cs and ('126,128)La nuclei have been investigated via several reactions: ('106)Cd(('12)C,(alpha)pn)('112)Sb, ('103)Rh (('12)C,3n)('112)Sb, ('110)Pd(('11)B,3n)('118)Sb, ('114,116)Cd(('7)Li,3n)('118,120)Sb, ('106)Cd(('12)C,pn)('116)I, ...

We present results of interacting-boson-fermion-fermion approximation (IBFFA) calculations for deformed odd-odd {sup 176}Re and {sup 178}Re. Such calculations yield accurate structural information for many different rotational band types, including highly distorted and doubly decoupled bands. Thus, they can help in interpreting experimental data, predicting spin-parity ...

High-spin states in 184Au have been populated via the 149Sm(29Si, 4ngamma) 184Au reaction at a beam energy of 140 MeV. Three- or higher-fold gamma-ray coincidences have been measured using the multidetector array of GASP. A rotational band built on the 11- oblate pih11/2-1otimesnui13/2-1 structure has been newly observed, similar to those reported in 186-194Au. This result extends the knowledge of ...

Electromagnetic properties of odd-odd transitional nuclei with A~ 100 are investigated experimentally and theoretically. Nanosecond isomers are studied in-beam by means of delayed ??-coincidences and the generalized centroid-shift method. The reactions 98Mo+30MeV 7Li and 92,94Mo+ 50 MeV 12C are utilized. Following half-lives are determined: T1/2 (547.2 keV in 102Rh) = ...

Proton emitter studies offer a sensitive probe of the wave function composition for nuclei beyond the proton drip-line. In particular, the experiments on proton radioactivities in the rare earth region are allowing us to study the evolution of proton-emitting states as a function of changing deformation, from nearly spherical (e.g.^150Lu [1] or ^145Tm [2]) to strongly deformed ...

The half life of the naturally occurring odd-odd isotope V/sup 50/ for electron capture decay to the first excited state of Ti/sup 50/ was found to exceed 8 x 10/sup 15/ years and for negatron decay to the first excited state of Cr/sup 50/ to exceed 1.2 x 1O/sup 16/ years. (auth)

Nanosecond lifetime measurements were performed in 196Au by means of the pulsed-beam technique. Using the centroid-shift method, one new lifetime has been determined and three known have been re-measured. The data for the transition probabilities are compared to the predictions of the extended supersymmetry for 196Au. The comparison reveals a partial agreement, which can be considered as a success ...

The Y/sup 89/(d,p)Y/sup 90/ reaction was studied for 15-Mev deuterons. Measurements of the energy splitting caused by the neutron-proton coupling in odd- odd Y/sup 90/ are reported. Angular distributions for 27 levels of Y/sup 90/ were obtained. (C.E.S.)

The exp 60 Cu nucleus has been studied via the exp 58 Ni( alpha , pn gamma ) reaction using different in-beam gamma spectroscopy techniques. As for the other odd-odd Cu, the gsub(9/2) shell plays an important role for the explanation of observed high-spin...

The neutron-deficient odd-odd nucleus sup 64 Ga was gamma -spectroscopically studied via the reactions sup 54 Fe( sup 12 C, pn gamma ) sup 64 Ga and sup 64 Zn(p, n gamma ) sup 64 Ga, whereby in the heavy-ion induced reaction for the first time high spin s...

This page will calculate standard measures for Rates, Risk Ratio, Odds, Odds Ratio, and Log Odds. It will also calculate the Phi coefficient of association; perform a chi-square test of association, if the sample size is not too small; and perform the Fisher exact probability test, if the sample size is not too large. For intermediate values of n, the ...

Measurements of Aitken nuclei, cloud nuclei, and ice nuclei in precipitation at the Jungfraujoch, Switzerland