An energy-independent nucleon-nucleon potential is derived from meson exchanges and the tensor force in this potential is investigated.

We use proton-nucleus reaction data at intermediate energies to test the emerging new generation of chiral nucleon-nucleon (NN) potentials. Predictions from a high-quality one-boson-exchange (OBE) force are used for comparison and evaluation. Both the chiral and OBE models fit NN phase shifts accurately, and the differences between the ...

A review is presented of the development and current status of nuclear shell-model calculations, in which the two-body effective interaction between valence nucleons is derived from the free nucleon nucleon potential. The significant progress made in this field within the last decade is emphasized, in particular as regards the ...

A practical formalism is developed for treating nucleon-nucleon scattering in momentum space. The non-adiabatic One-Pion-Exchange-Potential is used as an example.

Modern nucleon-nucleon (NN) potentials, which accurately fit the nucleon-nucleon scattering phase shifts, contain terms which break isospin symmetry. The effects of these symmetry violating terms on the bulk properties of nuclear matter are investigated. The predictions of the charge symmetry breaking (CSB) terms are compared with the ...

The authors present a new high-quality nucleon-nucleon potential with explicit charge dependence and charge asymmetry, which they designate Argonne {upsilon}{sub 18}. The model has a charge-independent part with fourteen operator components that is an updated version of the Argonne {upsilon}{sub 14} potential. Three additional ...

An approximate method of determining the central, the spin-orbit, and the tensor parts of a local nucleon-nucleon interaction from the dependence of the eigenphase shifts and the mixing parameter on the total angular momentum J is studied. With the assumption that the tensor force is zero at the origin, the wave equation is transformed into a differential equation which can ...

Ground-state properties are evaluated for the finite nucleus 4He starting from realistic nucleon�nucleon interactions within the framework of the Green's function approach. For the sake of comparison, the same calculations are performed using the Brueckner�Hartree�Fock approximation. For that purpose four high-quality modern nucleon�nucleon ...

We calculate nucleon-nucleon cross sections in the nuclear medium with unequal densities of protons and neutrons. We use the Dirac-Brueckner-Hartree-Fock approach together with realistic nucleon-nucleon potentials. We examine the effect of asymmetry in neutron and proton concentrations and find that it can be significant for scattering ...

We calculate nucleon-nucleon cross sections in the nuclear medium with unequal densities of protons and neutrons. We use the Dirac-Brueckner-Hartree-Fock approach together with realistic nucleon-nucleon potentials. We examine the effect of asymmetry in neutron and proton concentrations and find that it can be significant for scattering ...

The authors calculate properties of A = 6 system using the accurate charge-dependent nucleon-nucleon (NN) potential at fourth order of chiral perturbation theory. By application of the ab initio no-core shell model (NCSM) and a variational calculation in the harmonic oscillator basis with basis size up to 16 {h_bar}{Omega} they obtain ...

We calculate properties of the A=6 system using the accurate charge-dependent nucleon-nucleon (NN) potential at fourth order of chiral perturbation theory. By application of the ab initio no-core shell model and a variational calculation in the harmonic-oscillator basis with basis size up to 16?? we obtain the 6Li binding energy ...

In this talk I will address the feasibility and desirability of building a theory of nuclei around nucleon-nucleon potentials defined on the light front. 11 refs.

In this talk I will address the feasibility and desirability of building a theory of nuclei around instantaneous nucleon-nucleon potentials defined on the light front. 11 refs.

We present a charge-dependent one-boson-exchange nucleon-nucleon (NN) potential that fits the world proton-proton data below 350 MeV available in the year 2000 with a ?2 per datum of 1.01 for 2932 data and the corresponding neutron-proton data with ?2/datum =1.02 for 3058 data. This reproduction of the NN data is more accurate than by ...

We present the first nucleon-nucleon potential at next-to-next-to-next-to-leading order (fourth order) of chiral perturbation theory. Charge dependence is included up to next-to-leading order of the isospin-violation scheme. The accuracy for the reproduction of the nucleon-nucleon ( NN ) data below 290-MeV lab energy is comparable to the one of ...

We consider the spin-isospin-independent central part of the residual nucleon-nucleon potential in finite spherical nuclei taking into account the deformation effects of the nucleons within the surrounding nuclear environment. It is shown that inside the nucleus the short-range repulsive contribution of the potential is increased and ...

A practical formalism is developed for treating nucleonnucleon scattering in momentum space. The non-adiabatic one-pion-exchange potential is used as an example. (auth)

The real snd imaginary parts of the medium and highenergy optical potential for nucleon-nucleus scattering were calculated for an infinite nuclear medium with the help of recent phenomenological nucleon-nucleon phase shifts. For the S wave contribution, the exact solution of the equation for the nucleon- ...

Recently, precision laser spectroscopy on {sup 6}He atoms determined accurately the isotope shift between {sup 4}He and {sup 6}He and, consequently, the charge radius of {sup 6}He. A similar experiment for {sup 8}He is under way. We have performed large-scale ab initio calculations for {sup 4,6,8}He isotopes using high-precision nucleon-nucleon (NN) ...

Recently, precision laser spectroscopy on 6He atoms determined accurately the isotope shift between 4He and 6He and, consequently, the charge radius of 6He. A similar experiment for 8He is under way. We have performed large-scale ab initio calculations for 4,6,8He isotopes using high-precision nucleon-nucleon (NN) interactions within the no-core shell ...

Recently, precision laser spectroscopy on {sup 6}He atoms determined accurately the isotope shift between {sup 4}He and {sup 6}He and, consequently, the charge radius of {sup 6}He. A similar experiment for {sup 8}He is under way. We have performed large-scale ab initio calculations for {sup 4,6,8}He isotopes using high-precision nucleon-nucleon (NN) ...

The role of the off-shell dependence of {rho}-{omega} mixing in the charge symmetry breaking nucleon-nucleon potential is discussed. It is shown that models describing the off-shell dependence of {rho}-{omega} mixing are not sufficient to determine the charge symmetry breaking nucleon-nucleon potential.

BS>The real and imaginary part of the medium and high energy potential for nucleon-nucleus scattering is calculated for an infinite nuclear medium, using phenomenological nucleon-nucleon phase shifts. For the S wave contribution, the exact solution of the equation for the nucleon-nucleon scattering is used for the separable ...

The pi d-scattering length is calculated using the formalism of Faddeev's integral equations. Nucleon- nucleon and pion- nucleon interactions are described by a potential with separable variables in the S-state. The dependence of the pi d-scattering length on the shape of the attractive nucleon- ...

A technique of approximating expectation values of realistic nuclear Hamiltonian with the antisymmetrised molecular dynamics wave function is investigated. A phenomenological and a semi-realistic nucleon-nucleon potentials are used. Some of the ground-state properties of selected few-nucleon systems are calculated. The results are compared with ...

We present an accurate nucleon-nucleon (NN) potential based upon chiral effective Lagrangians. The model includes one- and two-pion exchange contributions up to chiral order three and contact terms (which represent the short range force) up to order four. Within this framework, the NN phase shifts below 300 MeV lab. energy and the ...

The generation of accurate scaling of mutiplicity distributions is presented. The distributions of (pi)(sup -) mesons (negative particles) and (pi)(sup +) mesons in different nucleon-nucleon interactions (PP, NP and NN) are described by the same universal...

Starting from a realistic nucleon-nucleon interaction (Reid soft-core) in the model of two infinitely extended confusing nuclear matter complex energy densities are calculated by means of a G matrix. By means of a generalized local-density approximation t...

A review is given of the use of nucleon--nucleon effective interactions, or G-matrices, derived from realistic nucleon--nucleon forces and applied to the scattering of both light and heavy ions. Particular attention is paid to the usefulness of simple representations of these interactions. It is shown that they are remarkably successful in describing the data for both elastic ...

Microscopic calculations based on realistic nuclear Hamiltonians, while yielding accurate results for the energies of the ground and low-lying excited states of nuclei with A?12, fail to reproduce the empirical equilibrium properties of nuclear matter, that are known to be significantly affected by three-nucleon forces. We discuss a scheme suitable to construct a ...

Results of nuclear-matter calculations are presented for several nucleon-nucleon potentials that fit scattering data and deuteron properties. The results suggest that two-body potentials cannot account quantitatively for nuclear saturation.

Nuclear molecular dynamics approach with several sets of the effective nucleon-nucleon potentials is used in order to construct dynamical nucleus-nucleus potentials. The method is illustrated on the case of the /sup 40/Ca+/sup 40/Ca system. The resulting ...

Accurate quantum Monte Carlo calculations of ground and low-lying excited states of light p-shell nuclei have been made for realistic nuclear forces. These include two-nucleon potentials that reproduce nucleon-nucleon scattering data and meson-exchange three-nucleon potentials constrained to reproduce the binding ...

The relativistic distorted-wave impulse approximation is used to describe the 3He( e, e' p)2H process. We describe the 3He nucleus within the adiabatic hyperspherical expansion method with realistic nucleon-nucleon interactions. The overlap between the 3He and the deuteron wave functions can be accurately computed from a three-body calculation. The ...

The Wolfenstein parameters are for the first time obtained analytically in terms of observables. It is shown that a set of ten nucleon-nucleon (NN) observables, which contains polarization observables together with the differential cross section, determines uniquely the solution for Wolfenstein parameters except for a common insignificant phase. Using such analytical solutions ...

We study ground-state properties of the doubly magic nuclei {sup 4}He, {sup 16}O, and {sup 40}Ca employing the Goldstone expansion and using as input four different high-quality nucleon-nucleon (NN) potentials. The short-range repulsion of these potentials is renormalized by constructing a smooth low-momentum ...

A relativistic microscopic model of nuclear collisions is suggested that takes into account nucleon-nucleon potentials and reflects the main processes occurring during collisions: motion of relativistic nuclei before collision, the formation of composite ...

A comparison is made between matrix elements calculated using the uncoupled channel Sussex approach to second order in DWBA and matrix elements calculated using a square well potential. The square well potential illustrated the problem of the determining ...

The 500 MeV effective nucleon-nucleon isoscalar interaction is investigated through nonrelativistic folding model analyses of p+nucleus elastic scattering data. Three empirical interactions are deduced. The first, obtained from a relativistic-Schroedinger-equation-equivalent form of a phenomenological Dirac optical potential, contains terms which are ...

The spin-dependent neutron-proton total cross-section differences ??L and ??T have been measured between En=5 and 20 MeV in longitudinal and transverse nucleon spin orientations. From these data the 3S1-3D1 mixing parameter ?1, which characterizes the nucleon-nucleon tensor force at low and intermediate energies, was determined in a model-insensitive way. In combination with measurements at higher ...

The Broyden-Fletcher-Goldhaber-Shanno (BFGS) quasi-Newtonian scheme is known as the most efficient scheme for variational calculations of energies. This scheme is actually a member of a one-parameter family of variational methods, known as the Broyden ? -family. In some applications to light nuclei using microscopically derived effective Hamiltonians starting from accurate ...

A short-range nonlocal nucleon-nucleon potential, which previously provided a better description for the three-nucleon bound states {sup 3}H and {sup 3}He then the local-potential models, is tested in p-d scattering calculations at energies below the three-body breakup threshold. This potential again provides an ...

A comparison is made between matrix elements calculated using the uncoupled channel Sussex approach to second order in DWBA and matrix elements calculated using a square well potential. The square well potential illustrated the problem of the determining parameter independence balanced with the concept of phase shift difference. The supersoft core ...

In our recent works we derived a chiral O(q4) two-pion exchange nucleon-nucleon potential (TPEP) formulated in a relativistic baryon (RB) framework, expressed in terms of the so called low energy constants (LECs) and functions representing covariant loop integrations. In order to facilitate the use of the potential in nuclear ...

The spatial structure of pairing correlations in {sup 120}Sn is investigated making use of both the bare nucleon-nucleon potential and the interaction induced by the exchange of collective vibrations, taking into account self-energy effects. The resulting pairing gap is strongly peaked on the nuclear surface.

The spatial structure of pairing correlations in 120Sn is investigated making use of both the bare nucleon-nucleon potential and the interaction induced by the exchange of collective vibrations, taking into account self-energy effects. The resulting pairing gap is strongly peaked on the nuclear surface.

The resonating-group method is used to study the alpha + exp 15 N system. The result shows that, with the use of a reasonable nucleon-nucleon interaction and a phenomenological imaginary potential, the calculation can yield a differential cross section th...

The parity-nonconserving-nuclear force is discussed in the process n + p implies d + gamma . Formulae for the circular polarization (P sub( gamma )) and the asymmetry ( alpha ) of the emitted gamma rays are given for various nucleon-nucleon potentials. De...

The change in the heavy-ion interaction energy induced by neglecting the antisymmetrization between projectile and target was studied. The sign of the energy shift and its sensitivity to the strength, range and exchange terms of the nucleon--nucleon interaction were discussed.

Nucleon-nucleon potentials obtained by the method of composite quark bags are used for calculation of the binding energy and wave function in the four-nucleon system. The calculations are based on solution of integral equations for the wave function of th...

The elastic and inelastic scattering of intermediate energy (less than or equal to 1 GeV) protons by nuclei is considered first. The discussion focuses on the determination of the proton-nucleus optical potential in terms of the elementary nucleon-nucleon...

We compare angular distributions calculated by folding nucleon- nucleon scattering kernels, using the theory of Feshbach, Kerman and Koonin, and the systematics of Kalbach, with a wide range of data. The data range from (n,xn) at 14 MeV incident energy to (p,xn) at 160 MeV incident energy. The FKK theory works well with one adjustable parameter, the depth ...

Comparing with intermediate-energy data for (p-->,p-->') spin-flip transitions, such as the one to the 6-, T=1 state in 28Si, we examine distorted-wave impulse-approximation predictions based on effective interactions derived from modern, high-precision nucleon-nucleon potentials. This establishes a reliable point of reference from which we explore ...

The Efimov effect in the S wave spin doublet trinucleon system is studied and the virtual state of this system is found to be an Efimov virtual state. In the Efimov limit this state becomes a bound state. But as the strength of the spin triplet nucleon-nucleon interaction is increased, it first moves away from the lowest physical scattering threshold, then stops and turns ...

In the calculations of the many-nucleon bound states, using the realistic nucleon-nucleon potential, and a three- and four-nucleon potential, the Exact Many-Body Nuclear Cluster Model (EMBNCM) was found to give accurate results, that converege much more rapidly, than those obtained by the Faddeev equation ...

In the calculations of the many-nucleon bound states, using the realistic nucleon-nucleon potential, and a three- and four-nucleon potential, the Exact Many-Body Nuclear Cluster Model (EMBNCM) was found to give accurate results, that converege much more rapidly, than those obtained by the Faddeev equation ...

Nonrelativistic full-folding optical model potentials for nucleon elastic scattering have been calculated and applied to proton scattering on {sup 16}O and {sup 40}Ca at energies between 135 and 500 MeV. The optical potentials were calculated in momentum space by folding the mixed target density with the off-energy-shell free {ital t} matrix derived from ...

The recent, very accurate proton-proton analyzing-power measurements by the Z�rich group at tlab = 50.04 MeV are analyzed. We show that in order to arrive at a proper description of these data, the magnetic-moment interaction has to be included in all partial waves. It is also shown that some of the approximations made in the literature, when trying to incorporate this ...

The binding energy of nuclear matter has been determined with a most up-to-date nucleon-nucleon potential by solving the reaction matrix equation of the Brueckner theory self-consistently in momentum space. The potential has Gaussian soft cores, joins the OPEP at large distances and reproduces two-nucleon scattering data quite ...

We have calculated the ground-state energy of the doubly-magic nucleus {sup 40}Ca within the framework of the Goldstone expansion using the CD-Bonn nucleon-nucleon potential. The short-range repulsion of this potential has been renormalized by integrating out its high-momentum components so as to derive a low-momentum ...

Nucleon-nucleon interactions are at the heart of nuclear physics, bridging the gap between QCD and the effective interactions appropriate for the shell model. We discuss the current status of {ital NN} data sets, partial-wave analyses, and some of the issues that go into the construction of potential models. Our remarks are illustrated by reference to the ...

In this contribution, we present a simple approach to the scattering problem using the technique for discrete states, particularly developed for a basis expansion method. An idea is very simple and the following: First, we calculate a spectroscopic amplitude (SA) between two subsystems from the �discretized� wave function obtained in the bound-state calculation. When one uses square-integrable ...

Significant progress has been made over the past several years in developing energy-and density-dependent effective interactions and optical potentials based on free nucleon-nucleon potentials. This leads to the hope that the nucleon-scattering reaction mechanism may be well enough to probe details of nuclear spectroscopy (i.e., ...

Two-nucleon momentum distributions are calculated for the ground states of nuclei with mass number A {le} 8, using accurate variational Monte Carlo wave functions derived from a realistic Hamiltonian with two- and three-nucleon potentials. The momentum distribution of 'np' pairs is found to be much larger than that of ...

The energy density functional derived from the Negele effective interaction has been used to calculate the real part of the ion-ion interaction potential between several pairs of spherical nuclei in the framework of Brueckner's sudden approximation. We have found that the Negele realistic interaction produces a deeper ion-ion potential and shifts ...

An approach related to the teaching of the chapter on bound and scattering states in a short-range potential, which forms a standard part of quantum-mechanics course, is outlined with an example. The proposed interaction closely approximates the realistic Yukawa potential. It also represents the Coulomb potential in a limiting case. ...

In calculating the fourth order S matrix for the elastic scattering of two nucleons in a nonlocal strong interaction scheme, in each case). -N, a nuclear potential is obtained that is the sum of a central potential, of a tensor potential, and of potentials depending on spin-orbit, quadratic spin-orbit, and ...

An investigation was made of a static soft-core potential (the Morse potential) and three representative velocity-dependent N-N potentials. First the problem of adjusting potentials to maintain the 1S state bound near zero energy is studied, and two integ...

The sensitivity of proton-nucleus elastic scattering to different nucleon-nucleon effective interactions is studied within the framework of the nonrelativistic full-folding model. Calculations of the nucleon-nucleus optical potential are made using the free nucleon-nucleon {ital t}-matrices generated from the Bonn, Paris, ...

The present work is an extension of a previous study of the nucleon-nucleon interaction based on the chromodielectric soliton model. The former approach was static, leading to an adiabatic potential. Here we perform a dynamical study in the framework of the generator coordinate method. In practice we derive an approximate Hill-Wheeler differential equation and obtain a local ...

We argue that the minimal chiral background for the two-pion exchange nucleon-nucleon interaction has nowadays a rather firm conceptual basis, which entitles it to become a standard ingredient of any modern potential. In order to facilitate applications, we present a parametrized version of a configuration space potential derived ...

We present new accurate measurements of the differential cross section ?(?) and the proton analyzing power Ay for proton-He3 elastic scattering at various energies. A supersonic gas-jet target has been employed to obtain these low-energy cross-section measurements. The ?(?) distributions have been measured at Ep=0.99, 1.59, 2.24, 3.11, and 4.02 MeV. Full angular distributions ...

We present new accurate measurements of the differential cross section ?(?) and the proton analyzing power Ay for proton--^3He elastic scattering at various energies. The ?(?) distributions have been measured at Ep = 0.99, 1.59, 2.24, 3.11, and 4.02 MeV. Full angular distributions of Ay(?) have been measured at Ep = 1.60, 2.25, 3.13, and 4.05 MeV. This set of high-precision ...

The spin-dependent neutron-proton total cross-section differences {Delta}{sigma}{sub L} and {Delta}{sigma}{sub T} have been measured between E{sub n}=5 and 20 MeV in longitudinal and transverse nucleon spin orientations. From these data the {sup 3}S{sub 1}-{sup 3}D{sub 1} mixing parameter {epsilon}{sub 1}, which characterizes the nucleon-nucleon tensor force at low and intermediate energies, was ...

An important breakthrough recently achieved by a group of theoreticians at Pisa makes it now possible to compare the wealth of accurate proton-deuteron scattering data at energies below E{sub p}=3.3MeV to three-nucleon calculations that include, for the first time, the Coulomb interaction in a rigorous way. Previous comparisons of theoretical predictions and experimental data ...

As a consequence of a weak nucleon-nucleon interaction parity admixtures in nuclear states give rise to a small forward-backward asymmetry of gamma -quanta with respect to the direction of beta -particle emission. A highly accurate arrangement using four ...

The nuclear shell model with a second-order effective Hamiltonian derived within Brueckner theory from the free nucleon-nucleon interaction is shown to yield accurate binding energies of nuclei with 16 < A < 40. This agreement is obtained by choosing the spectrum of low-lying unoccupied orbitals in a justified manner and, when necessary, by employing ...

We have studied neutron-rich carbon isotopes in terms of the shell model employing a realistic effective Hamiltonian derived from the chiral N{sup 3}LOW nucleon-nucleon potential. The single-particle energies and effective two-body interaction have both been determined within the framework of the time-dependent degenerate linked-diagram perturbation ...

The mean free paths and in-medium scattering cross sections of energetic nucleons in neutron-rich nucleonic matter are investigated using the nucleon optical potential obtained within the relativistic impulse approximation with the empirical nucleon-nucleon scattering amplitudes and the nuclear densities obtained in the relativistic mean-field model. It is ...

A new computational method for solving the nucleon-deuteron breakup scattering problem has been applied to study the elastic nucleon-deuteron scattering on the basis of the configuration-space Faddeev-Noyes-Noble-Merkuriev equations. The Merkuriev-Gignoux-Laverne approach has been generalized for arbitrary nucleon-nucleon potentials and with an arbitrary ...

The nucleon-nucleon interaction is described over the laboratory scattering energy range O-350 MeV by a potential used in conjunction with the Schrodinger equation. In momentum space the potential is a superposition of Born terms obtained from single exch...

The outer region of the NN interactions is dominated by the one pion exchange potential (OPEP), followed by the two-pion exchange potential (TPEP). Chiral calculations of the TPEP have been performed using either heavy baryon1 (HB) or relativistic2 perturbation theories. We compare the predictions from these two approaches for the dominant central ...

The energy dependence of the real part of the ion-ion interaction potential is studied using an energy density functional derived from the Negele realistic nucleon-nucleon interaction. It is found that the Negele force produces an ion-ion potential which varies slowly with energy compared to that derived using a simple two-body ...

The calculation of transport properties of Fermi liquids, based on the formalism developed by Abrikosov and Khalatnikov, requires the knowledge of the probability of collisions between quasiparticles in the vicinity of the Fermi surface. We have carried out a study of the shear viscosity of pure neutron matter, whose value plays a pivotal role in determining the stability of rotating neutron ...

S>The course presented at the Summer School of Theoretical physics on problems associated with nucleons and antinucleons is reproduced. The topics discussed in the section by Levy are antinucleon phenomena, nucleon-nucleon potentials, nucleon-nucleon scattering studied by a method proceeding from the Mandelstam theory, and ...

Within a transport model we search for potential probes of the isospin dependence of the in-medium nucleon-nucleon (NN ) cross sections. Traditional measures of the nuclear stopping power are found to be sensitive to the magnitude but they are ambiguous for determining the isospin dependence of the in-medium NN cross sections. It is shown that isospin ...

We outline the progress made in the past five years by the Sao Paulo group in the development of a two-pion exchange nucleon-nucleon potential within a Lorentz-invariant framework of (baryon) chiral perturbation theory.

We evaluate the two pion exchange contribution to the nucleon-nucleon potential in configuration space using a minimal chiral model containing only pions and nucleons. The scalar-isoscalar component of the interaction is relatively small, due to cancellations between large terms, and fails to reproduce the intermediate range attraction in the central channel. We show that ...

for photodisintegration of 3N bound states are shown. Keywords: nucleon�nucleon potential, three�nucleon force, elastic of rigorous 3N bound and scattering states we discuss next the photodisintegration of 3N bound states, respectively. The calculations are based on the CD Bonn potential. THE PHOTODISINTEGRATION OF 3N BOUND STATES

An iteration procedure is ciscussed for the integral equation relating the t matrix for two nucleons in the medium to the free nucleon-nucleon t matrix. The real and imaginary pants of the medium- and high-energy optical-model potential are discussed from the point of view of this procedure. Numerical results are obtained for the Gammel-Thaler ...

A central nucleon-nucleon force, consisting of two Gaussian potentials with general exchange mixtures, is adapted to the realistic matrix elements of Golanska, Faessler and Appel. The resulting effective interaction is disscused and tested in a projected Hartree-Fock calculation for $sup 8$Be. (orig.)

The nucleon-nucleon and hyperon-nucleon interactions are studied by the one-boson-exchange(OBE) potential with the vertex form factor. To make our theory as relativistic as possible, we calculate the OBE-potential in the momentum space and use the Blankenbecler-Sugar equation. We also treat the singularity in the multichannel Blankenbecler-Sugar equation. ...

A recently proposed set of nonlocal separable potentials in infinite nuclear matter is examined. The saturation properties of these potentials are investigated by calculating the binding energy per particle, saturation density, compressibility modulus, and defect parameter for nuclear matter. For this purpose, the Brueckner theory is used to ...

Relativistic and nonrelativistic modern nucleon-nucleon potentials are mapped on a relativistic operator basis using projection techniques. This allows us to compare the various potentials at the level of covariant amplitudes were a remarkable agreement is found. In nuclear matter large scalar and vector mean fields of several hundred ...

The temperature and density dependence of the meson-nucleon vertex form factors is studied in the framework of thermofield dynamics. Results are obtained for two rather different nucleon-nucleon potentials: the usual Bonn potential and the variation with a softer ?NN form factor, due to Holinde and Thomas. In general, the results ...

For near-magnetic nuclei, the matrix elements of the central exchange nucleon-nucleon interaction potential energy operator between the generating functions of the total basis of the Sn are obtained. The basis states are highest weigt vectorsp(2,R) irredu...

The process of exclusive deuteron electrodisintegration is considered within the point form of relativistic quantum mechanics. Relevant calculations are performed on the basis of the Nijmegen and Moscow nucleon-nucleon potentials, the latter involving forbidden states. Final-state interaction is taken into account. For either type of the ...

We examine the theoretical mechanisms for producing high-energy photons in the reaction ..cap alpha..+ /sup 154/Sm and /sup 3/He+/sup 148/Sm at low bombarding energies. We find that neither potential field nor nucleon-nucleon collisions can account for the measured high-energy tail, leaving the source of these photons a mystery. Further experiments are ...

We performed a self-consistent calculation of the nuclear matter properties within the Green's function scheme. Essential is the self-energy sigma (p;epsilon) (effective single-particle potential or mass operator), which determines the properties of the s...

A simple effective nucleon-nucleon interaction for shell model calculations in the sd-shell is derived from the Reid soft-core potential folded with two- body correlation functions which take account of the strong short-range repulsion and large tensor co...

The Bethe-Salpeter equation is solved in closed form with the help of a four dimensional separable 'potential'. For possible applications to three-nucleon investigations the authors have fitted all nucleon-nucleon S-wave phase shifts in a sufficient way b...

We consider the interaction of two Skyrmions in the framework of the sudden approximation. The widely used product Ansatz is investigated. Its failure in reproducing an attractive central potential is associated with terms that violate G parity. We discuss the construction of alternative Ans�tze and identify a plausible solution to the problem.

The rates of axion emissions by nucleon-nucleon bremsstrahlung from neutron stars obtained with the inclusion of the full angular momentum contribution from a nuclear one-pion-exchange potential (OPEP), are studied in different conditions of temperature and degeneracy in both, non degenerate (ND) and degenerate (D) regimes. The comparison with the previous results obtained in ...

We explore neutron skin predictions for {sup 208}Pb in relation to the symmetry pressure in various microscopic models based on realistic nucleon-nucleon potentials and either the Dirac-Brueckner-Hartree-Fock approach or the conventional Brueckner-Hartree-Fock framework implemented with three-body forces. We also discuss the correlation between the neutron ...

In this work we focus on the possibility of extract low energy constants via fits from phase shifts of nucleon-nucleon scattering, pointing out the differences between the relativistic and heavy baryon formulations of chiral perturbation theory. Preliminary results indicate that these two formulations give slightly different predictions for phase shifts, affecting the extraction of the low energy ...

The Hartree-Fock-Bogoliubov cranking equations are solved for $sup 168$Yb and $sup 170$Yb with an effective interaction obtained from the Reid soft- core nucleon-nucleon potential. Coriolis antipairing in $sup 168$Yb and pair realignment in $sup 170$Yb explain their anomalous high-spin spectra.

Calculations of the enhancement factor kappa in the electric dipole sum done by the use of solutions of the Brueckner-Hartree-- Fock (BHF) equations are presented. Results are given for /sup 4/He, /sup 12/C and /sup 16/O for various realistic nucleon- nucleon potentials. (auth)

We find the effect of the observed charge-independence-breaking in {sup 1}S{sub 0} nucleon-nucleon scattering on the binding energy of the triton to be of order 80 keV. When corrections for this effect are made in an 18-channel momentum-space Faddeev calculation, we find the Paris and Argonne v{sub 14} potentials triton binding energies that differ by only ...

The ab initio no-core shell model (NCSM) is extended to include a realistic three-body interaction in calculations for p-shell nuclei. They present results of first applications using the Argonne V8' nucleon-nucleon (NN) potential and the Tucson-Melbourne...

Effective alpha - alpha potential is investigated from the standpoint of the cluster model using reliable properties of the pion-theoretical nucleon- nucleon potentials. The main features of alpha - alpha potential (outside attraction, inside repulsion, and angular momentum ...

A two-pion-exchange nuclear potential is calculated using the dispersion theory construction. The field-theoretic nucleon-nucleon amplitude has the full two-pion contribution. The description allows for the inclusion of information on the elementary processes, ?N-->?N and NN-->??. The potential is constructed by removing from the ...

The physical significance of nucleon-nucleon potentials depends on their relation to the two-nucleon mass operator. These relations are examined for phenomenological potentials. Momentum space Bethe-Salpeter amplitudes with one particle on the mass shell approximate half-off-shell T matrices defined in the framework of the Haag-Ruelle theory. This implies ...

The residual interaction responsible for the occurrence of certain closely spaced doublets in nuclei with a p/sub 1/2/, nucleon coupled to a core of spin j is sought to be represented by an effective nucleon-nucleon potential. After justifying the dropping of the hard core and the noncentral terms, the two- body potential is ...

We present a multienergy partial-wave analysis of all NN scattering data below Tlab=350 MeV, published in a regular physics journal between 1955 and 1992. After careful examination, our final database consists of 1787 pp and 2514 np scattering data. Our fit to these data results in ?2/Ndf=1.08, with Ndf=3945 the total number of degrees of freedom. All phase shifts and mixing parameters can be ...

Calculations for /sup 7/Li elastic scattering at 88 MeV have been made explicitly including a quadrupole term in the optical potential resulting from folding of an effective nucleon-nucleon interaction with the quadrupole deformation of /sup 7/Li. Data for /sup 48/Ca could be fitted without a renormalization of the folded potential, ...

In the present work, we test the validity of replacing the nondiagonal matrix {rho}({ital {rvec r}}, {ital {rvec r}}{prime}) appearing in the exchange part of the {alpha}-nucleus optical potential by an approximation based on the density matrix expansion (DME) used frequently in nuclear structure calculations. We have found that for the recently derived BDM3Y ...

By the quenched lattice QCD simulation for two nucleons with finite scattering energy, validity of the derivative expansion of the general nucleon-nucleon potential U({r},{r}') = V({r}, {nabla}_{{r}}) ?^3({r}-{r}') is studied. The relative kinetic energy between two nucleons is introduced through the anti-periodic boundary condition in the spatial ...

We study the properties of hypernuclei containing one ? hyperon in the framework of the correlated basis function theory with Jastrow correlations. Fermi hypernetted chain integral equations are derived and used to evaluate energies and one-body densities of ? hypernuclei having a doubly closed shell nucleonic core in the jj coupling scheme, from carbon to lead. We also study hypernuclei having ...

We discuss peculiarities of open-quantum systems, as compared to closed-quantum systems. We emphasize the importance of taking continuum degrees of freedom into account when dealing with systems with a tendency to decay through emission of fragments. In this context, we introduce the coupled-cluster theory and argue that this method allows for an accurate description of such ...

We compare a proximity-type potential for two interacting nuclei with the double-folding method. Both spherical and deformed systems are considered. Special ''orientation windows'' are found for two deformed nuclei giving rise to nuclear cohesion. If the same nucleon-nucleon interaction is utilized, the proximity and the ...

We have studied neutron-rich calcium isotopes in terms of the shell model, employing a realistic effective interaction derived from the CD-Bonn nucleon-nucleon potential. The short-range repulsion of the potential is renormalized by way of the V{sub low-k} approach. The calculated results are in very good agreement with the available ...

We have studied neutron-rich calcium isotopes in terms of the shell model, employing a realistic effective interaction derived from the CD-Bonn nucleon-nucleon potential. The short-range repulsion of the potential is renormalized by way of the Vlow-k approach. The calculated results are in very good agreement with the available ...

We construct a complex energy functional to be used in the calculation of the nucleus-nucleus optical potential. The functional is related to a Skyrme-type nucleon-nucleon interaction derived from a finite range complex interaction previously obtained from nuclear matter calculation appropriate to heavy ion collisions. Calculations for /sup 16/O+/sup 16/O ...

The discrete energy eigenvalues of two nucleons interacting with a finite-range nuclear force and confined to a harmonic potential are used to numerically reconstruct the free-space scattering phase shifts. The extracted phase shifts are compared to those obtained from the exact continuum scattering solution and agree within the uncertainties of the calculations. Our results ...

The cross section for the elastic scattering of {alpha} particles from {sup 11}Li at {ital E}{sub lab}=26 MeV/nucleon is calculated. The single-folding potential plus second-order rescattering correction is used as an optical potential. It is found that the angular distribution is farside dominated. The second-order correction, which contains the ...

A major goal in nuclear physics is to understand how nuclear structure comes about from the underlying interactions between nucleons. This requires modelling nuclei as collections of strongly interacting particles. Using realistic nucleon-nucleon potentials, supplemented with consistent three-nucleon potentials and two-body electroweak ...

A major goal in nuclear physics is to understand how nuclear structure comes about from the underlying interactions between nucleons. This requires modelling nuclei as collections of strongly interacting particles. Using realistic nucleon-nucleon potentials, supplemented with consistent three-nucleon potentials and two-body electroweak ...

A major goal in nuclear physics is to understand how nuclear structure comes about from the underlying interactions between nucleons. This requires modelling nuclei as collections of strongly interacting particles. Using realistic nucleon-nucleon potentials, supplemented with consistent three-nucleon potentials and two-body electroweak ...

A major goal in nuclear physics is to understand how nuclear structure comes about from the underlying interactions between nucleons. This requires modelling nuclei as collections of strongly interacting particles. Using realistic nucleon-nucleon potentials, supplemented with consistent three-nucleon potentials and two-body electroweak ...

The full folding optical potential for the elastic scattering of protons from {sup 16}O and {sup 40}Ca at 200 MeV is calculated. The fully off-shell free nucleon-nucleon {ital t} matrix, at a fixed energy, derived from the Paris potential and harmonic oscillator nuclear single-particle wave functions are used for both systems. The ...

In this work correlated basis functions theory is applied at the lowest order to analyze the ground state and low energy spectrum of light (p-shell) nuclei. The study is an extension of a previous work devoted to the 16O nucleus and includes state-dependent correlations, whose radial components are determined by solving a set of Euler-Lagrange equations. The matrix elements are computed by using a ...

Fusion cross sections for /sup 16/O+ /sup 16/O and /sup 40/Ca+ /sup 40/Ca reactions are calculated in the classical microscopic equations of motion approach. Calculated fusion cross sections are sensitive to the long-range nature of the effective nucleon-nucleon (NN) potential. It is shown that with a proper choice of the parameters of the NN ...

We calculate the proton-proton densities of {sup 3}He and {sup 4}He using ground-state wave functions obtained from the Faddeev and Faddeev-Yakubovsky methods, respectively. The experimental {sup 3}He proton-proton momentum space density is extracted from the electric-charge form-factor data and the longitudinal Coulomb sum rule. We use this as a testing ground for coordinate space Faddeev wave ...

In this contribution, we report for a theoretical study of the longitudinal asymmetry induced by parity-violating (PV) nucleon-nucleon potential in the charge-exchange reaction ^3He(n,p)^3H. Such an experiment is in an advanced stage of planning at the Spallation Neutron Source at Oak Ridge National Laboratory. The matrix elements involving PV transitions ...

Pion-meson-exchange nucleon-nucleon potentials are derived for two nucleons in the intermediate states. The mesons we include are (i) pseudoscalar mesons {pi},{eta}, and {eta}{sup {prime}}, (ii) vector mesons {rho}, {omega}, and {phi}, (iii) scalar mesons {ital a}{sub 0}(980), {var_epsilon}(760), and {ital f}{sub 0}(975), and (iv) the {ital J}=0 ...

Short-range pseudopotentials are required to be added to the realistic nucleon-nucleon interactions to achieve healing in the correlated wave functions in such a way as to produce zero-phase shift. The introduction of pseudopotentials leads to an effective interaction and an effective Hamiltonian. The differential cross sections for the two direct stripping nuclear reactions ...

6,7Li-nucleus double-folding optical potentials have been constructed using the JLM and a gaussian shape of the effective nucleon-nucleon interaction. Angular distributions of the differential cross sections of 6,7Li elastic scattering from 12C, 28Si, 40Ca, 58Ni, 90Zr and 208Pb targets at 12.5-53 MeV//u were analyzed using the derived ...

Relations between parameters of the nucleon-nucleon triplet-even potentials consistent with the n-p data are investigated. Strength of the triplet-even spin-orbit potential cannot be determined without close reference to the strength of a triplet-even quadratic spin-orbit potential. For a strong quadratic spin-orbit ...

We analyze the spin-orbit coupling term in the nuclear energy density functional in terms of a zero-range NN-contact interaction and finite-range contributions from two-pion exchange. We show that the strength of the spin-orbit contact interaction as extracted from high-precision nucleon-nucleon potentials is in perfect agreement with that of ...

We analyze the spin-orbit coupling term in the nuclear energy density functional in terms of a zero-range NN-contact interaction and finite-range contributions from two-pion exchange. We show that the strength of the spin-orbit contact interaction as extracted from high-precision nucleon-nucleon potentials is in perfect agreement with that of ...

A relativistic energy density functional is constructed to investigate the Dirac effects on different properties of the structure and scattering of finite nuclei. The kinetic energy density has been derived within a relativistic extended Thomas-Fermi model and includes gradient corrections to second order in [h bar]. The effective mass and the volume term of the potential ...

We calculate in chiral perturbation theory the parity-violating two-pion exchange nucleon-nucleon potentials at leading one-loop order. At a distance of r=m{sub {pi}}{sup -1}{approx_equal}1.4 fm they amount to about {+-}16% of the parity-violating 1{pi} exchange potential. We evaluate also the parity-violating effects arising from ...

We present a novel scheme for nuclear structure calculations based on realistic nucleon-nucleon potentials. The essential ingredient is the explicit treatment of the dominant interaction-induced correlations by means of the unitary correlation operator method (UCOM). Short-range central and tensor correlations are imprinted into simple, uncorrelated ...

We present a novel scheme for nuclear structure calculations based on realistic nucleon-nucleon potentials. The essential ingredient is the explicit treatment of the dominant interaction-induced correlations by means of the Unitary Correlation Operator Method (UCOM). Short-range central and tensor correlations are imprinted into simple, uncorrelated ...

Nucleon-nucleon scattering in spin-triplet channels is analyzed within an effective field theory where one-pion exchange is treated nonperturbatively. Justifying this requires the identification of an additional low-energy scale in the strength of that potential. Short-range interactions are organized according to the resulting power counting, in which the ...

Free nucleon-nucleon irteractions are used to compute level structures of light nuclei. The basic idea involves the observation that the two-particle harmonic oscillator Hamiltonian, containing a general interaction term, can be separated into center-of-mass and relative terms and, therefore, solved exactly. However, the presence of other particles makes such a ...

We present the first study to examine the validity of the relativistic impulse approximation (RIA) for describing elastic proton-nucleus scattering at incident laboratory kinetic energies lower than 200 MeV. For simplicity we choose a Pb208 target, which is a spin-saturated spherical nucleus for which reliable nuclear structure models exist. Microscopic scalar and vector optical ...

model for the nucleon-nucleon interaction have been performed to ascertain the validity of various approximations made by those authors. Their approximations include locality, a prescription for removimg explicit energy dependence, and further numerical approximations. The separate effects of energy dependence and nonlocality appear to be significant even at relatively long ranges and ...

The many-body Schroedinger equation with a semirealistic nucleon-nucleon interaction potential including the Coulomb repulsion of the protons is used with the longitudinal oscillations of the inertia ellipsoid as basis functions to investigate the spectra and other characteristics of collective excitations in /sup 18/O and /sup 18/Ne. The calculations ...

The matrix elements of the potential-energy operator of the central exchange nucleon-nucleon interaction between the generating functions of the complete basis of an irreducible representation of Sp(2, R) are obtained for near-magic nuclei. The basis states are the highest vectors of the irreducible representations of SU(3) and have definite O(A--1) ...

A method for solving Faddeev equations in configuration space for a bound state and a continuous spectrum of the system of three nucleons was developed on the basis of expansions in K harmonics. Coulomb interaction and particle spins were not taken into account in this study. The method in question was used to describe the triton bound state and differential cross sections for neutron-deuteron ...

Two-particle processes in a four-nucleon system are investigated within the framework of the multichannel K-matrix formalism. The K-matrix elements are approximated by the amplitudes of Feynman diagrams corresponding to the mechanisms of one- and two-nucleon exchange. These amplitudes are calculated by using the /sup 3/H (or /sup 3/He) wave functions obtained by solving the Faddeev equations for ...

Comprehensive investigations of the observed cluster radioactivity are carried out. First, the relativistic mean field (RMF) theory is employed for the calculations of the ground-state properties of relevant nuclei. The calculations reproduce the experiment well. The calculated RMF point densities are folded with the density-dependent M3Y nucleon-nucleon interaction to obtain ...

The structure of the N = 50 isotones 98Cd, 97Ag and 96Pd is studied in terms of a shell model employing a realistic effective interaction derived from the Bonn-A nucleon-nucleon potential. The single-hole energies are fixed by resorting to an analysis of the low-energy spectra of the isotones with A?89. Comparison shows that our results are in very ...

A simple relationship between the one-body and exchange current contributions to the axial charge operator may allow a separation of these amplitudes in the b-decay transition /sup 18/Ne(0/sup +/1)..-->../sup 18/F(0/sup -/0). Since the exchange current operator is related by isospin rotation to the pion exchange component of the parity nonconserving (PNC) nucleon-nucleon ...

We provide a microscopic calculation of neutron-proton and neutron-neutron cross sections in symmetric nuclear matter at various densities, using the Brueckner-Hartree-Fock approximation scheme with the Paris potential. We investigate separately the medium effects on the effective mass and on the scattering amplitude. We determine average cross sections suitable for ...

In 1956, the one-pion-exchange potential (OPEP) at large internucleon distances was established and this first success in substantial understanding of nuclear forces has become the keystone in studying nuclear forces since then. As was reported in the review article in 1956, this success was obtained by our Japanese group following the Taketani theory, which proposes to ...

In the low-energy regime, differential cross sections for n + d elastic scattering are not well described in existing nuclear data libraries, such as ENDF/B-VII.0. Supporting experimental data in this energy region are old, sparse and often inconsistent. We have carried out calculations with the AGS three-body theory and the Bonn-B nucleon-nucleon ...

Microsecond isomers in the In and Cd isotopes, in the mass range A = 123 to 130, were investigated at the ILL reactor, Grenoble, using the LOHENGRIN mass spectrometer, through thermal-neutron induced fission reactions of Pu targets. The level schemes of the odd-mass 123-129In are reported. A shell-model study of the heaviest In and Cd nuclei was performed using a realistic interaction derived from ...

An effective nucleon-nucleon interaction adapted to cluster-model calculations of collisions is derived from the realistic Argonne potential AV18 with the unitary correlation operator method. The unitary correlation is determined from the ?+? elastic phase shifts calculated in a cluster approach by the generator coordinate method coupled with the ...

A new limit is presented on the axion-like monopole-dipole P, T-non-invariant interaction in a range (10?4-1) cm. The spin-dependent nucleon-nucleon potential between neutrons and nucleons of the walls of the cavity containing ultra-cold neutrons should affect the neutron depolarization probability at their reflection from the walls. The limit is obtained ...

Results are presented of an analytic relativistic calculation of a OBE nucleon-nucleon (NN) interaction employing the Gross equation. The calculation consists of a non-relativistic reduction that keeps the negative energy states. The result is compared to purely non-relativistic OBEP results and the relativistic effects are separated out. One finds that the resulting ...

It is shown how a bare three-nucleon force is incorporated into the formalism of the effective interaction approach for hyperspherical harmonics. As a practical example we calculate the ground-state properties of 3H and 3He using the Argonne V18 nucleon-nucleon potential and the Urbana IX three-nucleon force. A very good convergence of binding energies and ...

We use the Hartree-Fock-Bogoliubov method with the Gogny nucleon-nucleon effective interaction D1S to calculate potential energy surfaces in the elongation-asymmetry plane, from sphericity to very large deformations, for the 226Th and 256,258,260Fm fissioning systems. Using a criterion based on the nuclear density, many scission configurations are ...

We calculate the dependence of the deuterium binding energy upon the Higgs vacuum expectation value (v), by using different effective nucleon-nucleon potentials, and set constraints on the time variation of the Higgs vacuum expectation value from Big Bang Nucleosynthesis. The analysis is based on the calculation of the abundances of primordial D, 4He and ...

We perform shell model Monte Carlo calculations for nuclei in the 100Sn region within the complete Og-1d-2s oscillator shell using an effective interaction derived from the Paris nucleon-nucleon potential. We find good agreement with empirically calculated masses, and reproduce the observed quenching of the total Gamow-Teller strengths in this mass region. ...

The coherence length of superfluid neutron matter is calculated from the microscopic BCS wave function of a Cooper pair in momentum space making use of recent nucleon-nucleon potential models and including polarization (RPA) effects. We find as our main result that the coherence length is proportional to the Fermi momentum to pairing gap ratio, in good ...

The breakup reaction has been investigated in the past at several tandem accelerator energies below 20MeV in a number of ``classical'' kinematical configurations. These data are compared with predictions of four modern high-precision nucleon-nucleon potentials, calculated for 2H(n,np)n, i.e., without inclusion of the Coulomb interaction. The results show ...

We investigate the equation of state of asymmetric nuclear matter and its isospin dependence in various spin-isospin ST channels within the framework of the Brueckner-Hartree-Fock approach extended to include a microscopic three-body force (TBF). It is shown that the potential energy per nucleon in the isospin-singlet T = 0 channel is mainly determined by the contribution from ...

A distorted-wave method is used to analyse nucleon-nucleon scattering in the 1 S 0 channel. Effects of one-pion exchange are removed from the empirical phase shift to all orders by using a modified effective-range expansion. Two-pion exchange is then subtracted in the distorted-wave Born approximation, with matrix elements taken between scattering waves for the one-pion ...

The nuclear equation of state is a broadly useful tool. Besides being the main input of stellar structure calculations, it allows a direct connection to the physics of nuclei. For instance, an energy functional (such as a mass formula), together with the energy/particle in nuclear matter, can be used to predict nuclear energies and radii [1]. The single-particle properties are also a key point to ...

We present new accurate measurements of the differential cross section {sigma}({theta}) and the proton analyzing power A{sub y} for proton-{sup 3}He elastic scattering at various energies. A supersonic gas-jet target has been employed to obtain these low-energy cross-section measurements. The {sigma}({theta}) distributions have been measured at E{sub p}=0.99, 1.59, 2.24, 3.11, ...

Low-energy nuclear processes with momenta much below the pion mass may be described by an effective field theory (EFT) with only the nucleons and photons as dynamical degrees of freedom. In this EFT, we compute several observables analytically in a model-independent way in the two-nucleon sector for elastic and inelastic processes involving the deuteron. The elastic processes include ...

The availability of new, high-intensity, cold and thermal neutron sources has opened the possibility of performing high-precision fundamental neutron physics experiments, including measurements that study the hadronic weak interaction and standard model test measurements, using neutron {beta} decay. The observables in these experiments are usually correlated with the direction of neutron ...

The availability of new, high-intensity, cold and thermal neutron sources has opened the possibility of performing high-precision fundamental neutron physics experiments, including measurements that study the hadronic weak interaction and standard model test measurements, using neutron ? decay. The observables in these experiments are usually correlated with the direction of neutron polarization ...

Analytical properties of the S matrix are obtained with respect to the strength of any potential in the radial Schrodinger equation. Some properties of the analogs of Regge trajectories are derived in the same way, which should give information on the radius of convergence of Born expansion. Enough information is obtained by restricting the study to ...

Deuteron stripping reactions are considered. The short-range correlations for the nucleons in the nuclei are taken into account. The neutron- proton nuclear potential in the deuteron is taken as a long-range attractive potential surrounded by a short-range repulsive potential. We take different forms for the two parts of the ...

The single-particle potential in nuclear matter is calculated microscopically for several Hamiltonians for densities ranging from 0.1 to 0.5 fm/sup -3/. These Hamiltonians include nucleon-nucleon potentials fit to scattering data and three-nucleon potentials fit to the binding energies of few-body nuclei and ...

Variationally optimized T matrices and phase shifts are reported for three potential scattering problems: (1) elastic scattering from a square well with a P state resonance, (2) elastic scattering from a Morse potential parameterized to fit S state nucleon--nucleon scattering data, and (3) off shell diagonal and nondiagonal scattering ...

Potentials of the weak interaction of nucleons via exchange of nonet vector mesons are obtained in the Weinberg-Salam model with the use of vector dominance. The contribution of neutral hadronic currents to the potential of the weak interaction due to exchange of charged ..pi.. mesons is found. The isotopic structure of the potentials ...

We study the proton-deuteron radiative capture reaction at low energies ({ital E}{sub {gamma}}{congruent}10 MeV) with the three-nucleon Faddeev wave functions for various combinations of available realistic nucleon-nucleon potentials and the two-pion exchange three-nucleon potential. The calculated values of tensor analyzing power ...

A meson-theoretic model of the intermediate range nucleon-nucleon potential is presented with emphasis placed on the two-pion exchange contribution. The Bethe-Salpeter equation is reduced, by the Blankenbecler-Sugar technique, to a Lippmann-Schwinger equation, from which an approximate nonlocal, energy-dependent potential is obtained. ...

Local phase equivalent interactions to the nonlocal Kerman, McManus, and Thaler multiple scattering nucleon-nucleus optical potentials are determined. Both first- and second-order contributions in the free nucleon-nucleon transition amplitude are included. The second-order terms modify the derived potentials in a nontrivial way and ...

The radial dependence of the optical potential for nucleonnucleus scattering is calculated using the empirical nuclear density. The nucleus is locally approximated by the Fermi model. The equation for scattering in the nuclear medium is solved approximately, and the optical potential is expressed using nucleon-nucleon phase ...

The kinematics of high-energy nucleon-nucleon collisions are examined in the laboratory system amd the rest-frame of the center-of-mass, and the appropriate Lorentz transformation is describod in detail. Some of the results are applied to the production of pions and antinucleons. (auth)

Nucleon-nucleon scattering lengths are calculated using QCD sum rules. The calculation is based on the observation that the coefficient of the second-order pole term of the nucleon correlation function is proportional to the nucleon-nucleon scattering len...

A summary of the medium energy nucleon-nucleon elastic and inelastic scattering data is presented from an experimenter's viewpoint. Motivation for additional measurements is given. Experiments which rely on the unique capabilities of the Indiana Cooler are emphasized. 65 references.

Mar 1, 2008 ... March 2008. NASA/TP-2008-215116. Nucleon-Nucleon Total Cross Section. John W. Norbury. Langley Research Center, Hampton, Virginia ...

Double-charge-exchange reactions induced by pions are shown to furnish a direct means of detecting nucleon-nucleon correlations in nuclei. For the particular case of double isobaric analog transitions the effect of correlations is easily isolated and quit...

With the advent of the possibility to study nucleon-nucleon scattering at medium energies, its extension to investigate fundamental symmetries was recognized early on. It was precisely the introduction of rotational invariance, parity conservation, time r...

nucleon-nucleon collisions the probability that a given secondary ... ten collisions in succession. lo Furthermore, it appears evident ...

in such a way that \\Phi is exactly the same for nucleon� nucleon (N--N) and nucelus�nucelus (A--A) collisions

We have calculated the ground-state energy of the doubly magic nuclei {sup 4}He, {sup 16}O, and {sup 40}Ca within the framework of the Goldstone expansion starting from various modern nucleon-nucleon potentials. The short-range repulsion of these potentials has been renormalized by constructing a low-momentum ...

A Skyrme-type momentum-dependent nucleon-nucleon force distinguishing isospin effect is parametrized and further implemented in the Lanzhou quantum molecular dynamics model, which leads to a splitting of nucleon effective mass in nuclear matter. Based on the isospin- and momentum-dependent transport model, we investigate the influence of momentum-dependent symmetry ...

The summing of all pion bubble graphs in the computation of the sigma-meson propagator leads to the appearance of ghost poles when sigma..pi pi.. coupling strengths are equivalent to sigma-meson decay widths greater than 625.2 MeV. A result satisfying dispersion relations is obtained by the direct subtraction of the ghost pole from the results published previously by this author. The effect is to ...

Proton-proton bremsstrahlung and elastic nucleon-nucleon scattering: relativistic formulations-proton bremsstrahlung and elastic nucleon-nucleon scattering: relativistic formulations Proefschrift ter verkrijging van for bremsstrahlung 5 2.1 A relativistic covariant model for bremsstrahlung . . . . . . . . . . . . . . 5 2

The in-medium nucleon-nucleon amplitudes are extracted from the available proton-nucleus total reaction cross sections data. The retrieval of the information from the experiment makes the estimate of reaction cross sections very reliable. Simple expressions are given for the in-medium nucleon-nucleon amplitudes for any system of colliding nuclei as a ...

We present a systematic study of the energy of vanishing flow by considering symmetric colliding nuclei (between {sup 12}C and {sup 238}U) at normalized impact parameters using variety of equations of state (with and without momentum dependent interactions) as well as different nucleon-nucleon cross sections. A perfect power law mass dependence is obtained in all the cases ...

We present a multienergy partial-wave analysis of all [ital NN] scattering data below [ital T][sub lab]=350 MeV, published in a regular physics journal between 1955 and 1992. After careful examination, our final database consists of 1787 [ital pp] and 2514 [ital np] scattering data. Our fit to these data results in [chi][sup 2]/[ital N][sub df]=1.08, with [ital N][sub df]=3945 the total number of ...