Σ+p elastic scattering cross sections in the region of 350⩽PΣ+⩽750 MeV/c with a scintillating fiber active target

A new model for short-range isoscalar currents in the deuteron and in the NN system is developed. The model is based on the generation of an intermediate dressed dibaryon, which is the basic ingredient for the medium- and short-range NN interaction proposed recently by the present authors. The new current model has only one free parameter, which has a clear physical meaning. Our calculations have demonstrated that this new current model can very well describe the experimental data for three basic deuteron observables of isoscalar magnetic type: the magnetic moment, the circular polarization of the photon in the n-vectorp{yields}d{gamma}-vector process at thermal neutron energies, and the structure function B(Q{sup 2}) up to Q{sup 2}{approx_equal}2 GeV{sup 2}/c{sup 2}.

Isoscalar short-range current in the deuteron induced by an intermediate dibaryon

Predictions of modern NN interactions for cross sections and spin observables in three-nucleon scattering are displayed. The agreement with experimental data is in general very good, but there are challenging exceptions, which might point to deficiencies in the dynamical input. First results including three-nucleon-deutron scattering below and above the three-nucleon breakup threshold are shown, which illustrate the complexity of composite particle scattering. A systematic study covering all possible breakup configurations is discussed, where those configurations are identified, which are totally insensitive to the choice of the specific NN interaction and those, which are very sensitive. Similarly those scattering observables which do not scale are shown. Finally an application of the interacting three nucleon continuum to exclusive and inclusive electron scattering on {sup 3}He is described and first results are compared to data.

The three-nucleon continuum: Achievements, challenges, and applications

This paper presents a framework to solve the Faddeev equations for three-nucleon scattering using the wave-packet continuum-discretization method. The authors perform benchmark calculations with chiral nucleon-nucleon interactions. The paper represents a first step toward a systematic inclusion of three-nucleon scattering in the construction of next-generation nuclear interactions. 

/pdf/neutron-deuteron-scattering-cross-sections-with-chiral-mml-f6x8q9em.pdf

Neutron-deuteron scattering cross sections with chiral <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>N</mml:mi><mml:mi>N</mml:mi></mml:mrow></mml:math> interactions using wave-packet continuum discretization

Contributions of three-nucleon forces (3NF) to proton-deuteron scattering observables at energies below the deuteron breakup threshold are studied by solving the Faddeev equation that includes the Coulomb interaction. At ${E}_{p}=3.0\mathrm{MeV},$ we find that the central part of a two-pion exchange 3NF removes the discrepancy between measured cross sections and the calculated ones by two-nucleon forces, and improves the agreement with ${T}_{22}$ experimental data. However, the tensor part of the 3NF fails in reproducing data of the analyzing power ${T}_{21}$ by giving worse agreement between the measured and the calculated. Detailed examinations of scattering amplitudes suggest that a P-wave contribution in spin-quartet tensor amplitudes has unsuitable sign for reproducing the ${T}_{21}$ data.

/pdf/central-and-tensor-components-of-three-nucleon-forces-in-low-fa96hm1xjc.pdf

Central and tensor components of three-nucleon forces in low-energy proton-deuteron scattering

In neutron-deuteron scattering, four total cross sections are shown to form a complete set for the determination of the imaginary parts of the forward amplitudes by means of the optical theorem. The amplitudes are decomposed into scalar and tensor components in spin space. Contributions of three-nucleon forces ~3NF! to these amplitudes are studied by Faddeev calculations. Significant effects of the 3NF on the tensor components are predicted.

Complete set of total cross sections for imaginary parts of nd forward scattering amplitudes, and three-nucleon force effects

Three-nucleon forces, which compose an up-to-date subject in few-nucleon systems, provide a good account of the triton binding energy and the cross section minimum in proton-deuteron elastic scattering, while do not succeed in explaining spin observables such as the nucleon and deuteron analyzing powers, suggesting serious defects in their spin dependence. We study the spin structure of nucleon-deuteron elastic amplitudes by decomposing them into spin-space tensors and examine effects of three-nucleon forces to each component of the amplitudes obtained by solving the Faddeev equation. Assuming that the spin-scalar amplitudes dominate the others, we derive simple expressions for spin observables in the nucleon-deuteron elastic scattering. The expressions suggest that a particular combination of spin observables in the scattering provides direct information of scalar, vector, or tensor component of the three-nucleon forces. These effects are numerically investigated by the Faddeev calculation.

Spin observables in nucleon-deuteron scattering and three-nucleon forces

We investigate polarization observables in hyperon-nucleon scattering by decomposing scattering amplitudes into spin-space tensors, where each component describes scattering by corresponding spin-dependent interactions, so that contributions of the interactions in the observables are individually identified. In this way, for elastic scattering we find some linear combinations of the observables sensitive to particular spin-dependent interactions such as symmetric spin-orbit sLSd interactions and antisymmetric LS ones. These will be useful to criticize theoretical predictions of the interactions when the relevant observables are measured. We treat vector analyzing powers, depolarizations, and coefficients of polarization transfers and spin correlations, a part of which is numerically examined in o + p scattering as an example. Total cross sections are studied for polarized beams and targets as well as for unpolarized ones to investigate spin dependence of imaginary parts of forward scattering amplitudes.

/pdf/polarization-phenomena-in-hyperon-nucleon-scattering-1ov1k9xdoi.pdf

Polarization phenomena in hyperon-nucleon scattering

We derive relation formulas for proton depolarizations in proton-$^{3}\mathrm{He}$ ($p\text{\ensuremath{-}}$$^{3}\mathrm{He}$) elastic scattering in a form that makes it easy to identify contributions of spin-dependent interactions. The formulas explain approximate relations found in the depolarizations measured at ${E}_{p}=800\phantom{\rule{0.3em}{0ex}}\text{MeV}$ when the magnitudes of scattering amplitudes due to $p\text{\ensuremath{-}}$$^{3}\mathrm{He}$ spin--spin and tensor interactions are small. This nature of the interactions is investigated from the viewpoint of folding models. It is shown that the spin--spin and tensor interactions are significantly diminished owing to characteristics of nucleon densities of $^{3}\mathrm{He}$, which are calculated from a solution of the Faddeev equation. A folding model calculation with the densities and a simple nuclear potential shows that the $p\text{\ensuremath{-}}$$^{3}\mathrm{He}$ spin--spin interaction is much weaker than the spin-independent central interaction.

Relationships among depolarizations in scattering of polarized protons from 3He at intermediate energies

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