S. Ishikawa

Two-pion exchange three-nucleon potential : O(q4) chiral expansion

We present the expansion of the two-pion exchange three-nucleon potential (TPE-3NP) to chiral order q 4 , which corresponds to a subset of all possibilities at this order and is based on the πN amplitude at (q 3 ). Results encompass both numerical corrections to strength coefficients of previous (q 3 ) terms and new structures in the profile functions. The former are typically smaller than 10% whereas the latter arise from either loop functions or nonlocal gradients acting on the wave function. The influence of the new TPE-3NP over static and scattering three-body observables has been assessed and found to be small, as expected from perturbative corrections.

Analyzing power in elastic scattering of 6He from a polarized proton target at 71 MeV/nucleon

The vector analyzing power has been measured for the elastic scattering of neutron-rich {sup 6}He from polarized protons at 71 MeV/nucleon making use of a newly constructed solid polarized proton target operated in a low magnetic field and at high temperature. Two approaches based on local one-body potentials were applied to investigate the spin-orbit interaction between a proton and a {sup 6}He nucleus. An optical model analysis revealed that the spin-orbit potential for {sup 6}He is characterized by a shallow and long-ranged shape compared with the global systematics of stable nuclei. A semimicroscopic analysis with an {alpha}+n+n cluster folding model suggests that the interaction between a proton and the {alpha} core is essentially important in describing the p+{sup 6}He elastic scattering. The data are also compared with fully microscopic analyses using nonlocal optical potentials based on nucleon-nucleon g matrices.

Analyzing power for proton elastic scattering from the neutron-rich He6 nucleus

Vector analyzing power for the proton-{sup 6}He elastic scattering at 71 MeV/nucleon has been measured for the first time, with a newly developed polarized proton solid target, which works at a low magnetic field of 0.09 T. The results are found to be incompatible with a t-matrix folding model prediction. Comparisons of the data with g-matrix folding analyses clearly show that the vector analyzing power is sensitive to the nuclear structure model used in the reaction analysis. The {alpha}-core distribution in {sup 6}He is suggested to be a possible key for understanding the nuclear structure sensitivity.

Inclusive scattering of polarized electrons on polarized {sup 3}He: Effects of final state interaction and the magnetic form factor of the neutron

Effects of final state interaction on asymmetries in inclusive scattering of polarized electrons on polarized 3He are investigated using consistent 3He bound state wave function and 3N continuum scattering states. Significant effects are found, which influence the extraction of the magnetic neutron form factor from AT ′ . The enhancement found experimentally for ATL′ near the 3N breakup threshold, which could not be explained in calculations carried through in plane wave impulse approximation up to now, occurs now also in ∗present address: Institut für Kernphysik, Fachbereich 5 der Technischen Hochschule Darmstadt, D-64289 Darmstadt, Germany †present address: Los Alamos National Laboratory, Theoretical Division, Los Alamos, NM 87545

Coordinate space proton-deuteron scattering calculations including Coulomb force effects

We present a practical method to solve the proton-deuteron scattering problem at energies above the three-body breakup threshold, in which we treat three-body integral equations in coordinate space accommodating long-range proton-proton Coulomb interactions. The method is examined for phase shift parameters and then applied to calculations of differential cross sections in elastic and breakup reactions, analyzing powers, etc., with a realistic nucleon-nucleon force and three-nucleon forces. The effects of the Coulomb force and the three-nucleon forces on these observables are discussed in comparison with experimental data.

Decay and structure of the Hoyle state

The first

Analyzing power in nucleon-deuteron scattering and three-nucleon forces

0^+

Low-Energy Proton-Deuteron Scattering with a Coulomb-Modified Faddeev Equation

resonant state of the

Reaction mechanism and characteristics ofT20ind+3Hebackward elastic scattering at intermediate energies

^{12}

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

C nucleus