Morton M. Sternheim

Absence of attraction in the NN central potential derived from skyrmions

Abstract The nucleon-nucleon potential is studied using a skyrmion lagrangian containing terms of second, fourth, and sixth order in the field derivatives; the fourth-order pieces contain both an antisymmetric (repulsive) form and a symmetric (attractive) one. No attraction is found in the central NN potential VC when the full structure of the sixth-order term is retained. As yet another candidate for the source of attraction in VC, admixtures of ΔΔ components in the two-baryon wave function are considered. These slightly lower the values of VC for 1 ⩽ R ⩽ 2 fm, but by no means sufficiently to bring about a net attraction there. Thus the challenge of finding sources of attraction in the skyrmion approach remains.

Baryon number ambiguities in the symmetrized product ansatz for the Skyrme model

Abstract It is shown that, at small internucleon separations, the symmetrized product ansatz for the two-nucleon system in the Skyrme model does not satisfy the requirement that the baryon number equals two.

Pion scattering by 3He and 3H

Abstract Elastic π-3H and π-3He scattering has been suggested as a highly sensitive probe of small nuclear wave function components. More detailed calculations considerably reduce this sensitivity.

Resource Letter MENP-1: Medium Energy Nuclear Physics.

Prepared at the request of the AAPT Editorial Board for Resource Letters. This is one of a series of Resource Letters on different topics intended to guide college physicists, astronomers, and other scientists to some of the literature and other teaching aids that may help improve course contents in specified fields. No Resource Letter is meant to be exhaustive and complete; in time there may be more than one letter on some of the main subjects of interest. Comments on these materials as well as suggestions for future topics will be welcomed. Please send such communications to Professor Aaron Owens, Editor, Resource Letter Board, Department of Physics, Lake Forest College, Lake Forest, Illinois 60045.Notation: The letter E after an item number indicates elementary level; the letter I indicates intermediate level; and the letter A indicates advanced material. An asterisk (*) indicates those references we feel to be especially helpful.Reprints: When ordering, request Resource Letter MENP‐1. Enclose 50 cents...

π± Absorption Cross Sections and Neutron Density Parameters

A recent reanalysis1 of the old 700 MeV π± — Pb inelastic scattering experiment of Abashian, Cool, and Cronin2 led to a clear contradiction with current suggestions of a neutron-rich surface or “halo” unless one introduced physically unreasonable neutron distributions. This report will present estimates of the sensitivity of similar experiments to nuclear density parameters for representative nuclei as a function of energy.