MESON-NUCLEON AND MESON-NUCLEUS SCATTERING

Abstract

Pi meson interactions with free nucleons as known from recent exper­ iments have been fit by Arndt et al. in the form of phase shifts. In the present work these phase shifts are fit by a simple parametrization, and observables computed from the resulting parametrized phase shifts are compared success­ fully to important examples of recent measurements. The parameters of this work are readily suited to pion-nucleus optical model codes built upon the impulse approximation. Some examples of the effect of the new pion-nucleon data upon these pion-nucleus calculations are shown, relative to older results based upon far fewer pion-nucleon data. Analysis of pion-nucleus have been done using the equivlant local potential to calculate the differential elastic cross section in the energy range of 30 to 292 MeV. First time the DWUCK4 computer program is used to predict observables of pion-nucleus elastic scattering. The results are in better agreement with recent data in the selected nuclei. 'vVe have carried out a parallel analysis of K+ -proton phase shifts, using again the fitted phase shifts as used for pions,