On the Charge Exchange Collision in Nucleon-Deuteron

Abstract

The charge exchange collision in nucleon-deuteron is investigated by using the two-nucleon scattering phase shifts, in order to supplement some information regarding the two-nucleon interaction with the singlet isotopic spin state, and also to study a source of the partially polarized neutron beam which is very useful to investigate the interaction between the neutron and a certain nucleus. The differential cross section, polarization and triple scattering para­ meters of the nucleon ejected in the charge exchange nucleon-deuteron collision are calculated by using the Gammel-Thaler and Signell-Marshak phase shifts. The energy distribution of the ejected nucleon is calculated by means of the cross section of magnetic dipole photo­ disintegration of the deuteron, instead of the explicit use of the wave functions of the di­ neutron (or di-proton) and the deuteron to evaluate the nuclear matrix element. The polarization and triple scattering parameter of the nucleon quasi-elastically ejected from the nucleus, say, C12, in the charge exchange collision and of the nucleon caused by the free n(p, n)p- and p(n, p)n-processes are calculated for comparison. § I. Introduction Recently the information regarding the nucleon-nucleon interactions has been greatly increased in the analyses of experimental data for the two-nucleon scattering at high energies. In the framework of the impulse approximation, the interactions between the high energy nucleon and the nucleus, and between two nucleons in the nucleus can be understood on the basis of the information on the two-nucleon system. 2 l This makes possible to calculate the differential cross sections and polar­ izations of nucleons scattered from nuclei by using sets of the two-nucleon scat­ tering phase shifts. By comparing the calculated results with the experimental data for every set of the phase shifts, one can reject some of the sets of the phase shifts. 3 l, 4 l On the same lines, in the present paper we consider the spin dependent interaction between two nucleons from somewhat different point of view from the free two-nucleon scattering. The information regarding the two-nucleon system is supplemented by the investigation on the spin dependent interaction. The investigation is that of the high energy nucleon ejected in the high energy charge exchange nucleon-deuteron collision. The investigation on the collision gives a certain way to study the spin depend­ ence of the nucleon forces bt. +ween two nucleons. 'I'his comes from the fact that