Study of spin effects in neutron-proton interactions at intermediate energies at PSI

Abstract

An intensive program of n-p measurement of spin observables in elastic and pion production reactions has been performed at the Paul Scherrer Institute taking advantage of the high intensity polarized neutron beam. In the elastic reaction 16 different spin observables have been measured for kinetic energies from 210 to 590 MeV with the centre of mass angular range from 60 to 180 degrees. This will allow to perform direct reconstruction in the model independent way of the isospin I=0 scattering amplitudes in elastic NN interaction. Three body final state process ~p-ppTr-with polarized neutrons in exclusive experiment has been investigated. Objectives and backroundIt is essential to have clear understanding of the nucleon-nucleon interaction as it bears directly on a variety of topics in both particle and nuclear physics, such as nuclear forces, the scattering of nucleons from nuclei and allowable quark configuration etc. The elastic nucleon-nucleon interaction is the basic reaction to