Abstract
Microscopic distorted wave impulse approximation (DWIA) calculations are presented for composite-particle charge exchange scatterings at intermediate energies. A method is developed which permits the exact calculation of the so-called knock-on exchange transition amplitudes. The basic tool used in these calculations is the multipole expansion method which is repeatedly applied to carry out multidimensional integrals. Based on this method a new computer code has been developed which is applied to the 90Zr( 3He, t) reaction at 600 MeV incident energy. The no-recoil approximation to the knock-on exchange transition amplitude is investigated. The importance of tensor exchange effects for the ( 3He, t) reaction is discussed. A microscopic analysis of the forward angle 90Zr( 3He, t) spectra is presented using random phase approximation (RPA) wave functions for the description of the nuclear excitation spectrum. We find that the theoretical cross sections calculated with these wave functions describe the data rather well at all scattering angles.
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