Theoretical modification on semiclassical distorted wave model and its application to the study of spin observables

The semiclassical distorted wave (SCDW) model of nucleon inelastic and charge exchange scattering at intermediate energies is modified to take accurate account of off-the-energy-shell matrix elements of the in-medium N-N interaction and explicit account of the exchange of colliding two nucleons, making use of the G matrix parametrized in coordinate representation. The effects of the modification on the double differential inclusive cross sections are discussed for the cases of (p,p′x) and (p,nx) reactions on ⁹⁰Zr at 160 MeV. The modification enables the SCDW model to calculate spin observables. The depolarizations in ⁵⁸Ni(p,p′x) at 80 MeV and ⁹⁰Zr(p,p′x) and ⁹⁰Zr(p,nx) at 160 MeV by one-and two-step processes are calculated, and the result for ⁵⁸Ni(p,p′x) is compared with experimental data. The calculated spin flips in (p,p′x) and (p,nx) on ⁹⁰Zr are analyzed in terms of the effects of in-medium modification of the N-N interaction and the contributions of individual components of the effective interaction.