Inelastic proton scattering and one-particle-one-hole excitations in light nuclei

Abstract

The inelastic scattering of 17.5 MeV protons from ten normal-parity states in 16O, 28Si and 32S has been analysed in the DWBA treatment. In a microscopic description, the form factors were calculated with nuclear wave functions of the 1p1h model and a spin-independent effective interaction with a Gaussian shape and a range of 1.7 fm. The strength of the effective interaction derived from normalizing the computed curves to the experimental differential cross section varies between 50 MeV and 80 MeV. The measured relative cross sections for the excitation of different levels in a nucleus are reproduced within a factor of two. For strongly excited 2 1 + and 3 − 1 states and for the second 2 + state in 32S, the general tendency in the shape of the angular distribution is given by the calculations. The angular distribution in the scattering from other (weakly excited) levels and the asymmetry in the inelastic scattering of polarized particles from collective states are not described correctly.