Elastic and inelastic proton scattering from 112, 114Cd

Abstract

Differential cross sections for elastic and inelastic scattering of 13 MeV protons by 112, 114Cd have been measured. Special effort was made to extract cross sections for the excitation of states which occur in the two-phonon region. The elastic scattering was fitted by searching for the best parameters of an optical model. The observed cross sections for excitation of the one-phonon 2 + and 3 − states were compared to the predictions of both the DWBA theory and the coupled-channel theory. Distortion parameters were extracted and compared to the electromagnetic values. The differential cross sections for excitation of the two-phonon states are very similar for the two cadmium isotopes, and they are also similar to those previously observed for the palladium isotopes. The coupled-channel theory is used to interpret the excitation of the two-phonon states. An appreciably better fit to the observed cross sections for excitation of the second 2 + states is obtained if a small admixture of the one-phonon state is assumed for the description of these states.