Inelastic Scattering of Protons by Various Nuclei

Experimental data on the inelastic scattering of 23-Mev protons reported by Cohen, Mosko, and Rubin are analyzed by using the theory of direct interaction together with the plane wave approximation. The most detailed analysis is done for lead isotopes and, at least at 90°, it is found that fairly good agreement with experiment is obtained for the relative magnitudes of the excitation of different excited states. The same idea is also applied to other cases and in particular several arguments are given which will support the view of Lane and Pendlebury for associating the anomalous peaks observed at ≈2.5 Mev for nuclei with $Z=30-53\mathrm{}$ with the octupole surface vibrations. Finally discussions are given of the validity of the approximations used in the present analysis and also of the circumstances which still need more refined calculations.