Compound nucleus contribution to the alpha particle scattering from 28Si

In the case of inelastic scattering of alpha particles to the 3+ state, the averaged angular distributions show a characteristic shape, corresponding to the excitation of such an unnatural parity state by alpha particles in the compound nucleus process. The modified Hauser-Feshbach cross-section calculations give a good description of the averaged distributions for the alpha particle scattering to the 3+ state and the compound nucleus parameters could be extracted. The calculations of the compounds nucleus contributions to the other states in the case of 24 MeV alpha particle scattering from 28Si show that this contribution is not negligible and in the case of the scattering to the 4+ state seems to be dominant. (Z.M.)