Effect of the alpha-nucleus potential on the Si-28(alpha,p)P-31 reaction -art. no. 054606

The differential cross section of the Si-28(alpha ,p)P-31 reaction for 26 M eV incident energy has been analyzed in the distorted wave Born approximati on (DWBA) with zero and full-finite range using a deep and shallow optical, Michel and molecular potentials in the incident channel, and a usual optic al model potential for proton in the final channel. The parameters of poten tial in the entrance channel are determined from the elastic scattering dat a. The calculations done with the deep optical and Michel potentials reprod uce the structure of the angular distributions reasonably well, but fail to account for the absolute magnitudes by a few orders. The shallow optical o ne is satisfactory up to about theta (c.m.) = 100 degrees. The molecular po tential, on the other hand, reproduces both the absolute cross sections and the pattern of the angular distributions. Coupled-channels Born approximat ion calculations improve fits to the data over the DWBA predictions.