Effect of the α-nucleus interaction on the 29,30Si(α,d)31,32P reaction -: art. no. 034605

Microscopic and macroscopic distorted wave Born approximation calculations have been performed using the molecular, standard Woods-Saxon (WS). and squared WS (Michel) alpha -nucleus potentials to analyze the angular distributions of cross sections for nine transitions to the even-parity states up to excitation energy E-x = 4.26 MeV of P-31 and eight transitions to the even-parity states up to E-x = 3.00 MeV of P-32 populated in the (alpha ,d) reaction at 25 MeV incident energy on the non-alpha cluster Si-29,Si-30 nuclei. The parameters of the three types of the alpha -nucleus potentials are determined from the elastic alpha -scattering data. The molecular potential, without any adjustment to the parameters needed to fit the elastic scattering data, is able to reproduce, simultaneously, the absolute cross sections and the pattern of angular distributions, but the WS and Michel potentials, obtained from the best fits to the elastic scattering data, are found to underestimate the cross sections by one to two orders of magnitude. The spectroscopic factors for the d-cluster transfer are deduced from the full finite-range macroscopic distorted-wave Born approximation, for nine and eight transitions to states in P-31 and P-32, respectively, using all three potentials and are compared to those calculated by the shell model, which agree with those deduced from the fits to the data using the molecular potential only.