Further Study and Analysis of the 7 Li on 56 Fe Reaction at 50 MeV Incident Energy

Abstract

We present deuteron and triton spectra measured at 12 laboratory angles from the reaction of 50 MeV 7 Li on 56 Fe together with evaporative components as modeled by CASCADE and fitted to the backward angle data. The deuteron and triton "break-up" spectra obtained by subtracting the evaporative components from the measured spectra are also presented. The break-up of the 7 Li projectile near the surface occurs with high probability and the major fraction of the break-up cross-section is taken by (7 Li,α) transfer process. A crude estimate of the fraction of the total cross-section is found to be of the same order of magnitude as the overall spectroscopic factor determined by the diffraction model. The value of the estimated fraction of total cross section at 50 MeV incident energy is compared to that at 68 MeV incident energy for the same reaction. However, these values of estimated fraction of total cross section are found very much consistent with the measured yields at both incident energies. The importance of the level density parameter in locating the maximum of excitation energy is indicated in the diffraction model.