Optical Model description of fusion and elastic scattering of 6Li + (58Ni, 64Zn) at sub-barrier energies

Abstract

Recently reported fusion cross sections for 6Li + (58Ni, 64Zn) have been reduced and compared with each other. Fairly good consistency was found but with some data spread at low energies, possibly due to contributions of direct reactions to the respective inclusive data. This possibility is investigated by doing Optical Model calculations that simultaneously fit the experimental elastic scattering and fusion data. In addition to a realistic bare potential, fusion and direct polarization potentials are introduced which in principle allow to separate the contributions of the corresponding reaction mechanisms. Good fits are obtained for elastic scattering data at all energies but the fusion data for both systems are underpredicted at the lowest energies. These results are consistent with a possibly dominant contribution of direct reactions to the corresponding inclusive data