Angular zone of influence for fusion and direct reactions on elastic scattering of 6Li with 58Ni, 59Co, 64Ni, and 64Zn

Abstract

Recently, a systematic study of fusion and elastic scattering data was performed for the 6Li + (58Ni, 59Co, 64Ni, 64Zn) systems. Appropriate polarization potentials satisfying the dispersion relation were extracted, which can be associated to fusion and direct reaction couplings, respectively. By examining the relative strengths of the corresponding absorptive parts, a semiclassical analysis can be carried out which gives an indication about the angular range where direct (fusion) reactions are more important in determining the elastic scattering angular distributions. The results of such an analysis are presented for all four systems. The developed method is useful to explore the sensitivity of the elastic scattering angular distributions to the radial details of the phenomenological optical model potential. An example is presented where large sensitivity to distances smaller than the Coulomb barrier radius is evident.