A new polarization potential for heavy ion fusion spin distribution

The real part of the polarization potential which depends on both energy and angular momentum is calculated in a simple way using dispersion relation. A barrier penetration model (BPM) has been used to explain the fusion cross section and compound nucleus spin distribution for 32S+64Ni system in the energy range 50-75 MeV. It is also shown that the polarization potential which only depends on energy, is not adequate to give rise to correct spin distribution even including any radial dependence. The proposed polarization potential with implicit E and I dependences is able to explain both fusion cross section and average spin values. (author). 33 refs., 6 figs