DOUBLE-FOLDING MODEL POTENTIAL FOR LI-6 SCATTERING WITH HE-4 - ABSENCE OF ANOMALOUS REDUCTION FACTOR

A microscopic Li-6 + He-4 interaction potential has been constructed i n a double-folding model with the M3Y interaction and a single-nucleon -exchange term. Elastic scattering calculations with this potential to gether with a deuteron exchange mechanism reproduce the alpha + Li-6 e lastic-scattering data at 36.6, 50, and 166 MeV in the forward- and ba ck-angle regions, without any reduction factor. The exchange mechanism explains the large back-angle cross sections without affecting the fo rward-angle predictions. A recently formulated microscopic potential o f Kamal et al. is also found to give a good fit to the forward-angle d ata at 36.6 and 50 MeV without renormalization. The latter however fai ls at 166 MeV. Inclusion of the deuteron exchange mechanism in the pot ential of Kamal et al. is also necessary to account for the large back -angle cross sections. The significance of the results in the context of the Li-6 target breakup reactions recently studied at low relative fragment energies is discussed.