Sub- and above-barrier fusion of loosely bound 6Li with 28Si

Fusion excitation functions are measured for the system 6Li+28Si using the characteristic γ -ray method, encompassing both the sub-barrier and above-barrier regions, viz, Elab = 7-24 MeV. Two separate experiments were performed, one for the above-barrier region (Elab = 11-24 MeV) and another for the below-barrier region (Elab=7-10 MeV). The results were compared with our previously measured fusion cross-section for the 7Li + 28Si system. We observed the enhancement of the fusion cross-section at sub-barrier regions for both 6Li and 7Li, but the yield was substantially larger for 6Li. However, for well-above-barrier regions, a similar type of suppression was identified for both the systems. (orig.)