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Fusion barrier distributions have been extracted from the quasi-elastic scattering excitation functions, measured at backward angle θlab = 160° in reactions of 6,7Li+209Bi. The present results have been compared with the barrier distributions obtained from the fusion excitation function measurements for the above mentioned systems. The fusion barrier distributions from the quasi-elastic scattering excitation functions have been analyzed with simplified Coupled Channels calculations using Fresco. Inclusions of resonant states for both 6,7Li projectiles improve the predictions to describe the measured quasi-elastic scattering excitation functions and barrier distributions. For both the reactions peak positions of fusion barrier distributions are shifted towards a lower energy side in comparison to that obtained from the fusion excitation function measurements. The observed discrepancy in peak positions of barrier distributions obtained from quasi-elastic scattering and fusion excitation function measurement...

Elastic scattering angular distributions using the weakly bound projectile 7Li on medium-mass target 116Sn were measured for 10 different beam energies from much below to above the Coulomb barrier. Optical model (OM) analysis was carried out using the famous double folding Sao Paulo Potential (SPP) to investigate the energy dependence of the interacting polarizing potentials. The absence of the usual Threshold Anomaly (TA) is observed. Thus this unusual behavior of the interacting potentials indicates the coupling of the breakup channels with the elastic ones.