Quasi‐elastic Scattering Measurements in the $6,7Li+144Sm$ Systems

In the present work, results of measurements of quasi‐elastic scattering cross sections using a silicon‐telescope detector at backward angles are reported. They allowed us to deduce fusion barrier distributions from the first derivative of the corresponding excitation function $(−d(dσqes/dσRut)/dE).$ We report data for the systems $6,7Li$ on $144Sm$ which are characterized by loosely bound projectiles onto a closed neutron shell target. The experimental excitation functions and the associated barrier distributions are compared for both systems.