Large back-angle quasielastic scattering for Li 7 + Tb 159

Quasielastic scattering excitation function at large backward angle has been measured for the weakly bound system $^{7}\mathrm{Li}+^{159}\mathrm{Tb}$ at energies around the Coulomb barrier. The corresponding quasielastic barrier distribution has been derived from the excitation function, both including and excluding the $\ensuremath{\alpha}$ particles produced in the reaction. The centroid of the barrier distribution obtained after inclusion of $\ensuremath{\alpha}$ particles was found to be shifted higher in energy, compared with the distribution excluding the $\ensuremath{\alpha}$ particles. The quasielastic data, excluding the $\ensuremath{\alpha}$ particles, have been analyzed in the framework of continuum discretized coupled-channels calculations. The quasielastic barrier distribution for $^{7}\mathrm{Li}+^{159}\mathrm{Tb}$, has also been compared with the fusion barrier distribution for the system.