Quasielastic backscattering and barrier distributions for the6,7Li+64Znsystems

Abstract

Excitation functions of quasielastic scattering at backward angles were measured for the weakly bound ${}^{6}$Li and ${}^{7}$Li projectiles on a ${}^{64}$Zn target at energies around the Coulomb barrier. The corresponding barrier distributions were derived from the experimental cross sections. The experimental data were analyzed within the coupled-channel model using a double-folding potential as the bare potential. Inelastic excitations of the target, the ${}^{7}$Li first-excited state, and ${}^{6,7}$Li resonant state(s), corresponding to sequential breakup, were included in the calculations. The comparison between the data and coupled-channel predictions shows that the effects of channels not included in the calculations, such as direct breakup and transfers, are much larger for ${}^{6}$Li than for ${}^{7}$Li.