Probing the potential and reaction coupling effects ofLi6,7+Si28at sub- and near-barrier energies with elastic backscattering

Abstract

The excitation functions for $^{7}\mathrm{Li}+^{28}\mathrm{Si}$ quasielastic scattering at ${150}^{\ifmmode^\circ\else\textdegree\fi{}}$ and ${170}^{\ifmmode^\circ\else\textdegree\fi{}}$ have been measured at sub- and near-barrier energies (0.6 to 1.3 ${\mathrm{V}}_{\mathrm{B}}$) and the corresponding barrier distributions derived. The results were analyzed within the framework of the optical model using a procedure similar to one used on previous results for $^{6}\mathrm{Li}+^{28}\mathrm{Si}$ employing double-folded potentials calculated using the BDM3Y1 effective interaction. The variation of the surface strength of the optical potential as a function of incident energy was compared for the two systems $^{6}\mathrm{Li}+^{28}\mathrm{Si}$ and $^{7}\mathrm{Li}+^{28}\mathrm{Si}$, the barrier distributions being used to help better define the potential at the lowest energies. The barrier distributions were also analyzed with continuum-discretized coupled-channel (CDCC) and coupled reaction channel (CRC) calculations as a means of investigating the influence of breakup and transfer reactions on these quantities for these light, weakly bound projectiles.