Fusion and quasi-elastic scattering in theLi6,7+Au197systems
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Abstract
Fusion and quasi-elastic scattering measurements have been carried out for $^{6,7}\mathrm{Li}$+$^{197}\mathrm{Au}$ systems in the energy range $E/{V}_{b}\ensuremath{\sim}0.7$ to 1.5. Coupled-channel calculations including coupling to inelastic states of the target and projectiles are able to explain an enhancement in measured fusion cross sections at energies below the barrier. At energies above the barrier the complete fusion cross sections are found to be suppressed compared to the coupled-channel predictions for both systems. A systematic comparison of fusion cross sections of the weakly bound stable nuclei $^{6,7}\mathrm{Li}$ and halo nuclei $^{6,8}\mathrm{He}$ on a $^{197}\mathrm{Au}$ target is presented. Barrier distributions from quasi-elastic scattering are seen to shift towards higher energies with respect to fusion after inclusion of the breakup-$\ensuremath{\alpha}$ channel for both $^{6}\mathrm{Li}$ and $^{7}\mathrm{Li}$.
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