Elastic scattering and total reaction cross sections of ${}^6$Li studied with a microscopic continuum discretized coupled channels model

Abstract

We present a systematic study of ${}^6$Li elastic scattering and total reaction cross sections at incident energies around the Coulomb barrier within the continuum discretized coupled-channels (CDCC) framework, where ${}^6$Li is treated in an $\alpha$+$d$ two-body model. Collisions with ${}^{27}$Al, ${}^{64}$Zn, ${}^{138}$Ba and ${}^{208}$Pa are analyzed. The microscopic optical potentials (MOP) based on Skyrme nucleon-nucleon interaction for $\alpha$ and $d$ are adopted in CDCC calculations and satisfactory agreement with the experimental data is obtained without any adjustment on MOPs. For comparison, the $\alpha$ and $d$ global phenomenological optical potentials (GOP) are also used in CDCC analysis and a reduction no less than 50$\%$ on the surface imaginary part of deuteron GOP is required for describing the data. In all cases, the ${}^6$Li breakup effect is significant and provides repulsive correction to the folding model potential. The reduction on the surface imaginary part of GOP of deuteron reveals a strong suppression of the reaction probability of deuteron as a component of ${}^6$Li as compared with that of a free deuteron. A further investigation is made by taking the $d$ breakup process into account equivalently within the dynamic polarization potential approach and it shows that $d$ behaves like a tightly bound nucleus in ${}^6$Li induced reactions.

arXiv comment12 pages, 16 figures

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