Elastic Scattering and Total Reaction Cross Sections of 6li Examined Via a Microscopic Continuum Discretized Coupled-Channels Model*

We present a systematic study of Li-6 elastic scattering and total reaction cross sections at incident energies around the Coulomb barrier within the continuum discretized coupled-channels (CDCC) framework, where Li-6 is treated in an alpha+d two-body model. Collisions with Al-27, Zn-64, Ba-138, and Pa-208 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, alpha and d global phenomenological optical potentials (GOP) are also used in CDCC analysis and a reduction of no less than 50% on the surface imaginary part of deuteron GOP is required for describing the data. In all cases, the Li-6 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 Li-6 when compared with that of a free deuteron. Further investigation is performed by considering the d breakup process equivalently within the dynamic polarization potential approach, and the results show that d behaves in a manner similar to a tightly bound nucleus in Li-6 induced reactions.