Optical potential forLi6elastic scattering at 99 MeV

The differential cross section angular distributions for 99-MeV ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ elastic scattering from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$, ${}_{}{}^{40}{}_{}{}^{}\mathrm{Ca}$, ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$, ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$, and ${}_{}{}^{208}{}_{}{}^{}\mathrm{Pb}$ have been measured for center-of-mass angles up to ${\theta }_{max}=43\mathrm{}°-69\mathrm{}°$. The angular distributions show progressively less structure with increasing target mass which is characteristic of strongly absorbed particles. Phenomenological optical-model analyses with Woods-Saxon form factors exhibit both discrete and continuous ambiguities in the parameters which yield a good fit to the data. The $A$ dependence of several real central potential families and the effects of a surface absorption term have been investigated. A semimicroscopic single-folding ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ potential based on an ($\alpha +d$)- cluster model for ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ gave a good description of the data only after renormalization of the real potential by a factor of ∼0.5.