Microscopic description of elastic scattering and reaction cross sections of Li-6 and Li-11

An attempt to a consistent description of both Li-6 and Li-11 scattering on C-12 and Si-28 is carried out in an optical model analysis. The optical potential results from a double folding calculation with G-matrix effective nucleon-nucleon interactions. With two renormalization parameters for the real and the imaginary parts of the potential, we describe the Li-6-scattering and extract the energy dependence of the multiplicative factors. The renormalization procedure provides a satisfactory description of the elastic and reaction cross section for the Li-11+ C-12 case. A simultaneous description of Li-11+Si-28 elastic and reaction cross sections requires a large renormalization of the optical model potential, At small angles, the magnitude and the phase of the Li-11 cross sections on both targets cannot be explained in terms of simple optical model amplitudes.