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

An attempt to a consistent description of both ⁶Li and ¹¹Li scattering on ¹²C and ²⁸Si 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 ⁶Li-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 ¹¹Li+ ¹²C case. A simultaneous description of ¹¹Li+ ²⁸Si elastic and reaction cross sections requires a large renormalization of the optical model potential. At small angles, the magnitude and the phase of the ¹¹Li cross sections on both targets cannot be explained in terms of simple optical model amplitudes.