Elastic and inelastic scattering of 6Li and 7Li by 54Fe at E = 36–50 MeV

Abstract

Detailed angular distributions for the elastic and inelastic scattering of 7Li at E = 36, 42, and 48 MeV and of 6Li at E = 38, 44, and 50 MeV by 54Fe have been measured. It is not possible to describe both sets of data with the same set of optical-model parameters. The ratio of U W is 0.8 for 7Li and 1.4 for 6Li at the strong absorption radius, implying stronger absorption for 7Li than for 6Li. No energy dependence in the optical-model parameters was necessary for either 6Li or 7Li. The inelastic scattering from the 54Fe 2 +, 1.41 MeV state was well described by the DWBA and the extracted deformation length ( βR = 0.62) was the same for both 6Li and 7Li scattering. It was not possible to describe the 7Li projectile excitation data with collective-model DWBA calculations showing that more detailed calculations for the projectile excitation are necessary.