Projectile excitation and structure effects in 6Li and 7Li scattering

Abstract

Polarized 6, 7Li scattering from 58Ni at E c.m. = 13–20 MeV is investigated by coupled-channels calculations including projectile excitation channels. Potentials are obtained by a single-folding procedure assuming an α+d(t) cluster structure for the projectile. All the available data are reproduced by the calculations. Projectile excitation is found to be the dominant effect in the vector analysing power ( iT 11) for elastic scattering. These effects are in the opposite directions for 6Li and 7Li and explain the opposite signs of the measured iT 11 in the two scatterings. The folding-model tensor potential, which is sensitive to the deformation of the projectile, is mainly responsible for the behaviour of the elastic-scattering tensor analysing power. The cluster-model wave functions used in the folding procedure reproduce the measured Q-moments. The Q-moments of both Li isotopes are negative, but the measured tensor analysing powers ( T T 20 have opposite signs. This can be understood in terms of the different surface structure of 6Li and 7Li. Results and discussions for inelastic scattering and for other scattering systems are also given.