New cross-section and analyzing-power data are presented for elastic and inelastic scattering of 200-MeV protons from Li7, which has a 32-, T=12 ground state. A microscopic foldingmodel optical potential, obtained by convoluting a Pauli-corrected effective nucleon-nucleon (NN) interaction with Li7 ground-state densities constrained by weak and electromagnetic data, produces a satisfactory description of the elastic data. The effects of the nonspherical terms in the optical potential, estimated via the distorted-wave approximation (DWA), are appreciable. The inelastic transitions leading to the T=12 and 72-, T=12 states at 0.48 and 4.63 MeV, respectively, are also examined within the framework of the microscopic folding model and the DWA. Transition potentials are generated by convoluting the effective NN interaction considered with target transition densities constrained by weak, electromagnetic, and low-energy proton and neutron scattering data. These potentials are employed in DWA calculations along with the folded optical potential that is consistent with the transition potentials. These self-consistent calculations also provide a good description of the inelastic data. The results provide a clear indication that there are important shape differences between the Li6 and Li7 radial densities and that the two inelastic transitions in Li7, which are primarily quadrupole in character, have 2nm2pm0.9 and 0.9-1.2, respectively.
ASJC Scopus subject areas
- Nuclear and High Energy Physics