New cross-section and analyzing-power data are presented for elastic and inelastic scattering of 200-MeV protons from ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$, which has a ${\frac{3}{2}}^{-}$, $T=\frac{1}{2}$ ground state. A microscopic foldingmodel optical potential, obtained by convoluting a Pauli-corrected effective nucleon-nucleon ($\mathrm{NN}$) interaction with ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ 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 ${\mathrm{½}}^{-}$, $T=\frac{1}{2} \mathrm{and} {\frac{7}{2}}^{-}$, $T=\frac{1}{2}$ 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 $\mathrm{NN}$ 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 ${}_{}{}^6{}_{}{}^{}\mathrm{Li}$ and ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ radial densities and that the two inelastic transitions in ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$, which are primarily quadrupole in character, have $\frac{{\rho }_{2n}^m}{{\rho }_{2p}^m}\approx 0.9 \mathrm{and} 0.9-1.2$, respectively.

• Received 10 October 1990

DOI:https://doi.org/10.1103/PhysRevC.43.1664