Neutron transition densities from 88Sr(p,p') at Ep=200 MeV.

Abstract

New cross section and analyzing power data for $^{88}\mathrm{Sr}$(p,p') at ${\mathit{E}}_{\mathit{p}}$=200 MeV are reported and analyzed together with earlier cross section data. Neutron transition densities for low-lying normal-parity excitations were extracted using an empirical density-dependent effective interaction and an expansion of the radial density which permits analysis of uncertainties due to penetrability, distortion, incompleteness, statistics, and normalization. The densities were compared with shell-model calculations using effective operators based upon a density-dependent Hartree-Fock approximation. Good agreement between theory and experiment is obtained for the ${2}_{1}^{+}$, ${3}_{1}^{\mathrm{\ensuremath{-}}}$, and ${5}_{1}^{\mathrm{\ensuremath{-}}}$ states, but the experimental neutron densities for the ${2}_{2}^{+}$ and ${7}_{1}^{\mathrm{\ensuremath{-}}}$ states are considerably stronger than expected. Both proton and neutron transition densities for the ${2}_{2}^{+}$ state have strong interior lobes, but the theory fails to reproduce the accompanying surface lobes.