Zr90(p, p′)Zr*90Reaction at 40 MeV

Differential cross sections for the excitation of the $0^{+}$ (1.75-MeV), $2^{+}$ (2.18-MeV), $5^{-}$ (2.32-MeV), $4^{+}$ (3.08-MeV), $6^{+}$ (3.45-MeV), $8^{+}$ (3.60-MeV), and the $2^{+}$ (3.31-MeV) levels in ${}_{}{}^{90}{}_{}{}^{}\mathrm{Zr}$ by 40-MeV protons have been measured between 15° and 115°. The data are compared with the results of distorted-wave (DWA) collective-model calculations and DWA microscopic-model calculations. Both macroscopic and microscopic treatments of core polarization are considered. Effects from noncentral components in the projectile-target interaction have been investigated and an imaginary central component has been included in this interaction in the cases where a completely microscopic model is used for the target nucleus. A coupled-channels calculation has been performed in order to investigate multiple excitation contributions to the cross section for the $0^{+}$ (1.75-Mev) state.