High spin states inSi28andNi58

Proton inelastic cross sections have been measured for the $5^{-}$ and $6^{-}$ ($T=0, 1$) states of ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ and the $6^{+}$ state of ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$ at $E_{\mathrm{p}}=333, 498, \mathrm{and} 800$ MeV. These data, and previously published data at $E_{\mathrm{p}}=135\mathrm{} \mathrm{and} 178$ MeV, are analyzed in the context of the distorted wave impulse approximation. The transition densities obtained from the proton scattering analysis are compared with those we obtain from fitting the corresponding electron scattering form factors in an attempt to evaluate the validity of the distorted wave impulse approximation at high momentum transfer over the range $E_{\mathrm{p}}=135-800\mathrm{}$ MeV. The proton and electron values of theoretical normalization factors are in reasonable agreement with each other for the unnatural parity states but are in agreement only at the highest proton energies for the natural parity states.