Excitation of High-Spin "Particle-Hole" States inSi28andMg24by Inelastic Proton Scattering at Large Momentum Transfer

High-spin "particle-hole" states in ${}_{}{}^{28}{}_{}{}^{}\mathrm{Si}$ [$E_x=14.350\mathrm{}$ MeV, $(J^{\pi }, T)=(6^{-}, 1)$; $E_x=12.656\mathrm{}$ MeV, ($4^{-}$, 1); $E_x=11.580\mathrm{}$ MeV, ($6^{-}$, 0] and in ${}_{}{}^{24}{}_{}{}^{}\mathrm{Mg}$ [$E_x=15.137\mathrm{}$ MeV, ($6^{-}$, 1)] are observed to be strongly excited by inelastic scattering of 135-MeV protons at momentum transfers of 200-450 MeV/c. Use of a new energy-independent pseudopotential in plane-wave impulse approximation explicitly including exchange provides good agreement with the data.