Isovector and isoscalar spin-flip excitations in even-even s-d shell nuclei excited by inelastic proton scattering.

Abstract

Forward-angle cross sections for ${1}^{+}$ states have been measured in $^{24}$,26Mg, $^{28}\mathrm{Si}$, and $^{32}\mathrm{S}$ by 201 MeV proton inelastic scattering. Comparisons are made with (\ensuremath{\gamma},\ensuremath{\gamma}'), (e,e'), and (p,n) results. The measured strength is compared with microscopic distorted-wave Born approximation calculations using large-scale shell-model wave functions. Ratios of experimental to theoretical ${1}^{+}$ strengths are given. Almost no quenching is observed.