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

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 (γ,γ’), (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.