Search for1pNeutron Strength inS31by the ReactionS32(He3,α)S31

Levels of ${}_{}{}^{31}{}_{}{}^{}\mathrm{S}$ above $E_x=4.5\mathrm{}$ MeV have been studied with 18-MeV ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ ions via the neutron-pickup reaction ${}_{}{}^{32}{}_{}{}^{}\mathrm{S}({}_{}{}^3{}_{}{}^{}\mathrm{He},\alpha ){}_{}{}^{31}{}_{}{}^{}\mathrm{S}$. The $\alpha$ particles were detected by position-sensitive counters placed along the focal plane of the spectrograph. The experimental energy resolution was 13-18 keV full width at half maximum and permitted the resolution of some multiplets that previously had been interpreted as single states. Strongly structured angular distributions for nine well-resolved $\alpha$-particle groups were obtained over the angular range $7.5\le \theta \le 45°$. The $l$ values and spectroscopic factors for the transferred neutrons were extracted by comparison with distorted-wave calculations. The apparent absence of the bulk of the $1p$ neutron-pickup strength is discussed.