$^{30,31}$S level structure measured via ($p,t$) and ($p,d$) reactions on $^{32}$S

An accurate knowledge of the level structure of $^{30,31}$S above the proton threshold is important for calculating the astrophysical rates of proton capture on $^{29,30}$P respectively. These proton captures affect the Si abundances observed in meteoritic presolar grains and the reaction flow to heavier nulcei in novae. We have studied $^{30,31}$S by bombarding ZnS targets with $\sim$40-MeV proton beams from the Holifield Radioactive Ion Beam Facility and detecting reaction tritons and deuterons in the Silicon Detector Array (SIDAR). A total of 13(26) states were observed in $^{30}$S($^{31}$S) including 9(17) above the proton threshold. The spins of strongly-populated levels were constrained through a DWBA analysis of the measured angular distributions. The method and results will be presented.