Properties of Proton-Emitting ${}^{72,73}$Rb Isotopes

Properties of proton-emitting nuclei at the limits of nuclear binding, along the proton dripline, impact the rapid proton-capture ($rp$) process and can reveal interesting nuclear structure. $\beta$-delayed protons emitted from $^{73}$Sr, produced by the fragmentation of a $^{92}$Mo primary beam on a Be target, were measured via ion implantation-decay correlations at the NSCL using the Beta-Counting Station (BCS), providing a direct measurement of the $^{73}$Sr lifetime. Low-energy protons were observed that are consistent with transistions from $^{73}$Rb(g.s.) to $^{72}$Kr(g.s.), and the resulting proton separation energy of $^{73}$Rb was determined by a Bayesian analysis of the data. A substantial amount of $^{72}$Rb was also observed allowing for a limit to be placed on the fragmentation cross section.