$\beta$-Delayed Proton Emission of ${}^{71}$Kr

Mirror nuclei above $A\sim60$ play a key role in understanding the role of isospin in nuclear structure. The character of states in the $^{71}$Kr/$^{71}$Br mirror pair ($T=1/2$), that exhibit oblate-prolate shape coexistence, has been of significant interest for many years. Properties of this mirror system were investigated in an implant-decay experiment conducted at the NSCL using a beam containing $^{71}$Kr, produced by fragmentation of a $^{92}$Mo primary beam on a Be target and purified with the RF Fragment Separator, that was implanted into the Beta Counting Station surrounded by SeGA. $\beta$-decay branching to the lowest states of $^{71}$Br was observed as well as delayed-proton emission feeding the lowest states of $^{70}$Se. The results obtained from charged particle and $\gamma$-ray spectroscopy as well as implications for the structure of nuclei with $N \sim Z$ will be presented