$\beta$ decay of $^{69,70,71}$Kr

Proton-rich nuclei beyond the $N=Z$ line play a key role in our understanding of astrophysics, weak-interaction physics, and nuclear structure. The decay of $^{69}$Kr is of particular interest as it can be used to populate states in the proton unbound nucleus $^{69}$Br. During the $rp$-process, 2p-capture reactions through $^{69}$Br can bypass the ``waiting-point'' nucleus $^{68}$Se. This depends sensitively on the proton-capture Q-value. An implantation-decay experiment was recently conducted at GANIL which utilized $\beta$-p and $\beta$-$\gamma$ correlations to study physics related to the $\beta$ decay of $^{69,70,71}$Kr. Isotopes of Kr were implanted into a DSSD, also used to detect decay protons, located at the end of the LISE spectrometer. Coincident $\gamma$-rays from the implant decays were detected in the surrounding EXOGAM clovers. We were able to identify $\sim200$ $^{69}$Kr implantation-decay events, allowing us to extract the energy and constrain the angular momentum of the analog state in $^{69}$Br as well as improve the prediction for the $^{69}$Kr mass. An overview of the results from our analysis of $^{69}$Kr $\beta$ decay will be presented. This work is supported by the U.S. DOE Office of Nuclear Physics, Contract No.~DE-AC02-06CH11357.