Measurement of the $\beta$-asymmetry in the decay of magneto-optically trapped, spin-polarized $^{37}\mathrm{K}$

We have performed a measurement of the $\beta$-asymmetry parameter ($A_{\beta}$) in the isobaric-analogue $\frac{3}{2}^+\rightarrow\frac{3}{2}^+$ $\beta^+$ decay of $^{37}\mathrm{K}$ by observing the angular distribution of the decay positrons with respect to the nuclear polarization axis. The value of this parameter is sensitive to a possible ($V+A$) admixture in the weak interaction and is a sensitive probe of physics beyond the standard model. Atoms delivered from ISAC, the radioactive ion beam facility at TRIUMF, were cooled and confined in a magneto-optical trap, providing a localized source of atoms decaying nearly from rest. Furthermore, the decaying atoms were highly spin-polarized by optical pumping techniques and monitored by photoionization, with a preliminary analysis giving a nuclear polarization near 99\% with statistical uncertainty of 0.4\%. Here, I will present the current status of the analysis of our recent 2014 run, from which we have the statistics necessary for a $\la$ 0.5\% measurement.