Precision Measurements in $^{37}$K

We have performed precision measurements of the kinematics of the daughter particles in the decay of $^{37}$K. This isotope decays by $\beta^+$ emission in a mixed Fermi/Gamow-Teller transition to its isobaric analog, $^{37}$Ar. Because the higher-order standard model corrections to this decay process are well understood, it is an ideal candidate for for improving constraints on interactions beyond the standard model. Our setup utilizes a magneto-optical trap to confine and cool samples of $^{37}$K, which are then spin-polarized by optical pumping. This allows us to perform measurements on both polarized and unpolarized nuclei, which is valuable for a complete understanding of systematic effects. Precision measurements of this decay are expected to be sensitive to the presence of right-handed vector currents, as well as a linear combination of scalar and tensor currents. Progress towards a final result is presented here.