Time, Parity, and Isospin symmetry tests with TRIUMF's neutral atom trap for beta decay (TRINAT)

We have laser-trapped about 1,000 atoms of ⁴⁷K and ³⁷K and measured beta decay observables. The asymmetry of the recoiling nuclei with respect to the nuclear spin vanishes in pure Gamow-Teller decay, so its measurement is sensitive to isospin-breaking Fermi decay (in ⁴⁷K) or several standard model tests reflecting Gamow-Teller/Fermi interference (³⁷K). The isospin-hindered beta decay of ⁴⁷K projects competitive sensitivity to isospin-breaking, parity-even, time-reversal odd interactions in the progeny ⁴⁷Ca nucleus. This poster will detail the precision polarization and detection methods, show published results [B. Kootte et al. PRC Lett 2024] and future plans in ⁴⁷K, and preliminary results of our group in ³⁷K decay.