Precision Half-life Measurement of 33Cl

The understanding of fundamental symmetries has really been expanded in the past decade thanks to new precision measurements. In particular, the techniques used to extract the V$_{ud}$ matrix element from superallowed pure Fermi transitions could be tested using precise determinations of $ft$ values for superallowed mixed transitions between mirror nuclides. The calculations of $ft$ values require the half-life, branching ratio, and Q-value. The accepted $^{33}$Cl decay half-life arises from a series of old measurements. In this work, the life-time was determined counting $\beta$ particles from the decay of the implanted $^{33}$Cl. The $^{33}$Cl beam was produced via the $^{32}$S($d,n$) transfer reaction and separated by the TwinSol facility of the Nuclear Science Laboratory of the University of Notre Dame. The $^{33}$Cl data will be presented and the analysis will be discussed.