Mass of the lowest $T=2$ level in $^{32}$Cl
ORAL
Abstract
The mass of $^{31}$S has been measured to better than 0.5 keV/ $c^2$ using the Canadian Penning Trap mass spectrometer at Argonne National Laboratory's ATLAS facility. The result changes the mass of the lowest $T=2$ level in $^{32}$Cl substantially and improves its precision by roughly a factor of three. The new $Q_{EC}$ value for the superallowed $\beta$ decay of $^{32}$Ar to this level affects constraints on scalar currents via the $\beta-\nu$ correlation and the isospin-symmetry-breaking correction ($\delta_C$) to the $ft$ value for this decay. The quadratic isobaric multiplet mass equation (IMME) is found to fail for the lowest $T=2$, $A=32$ isobaric quintet with higher confidence than for any other isobaric multiplet; the cubic fit is excellent.
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