We produced the lowest $T=2$ state in ${}^{32}\mathrm{S}$ with the ${}^{31}\mathrm{P}$($p,\gamma$) reaction and measured the energies of the deexcitation γ rays, obtaining an excitation energy of $12047.96\pm 0.28$ keV that disagrees with a previous value of $12045.0\pm 0.4$ keV. Our result, together with a recent measurement of the ${}^{32}\mathrm{Ar}$ mass, makes the $\text{A}=32$ multiplet the most precisely measured $T=2$ quintet and provides easily the most stringent test of the isobaric multiplet mass equation. A significant violation of the isobaric multiplet mass equation is observed that could be explained by mixing with a nearby $T=0$ level.

• Received 11 January 2006

DOI:https://doi.org/10.1103/PhysRevC.73.054313