$^{31}{\rm P}(p,\gamma)$ and the isobaric multiplet mass equation

We present results of a recent $^{31}{\rm P}(p,\gamma)$ experiment to test the isobaric multiplet mass equation (IMME). The energies of the de-excitation $\gamma$ rays were measured with high precision to obtain the excitation energy of lowest $T=2$ state of $^{32}{\rm S}$. Our result, together with a recent measurement of the $^{32}\rm Ar$ mass, makes the $A = 32$ multiplet the most precisely measured $T=2$ quintet provides the most stringent test of the isobaric multiplet mass equation.