Precise mass measurement of the $^{32}$S member of the (A=32, T=2) quintet of analogue states
Résumé
This contribution presents a precise measurement of the excitation energy of the lowest (0$^{+}$, T=2) state in $^{32}$S. Combined with the mass excesses of the $^{32}$S ground state and of the four other members of the (A=32,T=2) quintet of analogue states, it allows to test the validity of the Isobaric Multiplet Mass Equation to the third order in T$_{z}$, which renders it highly sensitive to the mechanisms inducing isospin mixing in the involved sd-shell nuclei. The (0$^{+}$, T=2) isobaric analogue state in $^{32}$S was resonantly populated in the $^{31}$P(p, γ) reaction at ~3.3 MeV incident energy. The measurement procedure, involving high-purity germanium detectors, is described and the preliminary result obtained with a digital data acquisition system is presented.
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