Decay studies of the neutron deficient $^{33}$Ar and $^{32}$Ar revisited
Résumé
Beta delayed particle emission is a powerfull tool to study nuclear structure near the drip-line. This is due to the combination of several factors. Near the drip line, the large difference in isobaric masses and the low binding energy for the last nucleon open up a large $Q_$\beta$-window for particle emission. The high efficiency in the detection of the emitted particles, only limited by the solid angle, allows to determine the excited structure of the daughter nucleus if the final state is known, even for very rare species. This method has been applied in the last four decades to about two hundred nuclei known to be $\beta$-delayed proton emitters. In a recent experiment done at the low energy line branch, IBE, of SPIRAL in GANIL (Caen, France) the lighter argon isotopes were studied. The experimental setup consisted of 6 DSSSD (Double Side Silicon Stripped Detectors) placed in a cubic geometry with the stopper foil in the center.Each DSSSD was backed by a silicon detector to detect high energy charged particles and betas. The cube was surrounded by 3 small EXOGAM clovers detectors. Although detailed studies have been done of the decay of these light argon isotopes previously, we have decided to revisit these decays with the aim of exploring with high sensitivy the $\beta$-3p branch and search for correlated p-p emission in 31Ar as well as possible 2p branch in 32Ar. We are also interested in the study of the interplay of the proton and gamma partial branches in the levels close to the particle threshold for the three proton-emitters: 31-33Ar. Furthermore the high granularity of the set-up will allow to do particle-particle correlations to settle the spin of the excited states in the daughter nucleus. In this contribution we will present the results obtained for 32Ar and 33Ar decays.