Abstract
Beta-delayed two-proton decays, observed in several nuclei along the proton dripline, have only been studied in detail in very few cases. We have studied the decay of 31Ar, as it was suspected that this nucleus has several β-2p branches with quite large branching ratios. We report here on two experiments done at ISOLDE-PSB (CERN) yielding to the most extensive investigation done so far on a β-delayed two-proton emitter. The analysis of the data have allow us to identify four β-2p branches connecting the IAS with ground and excited states in the two proton daughter 29P. About ten β-2p peaks have been assigned to decays from excited states in 31Cl at lower excitation energies than the IAS. In view of the energy and angular distribution of the individual protons the 2p-decay mechanisms are determined.
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