Decay modes ofAr31and first observation of β-delayed three-proton radioactivity

Abstract
The different β-delayed particle-decay modes of Ar31 are investigated by means of a new silicon-detector telescope. Identification of β-delayed two-proton decay, and β-delayed three-proton decay observed for the first time, is made possible by Monte Carlo simulations of the detector response. Other β-delayed single-proton branches are also investigated, and none of the energetically allowed β-α and β-pα decay modes are found. Finally, the results of this experiment are compared to shell-model calculations.

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