The different β-delayed particle-decay modes of ${}_{}{}^{31}{}_{}{}^{}\mathrm{Ar}$ 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.

• Received 10 June 1991

DOI:https://doi.org/10.1103/PhysRevC.45.69