Abstract
Beta-delayed two-proton decay is reported for the T z = − 5 2 isotopes 31Ar and 27S wnich were produced by fragmentation of 36Ar at 85 MeV/u. The two-proton nature of this decay is established on the basis of the number of events which trigger two detectors or more in a silicon-detector telescope. The proton energy spectra give experimental values for the daughter energy levels and for the branching ratios. The deduced values of the 31Ar and 27S masses are discussed and compared with mass predictions. For both nuclei, other channels like β3p and βpα are to be searched for since the observed β2p and βp branches do not fully account for the total decay width of the isobaric analog states in the daughter nuclei. Partial decay schemes are proposed for 31Ar and 27S.
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