beta-delayed charged-particle decay of 22,23Si

The ?? decay of 22,23Si by emission of delayed charged particles was investigated in an experiment at the Cyclotron Institute of Texas A&M University by means of an optical-readout time-projection chamber. The previously-known decay of the two isotopes by ??-delayed one- and two-proton emission was confirmed. For the first time, a new, rare, decay mode for 23Si, ??-delayed three-proton emission, was observed and ??-delayed proton-?? emission tentatively identified. Moreover, the ??-decay pattern for the ground state of 23Si was studied by means of multireference density-functional-rooted calculations.