β -delayed proton emission from P 26 and S 27

Delayed emission of protonsfollowing β decay of neutron deficient nuclei P26 and S27 was investigated at the ACCULINNA separator in the Flerov Laboratory of Nuclear Reactionsat Dubna. Ions of interest, identified in flight, were implanted into the active volume of the gaseous optical time projection chamber, which allowed us to record tracks of charged particles emitted in the decay. Total branching ratios for β-delayed proton emissionand for β-delayed two- proton emissionwere determined. In addition, energy spectra for delayed protonsbelow 2 MeV were established. Our findings for P26 agree with results of previous experiments. In the case of S27, however, the observed probability of delayed proton emissionis an order of magnitude larger than reported in literature. Two new strong protontransitions were identified representing decays of the first two excited states of P27 to the ground state of Si26. The probability ratio of γ-to- proton emissionfrom these states is discussed.