Studies of β-delayed proton decays of N≃Z nuclei around 100Sn at the GSI-ISOL facility

Beta decays of Ag-94,Ag-96 and Sn-103 nuclei into proton channels have been studied in the recent experiments at the GSI-ISOL facility. New efficient and chemically selective ion sources provided the highest yields of light silver and tin isotopes. Large arrays of germanium gamma-ray and silicon charged-particle detectors, as well as a total absorption spectrometer (TAS) were used to measure beta-proton, proton-gamma, beta-proton-gamma and proton-gamma-gamma spectra. For the decay of Ag-94, we observed high-spin states in Rh-93 populated by proton emission following 0 decay, whose largest spin value (greater than or equal to39/2) yields an experimental proof for the existence of a second high-spin isomer in 94Ag with Igreater than or equal to17. Its beta-decay energy is at least 16.8 MeV, corresponding to an excitation energy greater than or equal to5.5 MeV. For Sn-103, the gamma rays measured in coincidence with beta-delayed protons allowed us to establish the beta-decay properties of this isotope. In particular, a Q(EC) value of 7.5(6) MeV is derived from the intensity ratio of protons that are preceded either by EC or by beta(+) decays and populate the 2+ state in Cd-102.