STUDY OF BETA plus AND ELECTRON-CAPTURE DECAY OF SR-76 IN GAMMA-GAMMA COINCIDENCE MEASUREMENTS

The main goal of this work is to establish the nuclear decay scheme of 76Sr and energy levels of its doubly odd daughter nucleus 76Rb. The extremely neutron deficient nucleus 76Sr lying at the N = Z (= 38) line with half-life of 8.9 s was produced in spallation reactions of 600 MeV protons from the CERN Synchrocyclotron (SC) with a Nb multifoil target in conjunction with a W surface ionization source at the ISOLDE facility. The gamma-spectroscopy measurements have been performed with two Ge detectors which were positioned at about +/-30-degrees respectively downstream to the 76Sr beam. The obtained singles and coincidence gamma spectra were used to determine energies and intensities of gamma lines assigned to the decay of 76Sr and to establish some details of the nuclear level configuration of its daughter nucleus 76Rb up to 1000 keV.