Study of ${\mathrm{\beta }}^{+}$ and electron capture decay of ${}_{}{}^{76}{}_{}{}^{}\mathrm{Sr}$ in γ-γ coincidence measurements

The main goal of this work is to establish the nuclear decay scheme of ${}_{}{}^{76}{}_{}{}^{}\mathrm{Sr}$ and energy levels of its doubly odd daughter nucleus ${}_{}{}^{76}{}_{}{}^{}\mathrm{Rb}$. The extremely neutron deficient nucleus ${}_{}{}^{76}{}_{}{}^{}\mathrm{Sr}$ 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 γ-spectroscopy measurements have been performed with two Ge detectors which were positioned at about ±30° respectively downstream to the ${}_{}{}^{76}{}_{}{}^{}\mathrm{Sr}$ beam. The obtained singles and coincidence γ spectra were used to determine energies and intensities of γ lines assigned to the decay of ${}_{}{}^{76}{}_{}{}^{}\mathrm{Sr}$ and to establish some details of the nuclear level configuration of its daughter nucleus ${}_{}{}^{76}{}_{}{}^{}\mathrm{Rb}$ up to 1000 keV.