Zusammenfassung

The β− decay of 81Zn to the neutron magic N = 50 nucleus 81Ga, with only three valence protons with respect to 78Ni, was investigated. The study was performed at the ISOLDE facility at CERN by means of γ spectroscopy. The 81Zn half-life was determined to be T1/2 = 290(4) ms while the β-delayed neutron emission probability was measured as Pn = 23(4)%. The analysis of the β-gated γ -ray singles and γ -γ coincidences from the decay of 81Zn provides 47 new levels and 70 new transitions in 81Ga. The β−n decay of 81Zn was observed and a new decay scheme into the odd-odd 80Ga nucleus was established. The half-lives of the first and second excited states of 81Ga were measured via the fast-timing method using LaBr3(Ce) detectors. The level scheme and transition rates are compared to large-scale shell-model calculations. The low-lying structure of 81Ga is interpreted in terms of the coupling of the three valence protons outside the doubly magic 78Ni core.

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