THE β DECAY OF ~(81)Zn AND NUCLEAR STRUCTURE AROUND THE N=50 SHELL CLOSURE

摘要

The β-decay of the N=51 nucleus ~(81)Zn was studied by means of β-γ spectroscopy and from isotopically pure beams produced at the HRIBF. We observe several competing β transitions populating ~(81)Ga which are interpreted as allowed Gamow-Teller decays to positive parity, core excited states and first-forbidden decays to negative parity states. The measured β-decay pattern suggests an assignment of I~π=5/2~+ for the ~(81)Zn ground state.