Fast-timing study of Ga81 from the β decay of Zn81

V. Paziy et al.
Phys. Rev. C 102, 014329 – Published 30 July 2020

Abstract

The β decay of Zn81 to the neutron magic N=50 nucleus Ga81, with only three valence protons with respect to Ni78, was investigated. The study was performed at the ISOLDE facility at CERN by means of γ spectroscopy. The Zn81 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 γγ coincidences from the decay of Zn81 provides 47 new levels and 70 new transitions in Ga81. The βn decay of Zn81 was observed and a new decay scheme into the odd-odd Ga80 nucleus was established. The half-lives of the first and second excited states of Ga81 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 Ga81 is interpreted in terms of the coupling of the three valence protons outside the doubly magic Ni78 core.

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  • Received 11 March 2020
  • Revised 4 June 2020
  • Accepted 24 June 2020

DOI:https://doi.org/10.1103/PhysRevC.102.014329

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

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Vol. 102, Iss. 1 — July 2020

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