The β decay of the N=51 nucleus 81Zn was studied by means of β-γ spectroscopy and from isotopically pure beams produced at the Holifield Radioactive Ion Beam Facility (HRIBF). We observe several competing β transitions populating 81Ga that 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 of Ip=5/2+ for the 81Zn ground state. The systematics of core excited states in N=50 isotones indicate a strengthening of the N=40 subshell gap near 78Ni.
The β decay of 81Zn and migrations of states observed near the N=50 closed shell / S. Padgett, M. Madurga, R. Grzywacz, I. G. Darby, S. N. Liddick, S. Paulauskas, C. J. Gross, K. Rykaczewski, D. Shapira, D. W. Stracener, A. J. Mendez II, J. Winger, S. Ilyushkin, A. Korgul, W. Krolas, E. Zganjar, C. Mazzocchi, M. M. Rajabali. - In: PHYSICAL REVIEW. C, NUCLEAR PHYSICS. - ISSN 0556-2813. - 82:6(2010), pp. 064314.064314.1-064314.064314.9.
The β decay of 81Zn and migrations of states observed near the N=50 closed shell
C. MazzocchiPenultimo
;
2010
Abstract
The β decay of the N=51 nucleus 81Zn was studied by means of β-γ spectroscopy and from isotopically pure beams produced at the Holifield Radioactive Ion Beam Facility (HRIBF). We observe several competing β transitions populating 81Ga that 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 of Ip=5/2+ for the 81Zn ground state. The systematics of core excited states in N=50 isotones indicate a strengthening of the N=40 subshell gap near 78Ni.
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