Fast-timing study of \(^{81}\)Ga from the \(\beta\) decay of \(^{81}\)Zn

• Published in: arXiv.org
• Main Authors: Paziy, V, Fraile, L M, Mach, H, Olaizola, B, Simpson, G S, Aprahamian, A, Bernards, C, Briz, J A, Bucher, B, Chiara, C J, Dlouhý, Z, Gheorghe, I, Ghiţǎ, D, Hoff, P, Jolie, J, Köster, U, Kurcewicz, W, Licǎ, R, Mǎrginean, N, Mǎrginean, R, J -M Régis, Rudigier, M, Sava, T, Stǎnoiu, M, Stroe, L, Walters, W B
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 26.06.2020
• Subjects: Beta decay; Beta rays; Emission analysis; Gamma rays; Half-life; Neutron emission; Neutrons; Nuclei (nuclear physics); Protons
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2006.15095

The \(\beta^{-}\) decay of \(^{81}\)Zn to the neutron magic \(N=50\) nucleus \(^{81}\)Ga, with only three valence protons with respect to \(^{78}\)Ni, was investigated. The study was performed at the ISOLDE facility at CERN by means of \(\gamma\) spectroscopy. The \(^{81}\)Zn half-life was determined to be \(T_{1/2}=290(4)\) ms while the \(\beta\)-delayed neutron emission probability was measured as \(P_n=23(4)\%\). The analysis of the \(\beta\)-gated \(\gamma\)-ray singles and \(\gamma\)-\(\gamma\) coincidences from the decay of \(^{81}\)Zn provides 47 new levels and 70 new transitions in \(^{81}\)Ga. The $\beta^-$$n\( decay of \)^{81}\(Zn was observed and a new decay scheme into the odd-odd \)^{80}\(Ga nucleus was established. The half-lives of the first and second excited states of \)^{81}\(Ga were measured via the fast-timing method using LaBr\)_3\((Ce) detectors. The level scheme and transition rates are compared to large-scale shell-model calculations. The low-lying structure of \)^{81}\(Ga is interpreted in terms of the coupling of the three valence protons outside the doubly-magic \)^{78}$Ni core.