Further Evidence for Shape Coexistence in ^{79}Zn^{m} near Doubly Magic ^{78}Ni

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2023-12-01
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en
Pages
7
1-7
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Physical Review Letters, Volume 131, issue 22
Abstract
Isomers close to doubly magic _{28}^{78}Ni_{50} provide essential information on the shell evolution and shape coexistence near the Z=28 and N=50 double shell closure. We report the excitation energy measurement of the 1/2^{+} isomer in _{30}^{79}Zn_{49} through independent high-precision mass measurements with the JYFLTRAP double Penning trap and with the ISOLTRAP multi-reflection time-of-flight mass spectrometer. We unambiguously place the 1/2^{+} isomer at 942(10) keV, slightly below the 5/2^{+} state at 983(3) keV. With the use of state-of-the-art shell-model diagonalizations, complemented with discrete nonorthogonal shell-model calculations which are used here for the first time to interpret shape coexistence, we find low-lying deformed intruder states, similar to other N=49 isotones. The 1/2^{+} isomer is interpreted as the bandhead of a low-lying deformed structure akin to a predicted low-lying deformed band in ^{80}Zn, and points to shape coexistence in ^{79,80}Zn similar to the one observed in ^{78}Ni. The results make a strong case for confirming the claim of shape coexistence in this key region of the nuclear chart.
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Nies, L, Canete, L, Dao, D D, Giraud, S, Kankainen, A, Lunney, D, Nowacki, F, Bastin, B, Stryjczyk, M, Ascher, P, Blaum, K, Cakirli, R B, Eronen, T, Fischer, P, Flayol, M, Girard Alcindor, V, Herlert, A, Jokinen, A, Khanam, A, Köster, U, Lange, D, Moore, I D, Müller, M, Mougeot, M, Nesterenko, D A, Penttilä, H, Petrone, C, Pohjalainen, I, de Roubin, A, Rubchenya, V, Schweiger, C, Schweikhard, L, Vilen, M & Äystö, J 2023, ' Further Evidence for Shape Coexistence in ^{79}Zn^{m} near Doubly Magic ^{78}Ni ', Physical Review Letters, vol. 131, no. 22, 222503, pp. 1-7 . https://doi.org/10.1103/PhysRevLett.131.222503