Further evidence for shape coexistence in $^{79}$Zn$^{m}$ near doubly-magic $^{78}$Ni
| Autor: | 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., Alcindor, V. Girard, 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, Ch., Schweikhard, L., Vilen, M., Äystö, J. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Phys. Rev. Lett. 131, 222503 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevLett.131.222503 |
| Popis: | Isomers close to doubly-magic $^{78}_{28}$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 $^{79}_{30}$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 Non Orthogonal shell-model calculations which are used here 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 band-head 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. Comment: 10 pages, three figures, two tables. Accepted to Phys. Rev. Lett |
| Databáze: | arXiv |
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