A1 Journal article (refereed)
Further Evidence for Shape Coexistence in 79Znm near Doubly Magic 78Ni (2023)

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., . . . Äystö, J. (2023). Further Evidence for Shape Coexistence in 79Znm near Doubly Magic 78Ni. Physical Review Letters, 131, Article 222503. https://doi.org/10.1103/PhysRevLett.131.222503

JYU authors or editors

Canete, Laetitia
Kankainen, Anu
Stryjczyk, Marek
Eronen, Tommi
Jokinen, Ari
Moore, Iain
Mougeot, Maxime
Nesterenko, Dmitrii
Penttilä, Heikki
Pohjalainen, Ilkka
de Roubin, Antoine
Rubchenya, Valeri
Vilén, Markus
Äystö, Juha

Publication details

All authors or editors: Nies, L.; Canete, L.; Dao, D. D.; Giraud, S.; Kankainen, A.; Lunney, D.; Nowacki, F.; Bastin, B.; Stryjczyk, M.; Ascher, P.; et al.

Journal or series: Physical Review Letters

ISSN: 0031-9007

eISSN: 1079-7114

Publication year: 2023

Publication date: 30/11/2023

Volume: 131

Article number: 222503

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevLett.131.222503

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/92175

Abstract

Isomers close to doubly magic 78 28Ni50 provide essential information on the shell evolution and shape coexistence near the Z ¼ 28 and N ¼ 50 double shell closure. We report the excitation energy measurement of the 1=2þ isomer in 79 30Zn49 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=2þ isomer at 942(10) keV, slightly below the 5=2þ 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 ¼ 49 isotones. The 1=2þ isomer is interpreted as the bandhead of a low-lying deformed structure akin to a predicted low-lying deformed band in 80Zn, and points to shape coexistence in 79;80Zn similar to the one observed in 78Ni. The results make a strong case for confirming the claim of shape coexistence in this key region of the nuclear chart.

Keywords: nuclear physics

Fields of science: