Details

Autor(en) / Beteiligte

• 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, Ch
• Schweikhard, L
• Vilen, M
• Äystö, J

Titel

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

Ist Teil von

• Physical review letters, 2023-12, Vol.131 (22), p.222503-222503

Ort / Verlag

United States

Erscheinungsjahr

2023

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• 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.