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Article
Report number	arXiv:2310.16915
Title	Further evidence for shape coexistence in $^{79}$Zn$^{m}$ near doubly-magic $^{78}$Ni
Related title	Further Evidence for Shape Coexistence in ${{}^{79}\mathrm{Zn}}^m$ near Doubly Magic ${}^{78}\mathrm{Ni}$
Author(s)	Nies, L. (CERN ; Greifswald U.) ; Canete, L. (Jyvaskyla U. ; Surrey U.) ; Dao, D.D. (Strasbourg, IPHC) ; Giraud, S. (GANIL) ; Kankainen, A. (Jyvaskyla U.) ; Lunney, D. (IJCLab, Orsay) ; Nowacki, F. (Strasbourg, IPHC) ; Bastin, B. (GANIL) ; Stryjczyk, M. (Jyvaskyla U.) ; Ascher, P. (LP2I, Bordeaux) ; Blaum, K. (Garching, Max Planck Inst.) ; Cakirli, R.B. (Istanbul U.) ; Eronen, T. (Jyvaskyla U.) ; Fischer, P. (Greifswald U.) ; Flayol, M. (LP2I, Bordeaux) ; Girard Alcindor, V. (GANIL) ; Herlert, A. (FAIR, Darmstadt) ; Jokinen, A. (Jyvaskyla U.) ; Khanam, A. (Jyvaskyla U. ; Aalto U. ; Helsinki U.) ; Köster, U. (CERN ; Laue-Langevin Inst.) ; Lange, D. (Garching, Max Planck Inst.) ; Moore, I.D. (Jyvaskyla U.) ; Müller, M. (Garching, Max Planck Inst.) ; Mougeot, M. (Jyvaskyla U. ; Garching, Max Planck Inst.) ; Nesterenko, D.A. (Jyvaskyla U.) ; Penttilä, H. (Jyvaskyla U.) ; Petrone, C. (Bucharest, IFIN-HH) ; Pohjalainen, I. (Jyvaskyla U.) ; de Roubin, A. (Jyvaskyla U.) ; Rubchenya, V. (Jyvaskyla U.) ; Schweiger, Ch. (Garching, Max Planck Inst.) ; Schweikhard, L. (Greifswald U.) ; Vilen, M. (Jyvaskyla U.) ; Äystö, J. (Jyvaskyla U.)
Publication	2023-11-30
Imprint	2023-10-25
Number of pages	10
Note	10 pages, three figures, two tables. Accepted to Phys. Rev. Lett
In:	Phys. Rev. Lett. Phys. Rev. Lett.
DOI	10.1103/PhysRevLett.131.222503 (publication) 10.1103/PhysRevLett.131.222503
Subject category	nucl-th ; Nuclear Physics - Theory ; nucl-ex ; Nuclear Physics - Experiment
Abstract	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.
Copyright/License	publication: Published by the American Physical Society (License: CC-BY-4.0) preprint: (License: CC BY 4.0)

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