Further Evidence for Shape Coexistence in 79Znm near Doubly Magic 78Ni
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.
Main Authors
Format
Articles
Research article
Published
2023
Series
Subjects
Publication in research information system
Publisher
American Physical Society (APS)
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202312048173Use this for linking
Review status
Peer reviewed
ISSN
0031-9007
DOI
https://doi.org/10.1103/PhysRevLett.131.222503
Language
English
Published in
Physical Review Letters
Citation
- 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
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Funder(s)
European Commission
Research Council of Finland
Research Council of Finland
Research Council of Finland
Research Council of Finland
European Commission
Research Council of Finland
Funding program(s)
Research infrastructures, H2020
Research costs of Academy Research Fellow, AoF
Research costs of Academy Research Fellow, AoF
Academy Research Fellow, AoF
Research costs of Academy Research Fellow, AoF
ERC Consolidator Grant
Academy Research Fellow, AoF
Research infrastructures, H2020
Akatemiatutkijan tutkimuskulut, SA
Akatemiatutkijan tutkimuskulut, SA
Akatemiatutkija, SA
Akatemiatutkijan tutkimuskulut, SA
ERC Consolidator Grant
Akatemiatutkija, SA
Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Education and Culture Executive Agency (EACEA). Neither the European Union nor EACEA can be held responsible for them.
Additional information about funding
We thank the ISOLDE technical group and the ISOLDE Collaboration for their support. We acknowledge the support of the German Max Planck Society, the French Institut National de Physique Nucléaire et de Physique des Particules (IN2P3), the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant Agreements No. 682841 “ASTRUm,” 654002 “ENSAR2,” 101020842 “EUSTRONG,” and 771036 “MAIDEN”), as well as the German Federal Ministry of Education and Research (BMBF; Grants No. 05P18HGCIA, No. 05P21HGCI1, and No. 05P21RDFNB). L. N. acknowledges support from the Wolfgang Gentner Programme of the German Federal Ministry of Education and Research (Grant No. 13E18CHA). This work has been supported by the Academy of Finland under the Finnish Centre of Excellence Program (Nuclear and Accelerator Based Physics Research at JYFL 2012-2017), and under Academy of Finland Grants No. 275389, No. 284516, No. 312544, No. 295207, and No. 306980. We acknowledge the bilateral mobility grant from the Institut Français in Finland, the Embassy of France in Finland, the French Ministry of Higher Education and Research, and the Finnish Society of Science and Letters. We are grateful for the mobility support from PICS MITICANS (Manipulation of Ions in Traps and Ion sourCes for Atomic and Nuclear Spectroscopy). S. G. acknowledges the mobility grant from the EDPSIME. F. N and D. D. D. acknowledge the financial support of CNRS/IN2P3, France, via ABI-CONFI master projet. The JYFLTRAP experiment was conducted by L. C., S. G., A. K., B. B., P. A., T. E., V. G. A., A. J., A. K., I. D. M., D. A. N., F. D. O., H. P., C. P., I. P., A. D. R., V. R., M. V., and J. Ä. The ISOLTRAP experiment was conducted by L. N., R. B. C., P. F., M. F., A. H., D. La., M. Mü., M. M., Ch. S., and was conceived by U.K. The theoretical calculations were performed by D. D. D. and F. N. Funding and supervision were provided, in parts, by K. B. and L. S. The manuscript was prepared by L. N., D. D. D., A. K., D. Lu., F. N., and M. S. All authors contributed to the editing of the manuscript.
Copyright© Published by the American Physical Society, 2023