Long-sought isomer turns out to be the ground state of 76Cu
Abstract
Isomers close to the doubly magic nucleus 78Ni (Z = 28, N = 50) provide essential information on the shell evolution and shape coexistence far from stability. The existence of a long-lived isomeric state in 76Cu has been debated for a long time. We have performed high-precision mass measurements of 76Cu with the JYFLTRAP double Penning trap mass spectrometer at the Ion Guide Isotope Separator On-Line facility and confirm the existence of such an isomeric state with an excitation energy Ex = 64.8(25) keV. Based on the ratio of detected ground- and isomeric-state ions as a function of time, we show that the isomer is the shorter-living state previously considered as the ground state of 76Cu. The result can potentially change the conclusions made in previous works related to the spin-parity and charge radius of the 76Cu ground state. Additionally, the new 76Cu(n, γ) reaction Q-value has an impact on the astrophysical rapid neutron-capture process.
Main Authors
Format
Articles
Research article
Published
2024
Series
Subjects
Publication in research information system
Publisher
Elsevier
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202412197905Use this for linking
Review status
Peer reviewed
ISSN
0370-2693
DOI
https://doi.org/10.1016/j.physletb.2024.138663
Language
English
Published in
Physics Letters B
Citation
- Canete, L., Giraud, S., Kankainen, A., Bastin, B., Nowacki, F., Ascher, P., Eronen, T., Girard Alcindor, V., Jokinen, A., Khanam, A., Moore, I. D., Nesterenko, D., De Oliveira, F., Penttilä, H., Petrone, C., Pohjalainen, I., De Roubin, A., Rubchenya, V., Vilen, M., & Äystö, J. (2024). Long-sought isomer turns out to be the ground state of 76Cu. Physics Letters B, 853, Article 138663. https://doi.org/10.1016/j.physletb.2024.138663
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Funder(s)
Research Council of Finland
Research Council of Finland
Research Council of Finland
Research Council of Finland
Research Council of Finland
European Commission
European Commission
Funding program(s)
Academy Research Fellow, AoF
Academy Research Fellow, AoF
Research costs of Academy Research Fellow, AoF
Research costs of Academy Research Fellow, AoF
Research costs of Academy Research Fellow, AoF
Research infrastructures, H2020
ERC Consolidator Grant
Akatemiatutkija, SA
Akatemiatutkija, SA
Akatemiatutkijan tutkimuskulut, SA
Akatemiatutkijan tutkimuskulut, SA
Akatemiatutkijan tutkimuskulut, SA
Research infrastructures, H2020
ERC Consolidator Grant
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
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 by the European Unions Horizon 2020 research and innovation programme grant agreement No 654002 (ENSAR2). A.K. acknowledges the support from the Academy of Finland under grant No. 275389 and D.N. and L.C. under grants No. 284516 and 312544. T.E. acknowledges the support from the Academy of Finland under grant No. 295207 and A.R. under grant No. 306980. A.K. and L.C. acknowledge the funding from the European Union's Horizon 2020 research and innovation program under grant agreement No. 771036 (ERC CoG MAIDEN). We thank for 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. thanks for the mobility grant from the EDPSIME.
Copyright© 2024 The Author(s). Published by Elsevier B.V. Funded by SCOAP³.