Long-sought isomer turns out to be the ground state of 76Cu

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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2024-06
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Language
en
Pages
6
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Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Volume 853, pp. 1-6
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.
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Publisher Copyright: © 2024 The Author(s)
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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 76 Cu ', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 853, 138663, pp. 1-6 . https://doi.org/10.1016/j.physletb.2024.138663