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

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.

Physics letters. B, 2024-06, Vol.853, p.138663, Article 138663 [Periódico revisado por pares]

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Título:
Long-sought isomer turns out to be the ground state of 76Cu
Autor: 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.
É parte de: Physics letters. B, 2024-06, Vol.853, p.138663, Article 138663
Descrição: 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.
Editor: Elsevier B.V
Idioma: Inglês

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