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

L. Canete; S. Giraud; A. Kankainen; B. Bastin; F. Nowacki; P. Ascher; T. Eronen; V. Girard Alcindor; A. Jokinen; A. Khanam; I. D. Moore; D. Nesterenko; F. De Oliveira; H. Penttilä; C. Petrone; I. Pohjalainen; A. De Roubin; V. Rubchenya; M. Vilen; J. Äystö

doi:10.1016/j.physletb.2024.138663

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

L. Canete^*, S. Giraud, A. Kankainen^*, B. Bastin, F. Nowacki, P. Ascher, T. Eronen, V. Girard Alcindor, A. Jokinen, A. Khanam, I. D. Moore, D. Nesterenko, F. De Oliveira, H. Penttilä, C. Petrone, I. Pohjalainen, A. De Roubin, V. Rubchenya, M. Vilen, J. Äystö

^*Corresponding author for this work

Department of Applied Physics

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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 E_x=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.

Original language	English
Article number	138663
Pages (from-to)	1-6
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	853
DOIs	https://doi.org/10.1016/j.physletb.2024.138663
Publication status	Published - Jun 2024
MoE publication type	A1 Journal article-refereed

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Long-sought isomer turns out to be the ground state of 76CuFinal published version, 1.17 MBLicence: CC BY

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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, Section B: Nuclear, Elementary Particle and High-Energy Physics, 853, 1-6. Article 138663. https://doi.org/10.1016/j.physletb.2024.138663

@article{9909bc86734a4c148bf21c5d4e0b8a29,

title = "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.",

author = "L. Canete and S. Giraud and A. Kankainen and B. Bastin and F. Nowacki and P. Ascher and T. Eronen and {Girard Alcindor}, V. and A. Jokinen and A. Khanam and Moore, {I. D.} and D. Nesterenko and {De Oliveira}, F. and H. Penttil{\"a} and C. Petrone and I. Pohjalainen and {De Roubin}, A. and V. Rubchenya and M. Vilen and J. {\"A}yst{\"o}",

note = "Publisher Copyright: {\textcopyright} 2024 The Author(s)",

year = "2024",

month = jun,

doi = "10.1016/j.physletb.2024.138663",

language = "English",

volume = "853",

pages = "1--6",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

}

Canete, L, Giraud, S, Kankainen, A, Bastin, B, Nowacki, F, Ascher, P, Eronen, T, Girard Alcindor, V, Jokinen, A, Khanam, A, Moore, ID, 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, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 853, 138663, pp. 1-6. https://doi.org/10.1016/j.physletb.2024.138663

TY - JOUR

T1 - Long-sought isomer turns out to be the ground state of 76Cu

AU - Canete, L.

AU - Giraud, S.

AU - Kankainen, A.

AU - Bastin, B.

AU - Nowacki, F.

AU - Ascher, P.

AU - Eronen, T.

AU - Girard Alcindor, V.

AU - Jokinen, A.

AU - Khanam, A.

AU - Moore, I. D.

AU - Nesterenko, D.

AU - De Oliveira, F.

AU - Penttilä, H.

AU - Petrone, C.

AU - Pohjalainen, I.

AU - De Roubin, A.

AU - Rubchenya, V.

AU - Vilen, M.

AU - Äystö, J.

PY - 2024/6

Y1 - 2024/6

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85191324567&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2024.138663

DO - 10.1016/j.physletb.2024.138663

M3 - Article

AN - SCOPUS:85191324567

SN - 0370-2693

VL - 853

SP - 1

EP - 6

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 138663

ER -

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

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