Identification of a new isomeric state in 76Zn following the β decay of 76Cu

Chester, A.; Brown, B. A.; Burcher, S. P.; Carpenter, M. P.; Carroll, J. J.; Chiara, C. J.; Copp, P. A.; Crider, B. P.; Harke, J. T.; Hoff, D. E. M.; Kolos, K.; Liddick, S. N.; Longfellow, B.; Mogannam, M. J.; Ogunbeku, T. H.; Prokop, C. J.; Rhodes, D.; Richard, A. L.; Shehu, O. A.; Tamashiro, A. S.; Unz, R.; Xiao, Y.

doi:10.1103/physrevc.104.054314

Title: Identification of a new isomeric state in ⁷⁶Zn following the β decay of ⁷⁶Cu

Journal Article · 24 November 2021 · Physical Review C

DOI: https://doi.org/10.1103/physrevc.104.054314 · OSTI ID:1834497

Chester, A. ^[1];

^[1]; Burcher, S. P. ^[2];

^[3];

^[4];

^[4]; Copp, P. A. ^[3];

^[5];

^[2]; Hoff, D. E. M. ^[2];

^[2]; Liddick, S. N. ^[1]; Longfellow, B. ^[6];

^[1]; Ogunbeku, T. H. ^[5]; Prokop, C. J. ^[7]; Rhodes, D. ^[1]; Richard, A. L. ^[6]; Shehu, O. A. ^[5]; Tamashiro, A. S. ^[8] more »

Michigan State Univ., East Lansing, MI (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Army Research Lab., Adelphi, MD (United States)
Mississippi State Univ., Mississippi State, MS (United States)
Michigan State Univ., East Lansing, MI (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Oregon State Univ., Corvallis, OR (United States)
Michigan State Univ., East Lansing, MI (United States); Mississippi State Univ., Mississippi State, MS (United States); Univ. of Kentucky, Lexington, KY (United States)

Background: The evolution of nuclear shell structure far from stability can be explored by identifying and measuring the properties of isomers. Neutron-rich nuclei between the Z = 28 and Z = 50 closed shells have been the subject of recent studies which have identified a number of 0.1 - 10 µs isomers and measured detailed spectroscopic properties. Purpose: The purpose of this analysis was to identify and measure the properties of short-lived isomeric states populated following β decay in Z ≈ 30, N ≈ 50 nuclei near the doubly magic nucleus ⁷⁸Ni. Methods: Here, radioactive ions produced by beam fragmentation at the National Superconducting Cyclotron Laboratory were implanted into a CeBr₃ scintillator coupled to a pixelated photomultiplier tube. Ancillary arrays of HPGe clover and LaBr₃ detectors were positioned around the implantation detector to measure β-delayed γ rays. Results: The previously observed 2634-keV level in ⁷⁶Zn, populated following the β decay of ⁷⁶Cu, was identified as isomeric with a half-life of 25.4(4) ns. A combination of timing and γ-ray spectroscopy was used to confirm this assignment. Shell-model calculations were performed and indicate that this state may be a high-spin negativeparity state formed by the occupation of the ν0g_9/2 orbital. Conclusions: A new isomeric state in ⁷⁶Zn has been identified and its half-life was measured. Ambiguity about the structure of this state could be resolved with further experiments.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF)

Grant/Contract Number:: AC52-07NA27344; NA0003906; NA0003180; SC0020451; AC02-06CH11357

OSTI ID:: 1834497

Report Number(s):: LLNL-JRNL--823738; 1036234

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 104; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Identification of a new isomeric state in 76Zn following the β decay of 76Cu

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Title: Identification of a new isomeric state in ⁷⁶Zn following the β decay of ⁷⁶Cu