Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB

Gray, T.  J.; Allmond, J.  M.; Xu, Z.; King, T.  T.; Lubna, R.  S.; Crawford, H.  L.; Tripathi, V.; Crider, B.  P.; Grzywacz, R.; Liddick, S.  N.; Macchiavelli, A.  O.; Miyagi, T.; Poves, A.; Andalib, A.; Argo, E.; Benetti, C.; Bhattacharya, S.; Campbell, C.  M.; Carpenter, M.  P.; Chan, J.; Chester, A.; Christie, J.; Clark, B.  R.; Cox, I.; Doetsch, A.  A.; Dopfer, J.; Duarte, J.  G.; Fallon, P.; Frotscher, A.; Gaballah, T.; Harke, J.  T.; Heideman, J.; Huegen, H.; Holt, J.  D.; Jain, R.; Kitamura, N.; Kolos, K.; Kondev, F.  G.; Laminack, A.; Longfellow, B.; Luitel, S.; Madurga, M.; Mahajan, R.; Mogannam, M.  J.; Morse, C.; Neupane, S.; Nowicki, A.; Ogunbeku, T.  H.; Ong, W. -J.; Porzio, C.; Prokop, C.  J.; Rasco, B.  C.; Ronning, E.  K.; Rubino, E.; Ruland, T.  J.; Rykaczewski, K.  P.; Schaedig, L.; Seweryniak, D.; Siegl, K.; Singh, M.; Stuchbery, A.  E.; Tabor, S.  L.; Tang, T.  L.; Wheeler, T.; Winger, J.  A.; Wood, J.  L.

doi:10.1103/physrevlett.130.242501

Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB

Journal Article · Tue Jun 13 00:00:00 EDT 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.130.242501· OSTI ID:1972470

; ; ; King, T. T.; ; ; ; Crider, B. P.; Grzywacz, R.; Liddick, S. N.; Macchiavelli, A. O.; ; Poves, A.; Andalib, A.; Argo, E.; ; Bhattacharya, S.; Campbell, C. M.; Carpenter, M. P.; Chan, J. more »

Excited-state spectroscopy from the first experiment at the Facility for Rare Isotope Beams (FRIB) is reported. A 24(2)-μs isomer was observed with the FRIB Decay Station initiator (FDSi) through a cascade of 224- and 401-keV γ rays in coincidence with ³²Na nuclei. This is the only known microsecond isomer (1 μs ≤T_1/2<1 ms) in the region. This nucleus is at the heart of the N=20 island of shape inversion and is at the crossroads of the spherical shell-model, deformed shell-model, and ab initio theories. It can be represented as the coupling of a proton hole and neutron particle to ³²Mg, ³²Mg+π^-1+ν⁺¹. This odd-odd coupling and isomer formation provides a sensitive measure of the underlying shape degrees of freedom of ³²Mg, where the onset of spherical-to-deformed shape inversion begins with a low-lying deformed 2⁺ state at 885 keV and a low-lying shape-coexisting 0$$^+_2$$ state at 1058 keV. Here, we suggest two possible explanations for the 625-keV isomer in ³²Na: a 6^- spherical shape isomer that decays by E2 or a 0⁺ deformed spin isomer that decays by M2. The present results and calculations are most consistent with the latter, indicating that the low-lying states are dominated by deformation.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: AC02-05CH11231; AC02-06CH11357; AC05-00OR22725; AC52-07NA27344; FG02-96ER40983; NA0003180; NA0003899; NA0003906; SC0012704; SC0014448; SC0020451

OSTI ID:: 1972470

Alternate ID(s):: OSTI ID: 1985384
OSTI ID: 1986613

Report Number(s):: BNL--224268-2023-JAAM; LLNL--JRNL-848401

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 130; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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