Proton Shell Gaps in N=28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator

Cox, I.; Xu, Z.  Y.; Grzywacz, R.; Ong, W. -J.; Rasco, B.  C.; Kitamura, N.; Hoskins, D.; Neupane, S.; Ruland, T.  J.; Allmond, J.  M.; King, T.  T.; Lubna, R.  S.; Rykaczewski, K.  P.; Schatz, H.; Sherrill, B.  M.; Tarasov, O.  B.; Ayangeakaa, A.  D.; Berg, H.  C.; Bleuel, D.  L.; Cerizza, G.; Christie, J.; Chester, A.; Davis, J.; Dembski, C.; Doetsch, A.  A.; Duarte, J.  G.; Estrade, A.; Fijałkowska, A.; Gray, T.  J.; Good, E.  C.; Haak, K.; Hanai, S.; Harke, J.  T.; Harris, C.; Hermansen, K.; Hoff, D.  E. M.; Jain, R.; Karny, M.; Kolos, K.; Laminack, A.; Liddick, S.  N.; Longfellow, B.; Lyons, S.; Madurga, M.; Mogannam, M.  J.; Nowicki, A.; Ogunbeku, T.  H.; Owens-Fryar, G.; Rajabali, M.  M.; Richard, A.  L.; Ronning, E.  K.; Rose, G.  E.; Siegl, K.; Singh, M.; Spyrou, A.; Sweet, A.; Tsantiri, A.; Walters, W.  B.; Yokoyama, R.

doi:10.1103/physrevlett.132.152503

Title: Proton Shell Gaps in N = 28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator

Journal Article · 11 April 2024 · Physical Review Letters

DOI: https://doi.org/10.1103/physrevlett.132.152503 · OSTI ID:2337957

^[1];

;

; Kitamura, N.; Hoskins, D.; Neupane, S.; Ruland, T. J.;

;

; Lubna, R. S.;

; Schatz, H.; Sherrill, B. M.; Tarasov, O. B.; Ayangeakaa, A. D.;

; Bleuel, D. L.; Cerizza, G. more »

University of Tennessee

The first complete measurement of the $$β$$-decay strength distribution of $$_{17}^{45}$$Cl₂₈ was performed at the Facility for Rare Isotope Beams (FRIB) with the FRIB Decay Station Initiator during the second FRIB experiment. The measurement involved the detection of neutrons and $$γ$$ rays in two focal planes of the FRIB Decay Station Initiator in a single experiment for the first time. This enabled an analytical consistency in extracting the $$β$$-decay strength distribution over the large range of excitation energies, including neutron unbound states. Here, we observe a rapid increase in the $$β$$-decay strength distribution above the neutron separation energy in $$_{18}^{45}$$Ar₂₇. This was interpreted to be caused by the transitioning of neutrons into protons excited across the Z = 20 shell gap. The SDPF-MU interaction with reduced shell gap best reproduced the data. The measurement demonstrates a new approach that is sensitive to the proton shell gap in neutron rich nuclei according to SDPF-MU calculations.

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Research Organization:: University of Tennessee, Knoxville, TN (United States)

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

Grant/Contract Number:: FG02-96ER40983

OSTI ID:: 2337957

Alternate ID(s):: OSTI ID: 2336813; OSTI ID: 2338253; OSTI ID: 2368533; OSTI ID: 2446784

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 132; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Proton Shell Gaps in N = 28 Nuclei from the First Complete Spectroscopy Study with FRIB Decay Station Initiator

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