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𝛽−decay of neutron-rich 45Cl located at the magic number 𝑁 = 28

Journal Article · · Physical Review. C
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  1. Florida State University, Tallahassee, FL (United States)
  2. University of Massachusetts, Lowell, MA (United States)
  3. Argonne National Laboratory (ANL), Argonne, IL (United States)
  4. U.S. Army Combat Capabilities Development Command Army Research Laboratory, Adelphi, MD (United States)
  5. Michigan State University, East Lansing, MI (United States)
  6. Mississippi State University, MS (United States)
  7. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  8. Michigan State University, East Lansing, MI (United States); Mississippi State University, MS (United States)
  9. Michigan State University, East Lansing, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
+ Show Author Affiliations
Results from the β-decay study of 45Cl, produced in the fragmentation of a 140-MeV/u 48Ca beam, are presented. The half-life of 45Cl is measured to be 513(36) ms. β– and β–1n decay populate excited states in 45Ar and 44Ar, respectively, and decay schemes for both daughter nuclei are established based on γ-ray singles and γ-γ coincidence data. Comparison with shell-model calculations using the FSU interaction shows that the low-lying negative-parity states in 45Ar are well described by single-neutron configurations near the Fermi surface, whereas positive-parity states require neutron excitations across the N = 20 shell gap, consistent with allowed Gamow–Teller decay from 45Cl. The strong β-feeding to the 5/2+ state in 45Ar supports a 3/2+ ground-state assignment for 45Cl over 1/2+. Furthermore, the high Qβ– value enables population of 1p1h states above the neutron separation energy in 45Ar, leading to positive-parity states in 44Ar through neutron emission. Tentative spin-parity assignments for excited levels in 44Ar are made for the first time based on comparison with shell-model predictions, and the 2978-keV level is identified as an excited 0+ state with a configuration distinct from the ground state.
Research Organization:
Florida State University, Tallahassee, FL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); U.S. National Science Foundation; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
Grant/Contract Number:
AC02-06CH11357; AC52-07NA27344; FG02-94ER40848; NA0003180; NA0003906; SC0009883; SC0020451
OSTI ID:
2930054
Alternate ID(s):
OSTI ID: 2205286
Report Number(s):
LLNL--JRNL-856801
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 2 Vol. 108; ISSN 2469-9985; ISSN 2469-9993
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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