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Low spin spectroscopy of neutron-rich Cl 43,44,45 via β- and βn decay

Journal Article · · Physical Review. C
 [1];  [1];  [2];  [3];  [1];  [1];  [4];  [5];  [6];  [7];  [4];  [7];  [4];  [8];  [8];  [9];  [4];  [10];  [8];  [4] more »;  [8];  [10];  [5];  [11];  [8];  [12];  [8];  [8];  [13];  [5] « less
  1. Florida State Univ., Tallahassee, FL (United States)
  2. Florida State Univ., Tallahassee, FL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  3. Florida State Univ., Tallahassee, FL (United States); Michigan State Univ., East Lansing, MI (United States)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. Univ. of Massachusetts, Lowell, MA (United States)
  6. Argonne National Laboratory (ANL), Argonne, IL (United States)
  7. U.S. Army Combat Capabilities Development Command Army Research Laboratory (DEVCOM), Adelphi, MD (United States)
  8. Mississippi State Univ., Mississippi State, MS (United States)
  9. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  10. Michigan State Univ., East Lansing, MI (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
  11. Univ. of Tsukuba (Japan)
  12. Japan Atomic Energy Agency (JAEA), Tokai (Japan); Univ. of Tokyo (Japan)
  13. Utsunomiya University (Japan)
+ Show Author Affiliations

In this article, β- decay studies of neutron-rich isotopes 43,45S performed at the National Superconducting Cyclotron Laboratory are reported. β-delayed $$\gamma$$ transitions were detected by an array of 16 clover detectors surrounding the Beta Counting Station, which consists of a 40×40 double-sided silicon strip detector followed by a single-sided silicon strip detector. β-decay half-lives were extracted for 43,45S by correlating implants and decays in the pixelated implant detector and by considering further coincidences with $$\gamma$$ transitions in the daughter nuclei. Further, the level structures of 43,45Cl are expanded by the addition of 20 and 8 new $$\gamma$$ transitions in 43Cl and 45Cl respectively, and core-excited negative-parity states were observed in both nuclei for the first time. For 45S, a large fraction of the β-decay strength was observed feeding neutron-unbound states in 45Cl, which, decaying by delayed neutrons, populated excited states in the β⁢1⁢n daughter, 44Cl. Experimental observations were compared to detailed shell-model calculations using the SDPFSDG-MU interaction to highlight the role of the diminished N = 28 neutron shell gap and the near degeneracy of the proton s1/2 and d3/2 orbitals in the structure of the neutron-rich Cl isotopes. The current work also provides further support to a ground-state spin-parity assignment of 3/2+ in 45Cl.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP); Nuclear Science and Security Consortium
Grant/Contract Number:
AC52-07NA27344; SC0020451; FG02-94ER40848; NA0003906; AC02-06CH11357; NA0003180
OSTI ID:
2375409
Alternate ID(s):
OSTI ID: 2474692
Report Number(s):
LLNL--JRNL-865479; 1099668
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Journal Issue: 4 Vol. 109; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Figures / Tables (16)

FIG. 1(p. 24)figure FIG. 1
FIG. 2(p. 25)figure FIG. 2
FIG. 3(p. 26)figure FIG. 3
FIG. 4(p. 27)figure FIG. 4
FIG. 5(p. 28)figure FIG. 5
FIG. 6(p. 29)figure FIG. 6
FIG. 7(p. 30)figure FIG. 7
FIG. 8(p. 31)figure FIG. 8
FIG. 9(p. 32)figure FIG. 9
FIG. 10(p. 33)figure FIG. 10
FIG. 11(p. 34)figure FIG. 11
FIG. 12(p. 35)figure FIG. 12
TABLE I(p. 36)table TABLE I
TABLE II(p. 37)table TABLE II
TABLE III(p. 38)table TABLE III
TABLE IV(p. 39)table TABLE IV

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