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Title: $β^-$ decay of $$T_z$$ = +$$\frac{11}{2}$$ isotopes $$\mathrm{^{37}Al}$$ and $$\mathrm{^{39}Si}$$: Understanding Gamow-Teller strength distribution in neutron-rich nuclei

Journal Article · · Physical Review C
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [7];  [1];  [2];  [1];  [3];  [1];  [8];  [3];  [9];  [10];  [1];  [1]
  1. Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
  3. Michigan State Univ., East Lansing, MI (United States). Dept. of Chemistry, and National Superconducting Cyclotron Lab.
  4. Univ. of Tokyo (Japan). Dept. of Physics
  5. Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Univ. of Tokyo (Japan). Center for Nuclear Study
  6. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Univ. of Massachusetts, Amherst, MA (United States). Dept. of Physics
  7. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Mississippi State Univ., Mississippi State, MS (United States). Dept. of Physics
  8. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Univ. of Tokyo (Japan). Dept. of Physics; Katholieke Univ., Leuven (Belgium). Inst. voor Kern-en Stralingsfysica
  9. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  10. Univ. of Tokyo (Japan). Center for Nuclear Study

$β^-$ decay of $$T_z$$ = +$$\frac{11}{2}$$ nuclei $$\mathrm{^{37}Al}$$ and $$\mathrm{^{39}Si}$$ was studied to obtain information about excited states in the daughter and granddaughter nuclei. New information on excited states has been obtained for $$\mathrm{^{37,39}P}$$ whereas level schemes for $$\mathrm{^{37}Si}$$ and $$\mathrm{^{37,39}S}$$ were confirmed and expanded on as compared to the most recent investigations. For the nuclei studied, the valence proton and neutron occupy different major shells with opposite parities, hence, the $β^-$ decay preferentially and primarily populates core-excited $1p1h$ intruder states with a parity opposite to the ground state of the daughter nucleus. These low-lying intruder states shed light on the $N = 20$ shell gap and its evolution with neutron number. The $β^-$ decay of very neutron-rich nuclei also illustrates how the Gamow-Teller (GT) strength distribution changes with neutron excess. Comparing $β^-$ decay of $$\mathrm{^{37,39}Si}$$ presented here with $$\mathrm{^{38,40}Si}$$ from a previous study, we clearly see an even-odd effect in the GT strength distribution with the decay from even-even nuclei showing strong low-lying strength whereas for the odd $$A$$ being very fragmented. Finally, configuration interaction shell-model calculations with the state-of-art SDPFSDG-MU effective interaction were performed to understand the structure of the $1p1h$ states and explore the GT strength distribution.

Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003841; AC02-05CH11231; SC0009883; NA0000979; NA0002132; NA00033221; NA0003180
OSTI ID:
1574994
Alternate ID(s):
OSTI ID: 1545426
Journal Information:
Physical Review C, Vol. 100, Issue 1; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 2 works
Citation information provided by
Web of Science

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Figures / Tables (18)