$β^-$ decay of $$T_z$$ = +$$\frac{11}{2}$$ isotopes $$\mathrm{^{37}Al}$$ and $$\mathrm{^{39}Si}$$: Understanding Gamow-Teller strength distribution in neutron-rich nuclei
- Florida State Univ., Tallahassee, FL (United States). Dept. of Physics
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Nuclear Science Division
- Michigan State Univ., East Lansing, MI (United States). Dept. of Chemistry, and National Superconducting Cyclotron Lab.
- Univ. of Tokyo (Japan). Dept. of Physics
- Japan Atomic Energy Agency (JAEA), Tokai (Japan). Advanced Science Research Center; Univ. of Tokyo (Japan). Center for Nuclear Study
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Univ. of Massachusetts, Amherst, MA (United States). Dept. of Physics
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Mississippi State Univ., Mississippi State, MS (United States). Dept. of Physics
- 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
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
- 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
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