Detailed study of the decay Cl31(βγ)S31

Bennett, M. B.; Wrede, C.; Liddick, S. N.; Pérez-Loureiro, D.; Bardayan, D. W.; Brown, B. A.; Chen, A. A.; Chipps, K. A.; Fry, C.; Glassman, B. E.; Langer, C.; Larson, N. R.; McNeice, E. I.; Meisel, Z.; Ong, W.; O'Malley, P. D.; Pain, S. D.; Prokop, C. J.; Schatz, H.; Schwartz, S. B.; Suchyta, S.; Thompson, P.; Walters, M.; Xu, X.

doi:10.1103/PhysRevC.97.065803

Detailed study of the decay ${}^{31}{Cl} (β γ) {}^{31}S$

Journal Article · Thu Jun 14 00:00:00 EDT 2018 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.97.065803· OSTI ID:1479729

Bennett, M. B. ^[1]; Wrede, C. ^[2]; Liddick, S. N. ^[3]; Pérez-Loureiro, D. ^[2]; Bardayan, D. W. ^[4]; Brown, B. A. ^[2]; Chen, A. A. ^[5]; Chipps, K. A. ^[6]; Fry, C. ^[1]; Glassman, B. E. ^[2]; Langer, C. ^[7]; Larson, N. R. ^[3]; McNeice, E. I. ^[5]; Meisel, Z. ^[1]; Ong, W. ^[1]; O'Malley, P. D. ^[4]; Pain, S. D. ^[8]; Prokop, C. J. ^[3]; Schatz, H. ^[1]; Schwartz, S. B. ^[9] more »

Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy. National Superconducting Cyclotron Lab. Joint Inst. for Nuclear Astrophysics
Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy. National Superconducting Cyclotron Lab.
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. Dept. of Chemistry
Univ. of Notre Dame, IN (United States). Dept. of Physics
McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. Joint Inst. for Nuclear Astrophysics
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy. National Superconducting Cyclotron Lab.; Univ. of Southern Indiana, Evansville, IN (United States). Dept. of Geology and Physics

Background: ³¹Cl is a neutron-deficient isotope with a half-life of T_1/2 = 190 (1) ms. The nuclear structure of its daughter, ³¹S, is important for the determination of the thermonuclear ³⁰P(p,γ)³¹S reaction rate, which affects the final isotopic abundances of the ejecta from classical oxygen-neon novae. Purpose: Here, we aim to determine the β feedings, γ-decay branchings, and excitation energies of states populated in ³¹S and create a comprehensive decay scheme for comparison with predictions based on the shell model. Methods: Using a ³¹Cl rare istope beam implanted into a plastic scintillator and an array of high-purity Ge detectors, γ rays from the ³¹Cl(βγ)³¹S decay sequence were measured. Shell-model calculations using the USDB and the recently-developed USDE interactions were performed for comparison. Results: A ³¹Cl β-decay scheme was constructed from the experimental data and compared to the USDB and USDE shell-model calculations based on the β feeding and γ-decay branches of each observed state. 33 new γ-ray transitions and ten new β decay branches were observed. The β feeding and γ-decay branches of each observed state were compared to those from the USDB and USDE shell-model calculations. For every allowed transition predicted by the USD calculations up to an excitation energy of 6.4 MeV in ³¹S, an analogous transition was found in the experimental data, enabling a one-to-one comparison with the shell model. Using these identifications, spin and parity arguments were made for observed states. Conclusions: The new ³¹Cl γ-decay scheme presented in this work is the most complete and precise one for this nucleus constructed to date, incorporating statistics over an order of magnitude higher than previous work on ³¹Cl β-delayed γ decay. Of particular interest is the discovery of a 6390-keV state that mixes with the isobaric analog state and affects the ³⁰P(p,γ)³¹S reaction rate. Other states observed in the decay are not expected to strongly affect the ³⁰P(p,γ)³¹S reaction rate, but the comprehensive comparison to the shell model helps to clarify spin and parity assignments of resonances that might affect the rate.

View Accepted Manuscript (DOE)

Research Organization:: McMaster Univ., Hamilton, ON (Canada); Michigan State Univ., East Lansing, MI (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF) (United States); Natural Sciences and Engineering Research Council of Canada (NSERC); USDOE; USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-00OR22725; NA0000979; SC0016052

OSTI ID:: 1479729

Alternate ID(s):: OSTI ID: 1454316

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 97; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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