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Title: Detailed study of the decay Cl 31 ( β γ ) S 31

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 upmore » 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.« less
Authors:
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [2] ;  [5] ;  [6] ;  [1] ;  [2] ;  [7] ;  [3] ;  [5] ;  [1] ;  [1] ;  [4] ;  [8] ;  [3] ;  [1] ;  [9] more »;  [3] ;  [6] ;  [5] ;  [2] « less
  1. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy. National Superconducting Cyclotron Lab. Joint Inst. for Nuclear Astrophysics
  2. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy. National Superconducting Cyclotron Lab.
  3. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. Dept. of Chemistry
  4. Univ. of Notre Dame, IN (United States). Dept. of Physics
  5. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
  6. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  7. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. Joint Inst. for Nuclear Astrophysics
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  9. 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
Publication Date:
Grant/Contract Number:
AC05-00OR22725; NA0000979; SC0016052; PHY-1102511; PHY-1404442; PHY-1419765; PHY-1430152
Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 97; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Michigan State Univ., East Lansing, MI (United States); McMaster Univ., Hamilton, ON (Canada)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Nuclear Nonproliferation (NA-20); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS; beta decay; nuclear astrophysics; resonance reactions
OSTI Identifier:
1479729
Alternate Identifier(s):
OSTI ID: 1454316

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., and Xu, X.. Detailed study of the decay Cl31(βγ)S31. United States: N. p., Web. doi:10.1103/PhysRevC.97.065803.
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.. Detailed study of the decay Cl31(βγ)S31. United States. doi:10.1103/PhysRevC.97.065803.
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., and Xu, X.. 2018. "Detailed study of the decay Cl31(βγ)S31". United States. doi:10.1103/PhysRevC.97.065803.
@article{osti_1479729,
title = {Detailed study of the decay Cl31(βγ)S31},
author = {Bennett, M. B. and Wrede, C. and Liddick, S. N. and Pérez-Loureiro, D. and Bardayan, D. W. and Brown, B. A. and Chen, A. A. and Chipps, K. A. and Fry, C. and Glassman, B. E. and Langer, C. and Larson, N. R. and McNeice, E. I. and Meisel, Z. and Ong, W. and O'Malley, P. D. and Pain, S. D. and Prokop, C. J. and Schatz, H. and Schwartz, S. B. and Suchyta, S. and Thompson, P. and Walters, M. and Xu, X.},
abstractNote = {Background: 31Cl is a neutron-deficient isotope with a half-life of T1/2 = 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.},
doi = {10.1103/PhysRevC.97.065803},
journal = {Physical Review C},
number = 6,
volume = 97,
place = {United States},
year = {2018},
month = {6}
}