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Title: Toward complete spectroscopy using β decay: The example of Cl 32 ( β γ ) S 32

Abstract

$$^{32}\textbf{Cl}$$ is a neutron-deficient isotope with a $β$-decay half-life of 298 ms and a spin and parity of $J^π=1^+$. Previous measurements of $$^{32}\textbf{Cl}$$ $β$-delayed $γ$ rays have yielded a $β$-decay scheme with twelve $β$-decay transitions, contributing to studies of nuclear structure and fundamental symmetries. Those experiments have been limited to the observation of $$^{32}\textbf{S}$$ states with $J^π = 0^+,1^+, 2^+$. Our goal is to search for new $β$-delayed $γ$ rays and $β$-decay transitions of $$^{32}\textbf{Cl}$$ to $$^{32}\textbf{S}$$. A measurement of $$^{32}\textbf{Cl}$$ $β$-delayed $γ$ decay has been performed using the Clovershare array of high-purity germanium detectors at the National Superconducting Cyclotron Laboratory. By acquiring the highest-statistics $$^{32}\textbf{Cl}$$ $β$-delayed $γ$-ray spectrum to date and exploiting a new sensitivity to $γ-γ$ coincidences, this experiment has enabled the observation of nine previously unobserved $β$-delayed $γ$-ray transitions, leading to the inference of five $β$-decay transitions never before observed in $$^{32}\textbf{Cl}$$ $β$-delayed $γ$ decay. The set of observed states includes negative-parity states for the first time. By combining the new information with data from previous work, the lifetimes and partial widths of the 8861- and 9650-keV states of $$^{32}\textbf{S}$$ have been determined. In addition, the $$^{31}\textbf{P}$$($p,α$)$$^{28}\textbf{Si}$$ resonance strength of the 9650-keV state has been limited to $ωγ<9.8$ meV, which is an improvement over direct measurements. An enhanced decay scheme has been constructed. Most of the excited bound $$^{32}\textbf{S}$$ states that would correspond to allowed and first-forbidden $β$-decay transitions have been observed, demonstrating the potential of $β$-decay experiments to approach complete spectroscopy measurements at the next generation of radioactive beam facilities. The observed positive-parity levels are well matched by $sd$ shell-model calculations.

Authors:
 [1];  [2];  [1];  [3];  [4];  [1];  [5];  [1];  [6];  [7];  [2];  [8];  [9];  [6];  [2];  [2];  [5];  [10];  [4];  [2] more »;  [11];  [4];  [7];  [6];  [8] « less
  1. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy, and National Superconducting Cyclotron Lab.
  2. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy, National Superconducting Cyclotron Lab., and Joint Inst. for Nuclear Astrophysics
  3. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
  4. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., and Dept. of Chemistry
  5. Univ. of Notre Dame, IN (United States). Dept. of Physics
  6. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
  8. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy, National Superconducting Cyclotron Lab.
  9. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., and Joint Inst. for Nuclear Astrophysics
  10. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  11. 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:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1564106
Alternate Identifier(s):
OSTI ID: 1464656
Grant/Contract Number:  
AC05-00OR22725; SC00106052; NA0000979
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 98; Journal Issue: 2; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Aboud, E., Bennett, M. B., Wrede, C., Friedman, M., 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., McNeice, E. I., Meisel, Z., Ong, W. -J., O'Malley, P. D., Pain, S. D., Prokop, C. J., Schatz, H., Schwartz, S. B., Suchyta, S., Thompson, P., Walters, M., and Xu, X. Toward complete spectroscopy using β decay: The example of Cl32(βγ)S32. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.98.024309.
Aboud, E., Bennett, M. B., Wrede, C., Friedman, M., 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., McNeice, E. I., Meisel, Z., Ong, W. -J., O'Malley, P. D., Pain, S. D., Prokop, C. J., Schatz, H., Schwartz, S. B., Suchyta, S., Thompson, P., Walters, M., & Xu, X. Toward complete spectroscopy using β decay: The example of Cl32(βγ)S32. United States. doi:10.1103/PhysRevC.98.024309.
Aboud, E., Bennett, M. B., Wrede, C., Friedman, M., 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., McNeice, E. I., Meisel, Z., Ong, W. -J., O'Malley, P. D., Pain, S. D., Prokop, C. J., Schatz, H., Schwartz, S. B., Suchyta, S., Thompson, P., Walters, M., and Xu, X. Wed . "Toward complete spectroscopy using β decay: The example of Cl32(βγ)S32". United States. doi:10.1103/PhysRevC.98.024309. https://www.osti.gov/servlets/purl/1564106.
@article{osti_1564106,
title = {Toward complete spectroscopy using β decay: The example of Cl32(βγ)S32},
author = {Aboud, E. and Bennett, M. B. and Wrede, C. and Friedman, M. 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 McNeice, E. I. and Meisel, Z. and Ong, W. -J. 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 = {$^{32}\textbf{Cl}$ is a neutron-deficient isotope with a $β$-decay half-life of 298 ms and a spin and parity of $J^π=1^+$. Previous measurements of $^{32}\textbf{Cl}$ $β$-delayed $γ$ rays have yielded a $β$-decay scheme with twelve $β$-decay transitions, contributing to studies of nuclear structure and fundamental symmetries. Those experiments have been limited to the observation of $^{32}\textbf{S}$ states with $J^π = 0^+,1^+, 2^+$. Our goal is to search for new $β$-delayed $γ$ rays and $β$-decay transitions of $^{32}\textbf{Cl}$ to $^{32}\textbf{S}$. A measurement of $^{32}\textbf{Cl}$ $β$-delayed $γ$ decay has been performed using the Clovershare array of high-purity germanium detectors at the National Superconducting Cyclotron Laboratory. By acquiring the highest-statistics $^{32}\textbf{Cl}$ $β$-delayed $γ$-ray spectrum to date and exploiting a new sensitivity to $γ-γ$ coincidences, this experiment has enabled the observation of nine previously unobserved $β$-delayed $γ$-ray transitions, leading to the inference of five $β$-decay transitions never before observed in $^{32}\textbf{Cl}$ $β$-delayed $γ$ decay. The set of observed states includes negative-parity states for the first time. By combining the new information with data from previous work, the lifetimes and partial widths of the 8861- and 9650-keV states of $^{32}\textbf{S}$ have been determined. In addition, the $^{31}\textbf{P}$($p,α$)$^{28}\textbf{Si}$ resonance strength of the 9650-keV state has been limited to $ωγ<9.8$ meV, which is an improvement over direct measurements. An enhanced decay scheme has been constructed. Most of the excited bound $^{32}\textbf{S}$ states that would correspond to allowed and first-forbidden $β$-decay transitions have been observed, demonstrating the potential of $β$-decay experiments to approach complete spectroscopy measurements at the next generation of radioactive beam facilities. The observed positive-parity levels are well matched by $sd$ shell-model calculations.},
doi = {10.1103/PhysRevC.98.024309},
journal = {Physical Review C},
issn = {2469-9985},
number = 2,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

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Figures / Tables:

FIG. 1 FIG. 1: Mechanical design drawing of the experimental apparatus used in the present work. The 32Cl beam enters from the left and is implanted into the scintillator (obscured) in the center of the Ge array. The $β$-delayed $γ$-rays are detected by the nine surrounding high-purity Ge detectors, with eight detectorsmore » forming two rings around the scintillator and one detector along the beam axis. Each of the nine high-purity Ge detectors consists of four crystals.« less

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