Toward complete spectroscopy using decay: The example of
- Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy, and National Superconducting Cyclotron Lab.
- Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy, National Superconducting Cyclotron Lab., and Joint Inst. for Nuclear Astrophysics
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., and 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). Dept. of Physics and Astronomy, National Superconducting Cyclotron Lab.
- Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab., and 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
$$^{32}\textbf{Cl}$$ 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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-00OR22725; SC00106052; NA0000979
- OSTI ID:
- 1564106
- Alternate ID(s):
- OSTI ID: 1464656
- Journal Information:
- Physical Review C, Vol. 98, Issue 2; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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