Nuclear level density and $\ensuremath{\gamma}$-decay strength of $^{93}\mathrm{Sr}$

Nuclear level density and $γ$ -decay strength of ${}^{93}{Sr}$

A. Sweet, D. L. Bleuel, N. D. Scielzo, L. A. Bernstein, A. C. Dombos, B. L. Goldblum, C. M. Harris, T. A. Laplace, A. C. Larsen, R. Lewis, S. N. Liddick, S. M. Lyons, F. Naqvi, A. Palmisano-Kyle, A. L. Richard, M. K. Smith, A. Spyrou, J. Vujic, and M. Wiedeking

Phys. Rev. C 109, 054305 – Published 6 May 2024

Abstract

This work presents the first experimentally determined nuclear level density and $γ$ -ray strength function of the short-lived fission product ${}^{93}{Sr}$ , accomplished using the $β$ -Oslo method. Direct measurement of the ${}^{92}{Sr} (n, γ) {}^{93}{Sr}$ cross section is not currently possible, as the half-life of 2.66 hours is too short; instead, ${}^{93}{Sr}$ was formed through $β$ decay of ${}^{93}{Rb}$ to excitation energies around the neutron separation energy. The $γ$ -ray spectra were measured using a total absorption spectrometer at the National Superconducting Cyclotron Laboratory (NSCL) at Michigan State University (MSU). The statistical properties of the ${}^{93}{Sr}$ nucleus were experimentally determined, including the $γ$ -ray strength function and nuclear level density. At low energies, the $γ$ -ray strength function exhibits a constant $γ$ -decay strength, rather than a slightly increasing strength with decreasing $γ$ -ray energy as had been previously observed for several nuclei in this mid-mass region. These statistical properties were then implemented in the reaction code talys1.95 to calculate the ${}^{92}{Sr} (n, γ) {}^{93}{Sr}$ cross section.

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Received 25 August 2022
Revised 22 November 2023
Accepted 23 February 2024

DOI:https://doi.org/10.1103/PhysRevC.109.054305

Physics Subject Headings (PhySH)

Beta decay Energy levels Gamma-ray strength functions Level densities Models & methods for nuclear reactions Nuclear astrophysics Nuclear decay Nuclear reaction rates Nuclear structure & decays Radiative capture

90 ≤ A ≤ 149

Radioactive beams Spectrometers & spectroscopic techniques Thermal & statistical models

Nuclear Physics

Authors & Affiliations

A. Sweet ^1,*, D. L. Bleuel ¹, N. D. Scielzo¹, L. A. Bernstein ^2,3, A. C. Dombos^4,5,6, B. L. Goldblum ^2,3, C. M. Harris^4,5,6, T. A. Laplace ², A. C. Larsen ⁷, R. Lewis^4,8, S. N. Liddick^4,8, S. M. Lyons ⁴, F. Naqvi⁴, A. Palmisano-Kyle^4,5,6, A. L. Richard ^1,†, M. K. Smith⁴, A. Spyrou^4,5,6, J. Vujic ², and M. Wiedeking ^9,10,‡

¹Lawrence Livermore National Laboratory (LLNL), Livermore, California 94551, USA
²Department of Nuclear Engineering, University of California, Berkeley (UCB), California 94720, USA
³Lawrence Berkeley National Laboratory (LBNL), Berkeley, California 94720, USA
⁴Facility for Rare Isotope Beams (FRIB)/National Superconducting Cyclotron Laboratory (NSCL), Michigan State University (MSU), East Lansing, Michigan 48824, USA
⁵Department of Physics and Astronomy, Michigan State University (MSU), East Lansing, Michigan 48824, USA
⁶Joint Institute for Nuclear Astrophysics (JINA), Michigan State University (MSU), East Lansing, Michigan 48824, USA
⁷Department of Physics, University of Oslo (UiO), N-0316 Oslo, Norway
⁸Department of Chemistry, Michigan State University (MSU), East Lansing, Michigan 48824, USA
⁹Department of Subatomic Physics, iThemba LABS, Somerset West 7129, South Africa
¹⁰School of Physics, University of the Witwatersrand, Johannesburg 2050, South Africa

^*Formerly at the University of California, Berkeley, California, USA.
^†Formerly at the Facility for Rare Isotope Beams, National Superconducting Cyclotron Laboratory, Michigan State University, Michigan, USA. Currently at Ohio University, Ohio, USA.
^‡Currently at Lawrence Berkeley National Laboratory (LBNL), California, USA.

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Vol. 109, Iss. 5 — May 2024

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Physical Review C

covering nuclear physics

Nuclear level density and $γ$ -decay strength of ${}^{93}{Sr}$

A. Sweet, D. L. Bleuel, N. D. Scielzo, L. A. Bernstein, A. C. Dombos, B. L. Goldblum, C. M. Harris, T. A. Laplace, A. C. Larsen, R. Lewis, S. N. Liddick, S. M. Lyons, F. Naqvi, A. Palmisano-Kyle, A. L. Richard, M. K. Smith, A. Spyrou, J. Vujic, and M. Wiedeking

Phys. Rev. C 109, 054305 – Published 6 May 2024

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Physical Review C

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Nuclear level density and γ-decay strength of Sr93

A. Sweet, D. L. Bleuel, N. D. Scielzo, L. A. Bernstein, A. C. Dombos, B. L. Goldblum, C. M. Harris, T. A. Laplace, A. C. Larsen, R. Lewis, S. N. Liddick, S. M. Lyons, F. Naqvi, A. Palmisano-Kyle, A. L. Richard, M. K. Smith, A. Spyrou, J. Vujic, and M. Wiedeking

Phys. Rev. C 109, 054305 – Published 6 May 2024

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Nuclear level density and $γ$ -decay strength of ${}^{93}{Sr}$