Branching ratios for the three most intense gamma rays in the decay of 47Ca

Abel, E. Paige; Kleinfeldt, Chloe; Kalman, Morgan; Severin, Gregory W.

doi:10.1016/j.apradiso.2021.109994

Branching ratios for the three most intense gamma rays in the decay of ⁴⁷Ca

Journal Article · Fri Oct 22 00:00:00 EDT 2021 · Applied Radiation and Isotopes

DOI:https://doi.org/10.1016/j.apradiso.2021.109994· OSTI ID:1976864

^[1]; Kleinfeldt, Chloe ^[2]; Kalman, Morgan ^[2]; ^[2]

Michigan State University, East Lansing, MI (United States). National Superconducting Cyclotron Laboratory; OSTI
Michigan State University, East Lansing, MI (United States). National Superconducting Cyclotron Laboratory

A sample of ⁴⁷Ca produced through isotope harvesting at the National Superconducting Cyclotron Laboratory was used to measure branching ratios of 7.17(5)%, 7.11(5)%, and 75.0(5)% for the 489.2, 807.9, and 1297.1 keV characteristic gamma rays, respectively. Based on these updated branching ratios, the ground state to ground state ⁴⁷Ca to ⁴⁷Sc beta decay branching ratio has been indirectly measured as 17.7(5)% and the ground state to 1297.1 keV excited state as 82.2(5)%. Here these values represent a greatly increased precision for all five branching ratios compared to the currently accepted values. The measurements presented here were made relative to the ingrown 47Sc daughter in a⁴⁷Ca sample and the well-established 159.4 keV gamma-ray branching ratio and the half-life for the decay of ⁴⁷Sc. These measurements were supported by verifying that the half-lives measured from characteristic gamma-ray peaks over multiple spectra for both ⁴⁷Ca and ⁴⁷Sc were consistent with previously reported values. Additionally, the half-lives of both ⁴⁷Ca and ⁴⁷Sc were independently measured with Liquid Scintillation Counting to reverify the previously reported values used in this study to find updated gamma-ray branching ratio values.

View Accepted Manuscript (DOE)

Research Organization:: Krell Institute, Ames, IA (United States); Michigan State University, East Lansing, MI (United States)

Sponsoring Organization:: Michigan State University; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: NA0003864; SC0018637

OSTI ID:: 1976864

Journal Information:: Applied Radiation and Isotopes, Journal Name: Applied Radiation and Isotopes Journal Issue: C Vol. 179; ISSN 0969-8043

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

References (14)

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Branching ratios for the three most intense gamma rays in the decay of 47Ca

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Branching ratios for the three most intense gamma rays in the decay of ⁴⁷Ca