Cumulative fission yields of short-lived fission products from 235U and 239Pu measured by HPGe gamma-ray spectroscopy

Kim, Samuel; Martoff, C. J.; Dion, Michael; Glasgow, David

doi:10.1016/j.nima.2023.169001

Title: Cumulative fission yields of short-lived fission products from ²³⁵U and ²³⁹Pu measured by HPGe gamma-ray spectroscopy

Journal Article · Thu Dec 07 00:00:00 EST 2023 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2023.169001· OSTI ID:2267572

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Brookhaven National Laboratory (BNL), Upton, NY (United States); Temple Univ., Philadelphia, PA (United States)
Temple Univ., Philadelphia, PA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

In this study, we present a preliminary investigation focused on determining cumulative fission yields for short-lived fission products. Our analysis involves examining gamma spectra from the irradiated samples of ²³⁵U and ²³⁹Pu using the High Flux Isotope Reactor. The motivation stems from the observed discrepancy in the antineutrino energy spectrum within the range of 5 to 7 MeV. While several hypotheses have been proposed, a thorough analysis of fission yields provides an additional way of gaining insight into this unexplained phenomenon. Our study suggests that the measured gamma rays from ¹⁰⁰ Nb, ¹⁴⁰ Cs and ⁹⁵ Sr are consistent with the expected values. However, ⁹³ Rb, ⁹⁶Y, ⁹⁷Y and ¹⁴² Cs cannot be quantified due to insufficient statistics, interference from other gamma rays and the Compton scattering background. Additionally, the calculated cumulative fission yields based on the measured ¹⁴⁰ Cs and ⁹⁵ Sr are found to be consistent with the JEFF3.3 fission yield library. In conclusion, the present work shows that the potential of improving gamma-ray spectroscopy in the fission yields as a means to improve our understanding of the antineutrino spectrum.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)

Grant/Contract Number:: SC0012704; AC02-98CH10886; NSF-PHY1242611; NSF-1812504; 1747523; 1314483; AC05-00OR22725

OSTI ID:: 2267572

Alternate ID(s):: OSTI ID: 2281104

Report Number(s):: BNL-225107-2023-JAAM

Journal Information:: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 1059; ISSN 0168-9002

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Gamma-ray spectroscopy
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Title: Cumulative fission yields of short-lived fission products from 235U and 239Pu measured by HPGe gamma-ray spectroscopy

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Title: Cumulative fission yields of short-lived fission products from ²³⁵U and ²³⁹Pu measured by HPGe gamma-ray spectroscopy