237Np Fission Spectrum Cumulative Fission Product Yield Measurement Using Godiva IV Critical Assembly

Tamashiro, A. S.; Harke, J. T.; Duarte, J. G.; Mishnayot, Y.; Burcher, S.; Padgett, S. W.; Zhao, P.; Pierson, B. D.; Gharibyan, N.; Goda, J. M.; Greenwood, L. R.; Hayes, D. K.; Hutchinson, J.; Harward, N.; Roberts, K.; Slavik, G.; Yap-Chiongco, P.; Walker, J.; Palmer, C. J.

doi:10.1016/j.nds.2024.01.006

²³⁷Np Fission Spectrum Cumulative Fission Product Yield Measurement Using Godiva IV Critical Assembly

Journal Article · Tue Feb 06 00:00:00 EST 2024 · Nuclear Data Sheets

DOI:https://doi.org/10.1016/j.nds.2024.01.006· OSTI ID:2429666

Tamashiro, A. S.; Harke, J. T.; Duarte, J. G.; Mishnayot, Y.; Burcher, S.; Padgett, S. W.; Zhao, P.; Pierson, B. D.; Gharibyan, N.; Goda, J. M.; Greenwood, L. R.; Hayes, D. K.; Hutchinson, J.; Harward, N.; Roberts, K.; Slavik, G.; Yap-Chiongco, P.; Walker, J.; Palmer, C. J.

Precise integral measurement of fast neutron-induced fission product yields for various actinides is of high interest for applied nuclear science. The goal of this effort is to improve uncertainties in fission product yield values of ²³⁷Np. Fission was induced in a NpO₂(NO₃) target using the Godiva IV critical assembly in burst mode. The irradiated sample was transferred to a high-resolution γ-ray detection setup within 50 minutes. γ-ray list mode data was collected from 50 minutes to 1 week after the irradiation. γ-ray spectroscopy was performed to analyze the time dependent γ-ray yields using an automated peak search algorithm to identify isotopes by their decay γ-ray energy and half-life. Finally, the initial activity for each isotope identified was used to calculate their fission product yield.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)

Grant/Contract Number:: AC05-76RL01830; AC52-07NA27344

OSTI ID:: 2429666

Alternate ID(s):: OSTI ID: 2439220

Report Number(s):: LLNL--JRNL-868053; PNNL-SA--195252; 1097704

Journal Information:: Nuclear Data Sheets, Journal Name: Nuclear Data Sheets Vol. 193; ISSN 0090-3752

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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