Remeasurement of the 239Pu(n,f)/235U(n,f) Cross-Section Ratio with the NIFFTE fission Time Projection Chamber Using Vapor-deposited Targets

Dongwi, D.H.; Snyder, L.; Aguilar, V.; Androski, N.; Anastasiou, M.; Bowden, N.S.; Chemey, A.; Classen, T.; Fuzaro Alencar, J.E.; Greife, U.; Haseman, M.; Isenhower, L.D.; Klay, J.L.; Loveland, W.; Mendenhall, M.P.; Monterial, M.; Prokop, C.; Silveira, M.; Watson, T.S.; Yao, L.

doi:10.1016/j.nds.2025.04.003

Remeasurement of the ²³⁹Pu(n,f)/²³⁵U(n,f) Cross-Section Ratio with the NIFFTE fission Time Projection Chamber Using Vapor-deposited Targets

Journal Article · Tue May 13 00:00:00 EDT 2025 · Nuclear Data Sheets

DOI:https://doi.org/10.1016/j.nds.2025.04.003· OSTI ID:2567119

Dongwi, D.H. ^[1]; Snyder, L. ^[1]; Aguilar, V. ^[2]; Androski, N. ^[2]; Anastasiou, M. ^[1]; Bowden, N.S. ^[1]; Chemey, A. ^[3]; Classen, T. ^[1]; Fuzaro Alencar, J.E. ^[2]; Greife, U. ^[4]; Haseman, M. ^[4]; Isenhower, L.D. ^[5]; Klay, J.L. ^[2]; Loveland, W. ^[3]; Mendenhall, M.P. ^[1]; Monterial, M. ^[1]; Prokop, C. ^[6]; Silveira, M. ^[3]; Watson, T.S. ^[5]; Yao, L. ^[3]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
California Polytechnic State Univ. (CalPoly), San Luis Obispo, CA (United States)
Oregon State Univ., Corvallis, OR (United States)
Colorado School of Mines, Golden, CO (United States)
Abilene Christian Univ., TX (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

The NIFFTE fission Time Projection Chamber (fissionTPC) has been used to measure the ²³⁹Pu(n,f)/²³⁵U(n,f) cross-section ratio for neutron-induced fission in the range of 0.1–100 MeV, with high precision. A white neutron source was provided by the Los Alamos Neutron Science Center, where the experiment was conducted as a remeasurement to evaluate a roughly 2% discrepancy of the previous fissionTPC results with ENDF/B-VIII.0. Further, a detailed accounting of measurement uncertainties was performed, based on the fissionTPC's novel ability to provide three-dimensional reconstruction of fission-fragment ionization profiles. Current results obtained using a vapor-deposited, highly uniform ²³⁹Pu target, in comparison to the measurement published in 2021, where a ²³⁹Pu electroplated target was used, are presented and discussed. The remeasurement presented here is in agreement with the previous fissionTPC result within measurement uncertainties.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: NIFFTE Collaboration

Grant/Contract Number:: 89233218CNA000001; AC52-07NA27344; NA0002921

OSTI ID:: 2567119

Report Number(s):: LLNL--JRNL-2000446

Journal Information:: Nuclear Data Sheets, Journal Name: Nuclear Data Sheets Vol. 202; ISSN 0090-3752

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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