2024/09/26 by D. H. Dongwi, Dongwi, D. H., L. Snyder +37 · 1 citation
Engineering · Physics and Astronomy · #FOS: Physical sciences #Nuclear Experiment (nucl-ex) #Nuclear Physics and Applications #Nuclear physics research studies #Nuclear reactor physics and engineering
paper · pdf · doi:10.48550/arxiv.2409.18279
openalex publication_date 2024/09/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
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. 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.