The LANL/LLNL Prompt Fission Neutron Spectrum Program at LANSCE and Approach to Uncertainties

New data on the prompt fission neutron spectra (PFNS) from neutron-induced fission with higher accuracies are needed to resolve discrepancies in the literature and to address gaps in the experimental data. The Chi-Nu project, conducted jointly by LANL and LLNL, aims to measure the shape of the PFNS...

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Bibliographic Details
Published in:Nuclear data sheets 2015-01, Vol.123, p.130-134
Main Authors: Haight, R.C., Wu, C.Y., Lee, H.Y., Taddeucci, T.N., Perdue, B.A., O'Donnell, J.M., Fotiades, N., Devlin, M., Ullmann, J.L., Bredeweg, T.A., Jandel, M., Nelson, R.O., Wender, S.A., Neudecker, D., Rising, M.E., Mosby, S., Sjue, S., White, M.C., Bucher, B., Henderson, R.
Format: Article
Language:English
Subjects:
DATA COVARIANCES
FISSION
FISSION NEUTRONS
LANL
LAWRENCE LIVERMORE NATIONAL LABORATORY
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRON DETECTORS
NEUTRON REACTIONS
NEUTRON SOURCES
NUCLEAR PHYSICS AND RADIATION PHYSICS
PLUTONIUM 239
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Summary:New data on the prompt fission neutron spectra (PFNS) from neutron-induced fission with higher accuracies are needed to resolve discrepancies in the literature and to address gaps in the experimental data. The Chi-Nu project, conducted jointly by LANL and LLNL, aims to measure the shape of the PFNS for fission of 239Pu induced by neutrons from 0.5 to 20 MeV with accuracies of 3–5% in the outgoing energy from 0.1 to 9 MeV and 15% from 9 to 12 MeV and to provide detailed experimental uncertainties. Neutrons from the WNR/LANSCE neutron source are being used to induce fission in a Parallel-Plate Avalanche Counter (PPAC). Two arrays of neutron detectors are used to cover the energy range of neutrons emitted promptly in the fission process. Challenges for the present experiment include background reduction, use of 239Pu in a PPAC, and understanding neutron detector response. Achieving the target accuracies requires the understanding of many systematic uncertainties. The status and plans for the future will be presented.
ISSN:0090-3752
1095-9904
DOI:10.1016/j.nds.2014.12.023