Preliminary Evaluation and Uncertainty Quantification of the Prompt Fission Neutron Spectrum of {sup 239}Pu

Journal Article · Thu Jan 15 00:00:00 EST 2015 · Nuclear Data Sheets

DOI:https://doi.org/10.1016/J.NDS.2014.12.026· OSTI ID:22436774

Talou, P. ^[1]; Taddeucci, T. N.; Haight, R. C. ^[2]; Kawano, T. ^[1]; Lee, H. Y. ^[2]; Smith, D. L. ^[3]; Capote, R. ^[4]; Rising, M. E.; White, M. C. ^[5]

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1. T-2: Nuclear and Particle Physics, Astrophysics and Cosmology, Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
2. LANSCE-NS: Neutron and Nuclear Science, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
3. Nuclear Engineering Division, Argonne National Laboratory, Coronado, CA 92118 (United States)
4. Nuclear Data Section, International Atomic Energy Agency, Vienna, A-1400 (Austria)
5. X-Division, Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)

Low evaluated uncertainties were obtained in a previous evaluation of the {sup 239}Pu prompt fission neutron spectrum and associated covariances for incident neutrons of 0.5 MeV, which were enlarged a-posteriori before being incorporated into ENDF/B-VII.1. These low evaluated uncertainties triggered an in-depth study and improved estimate of experimental as well as model uncertainties. Here, we will summarize these efforts and show that the improved estimate of experimental and model uncertainties leads to corresponding evaluated uncertainties in good agreement with uncertainties obtained in a statistical analysis based primarily on experimental information.

• OSTI ID: 22436774
• Journal Information: Nuclear Data Sheets, Vol. 123; Conference: International workshop on nuclear data covariances, Santa Fe, NM (United States), 28 Apr - 1 May 2014; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0090-3752
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DATA COVARIANCES
EVALUATION
FISSION NEUTRONS
KEV RANGE 100-1000
NUCLEAR DATA COLLECTIONS
PLUTONIUM 239