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

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.
Authors:
 [1] ;  [1] ; ;  [2] ;  [1] ;  [2] ;  [3] ;  [4] ; ;  [5]
  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)
Publication Date:
OSTI Identifier:
22436774
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Data Sheets; Journal Volume: 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)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; DATA COVARIANCES; EVALUATION; FISSION NEUTRONS; KEV RANGE 100-1000; NUCLEAR DATA COLLECTIONS; PLUTONIUM 239