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Title: Multiple-scattering Corrections to Measurements of the Prompt Fission Neutron Spectrum

The Chi-Nu project, conducted jointly by LANL and LLNL, aims to measure the shape of the prompt fission neutron spectrum (PFNS) for fission of {sup 239}Pu induced by neutrons from 50 keV to 15 MeV with accuracies of 3–5% in the outgoing energy from 50 keV to 9 MeV and 15% from 9 to 15 MeV. In order to meet this goal, detailed Monte Carlo simulations are being used to assess the importance and effect of every component in the experimental configuration. As part of this effort, we have also simulated some past PFNS measurements to identify possible sources of systematic error. We find that multiple scattering plays an important role in the target geometry, collimators, and detector response and that past experiments probably underestimated the extent of this effect.
Authors:
 [1] ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] ; ;  [2]
  1. Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
  2. Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States)
Publication Date:
OSTI Identifier:
22436772
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; COMPUTERIZED SIMULATION; FISSION NEUTRONS; KEV RANGE 100-1000; KEV RANGE 10-100; LANL; LAWRENCE LIVERMORE NATIONAL LABORATORY; MEV RANGE 01-10; MEV RANGE 10-100; MONTE CARLO METHOD; MULTIPLE SCATTERING; PLUTONIUM 239 EXPERIMENT DESIGN