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Title: Fission neutron spectra measurements at LANSCE - status and plans

Abstract

A program to measure fission neutron spectra from neutron-induced fission of actinides is underway at the Los Alamos Neutron Science Center (LANSCE) in a collaboration among the CEA laboratory at Bruyeres-le-Chatel, Lawrence Livermore National Laboratory and Los Alamos National Laboratory. The spallation source of fast neutrons at LANSCE is used to provide incident neutron energies from less than 1 MeV to 100 MeV or higher. The fission events take place in a gas-ionization fission chamber, and the time of flight from the neutron source to that chamber gives the energy of the incident neutron. Outgoing neutrons are detected by an array of organic liquid scintillator neutron detectors, and their energies are deduced from the time of flight from the fission chamber to the neutron detector. Measurements have been made of the fission neutrons from fission of {sup 235}U, {sup 238}U, {sup 237}Np and {sup 239}Pu. The range of outgoing energies measured so far is from 1 MeV to approximately 8 MeV. These partial spectra and average fission neutron energies are compared with evaluated data and with models of fission neutron emission. Results to date will be presented and a discussion of uncertainties will be given in this presentation. Future plansmore » are to make significant improvements in the fission chambers, neutron detectors, signal processing, data acquisition and the experimental environment to provide high fidelity data including mea urements of fission neutrons below 1 MeV and improvements in the data above 8 MeV.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [2];  [2];  [2];  [2];  [3];  [3]
  1. Los Alamos National Laboratory
  2. CEA-FRANCE
  3. LLNL
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
989836
Report Number(s):
LA-UR-09-03727; LA-UR-09-3727
TRN: US1007167
DOE Contract Number:  
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: 4th Int. Workshop on Nuclear Fissions and Fission Product Spectroscopy ; May 13, 2009 ; Saint Paul les Durance, France
Country of Publication:
United States
Language:
English
Subject:
73; ACTINIDES; DATA ACQUISITION; FAST NEUTRONS; FISSION; FISSION CHAMBERS; FISSION NEUTRONS; FISSION PRODUCTS; LANL; LAWRENCE LIVERMORE NATIONAL LABORATORY; LIQUID SCINTILLATORS; NEUTRON DETECTORS; NEUTRON SOURCES; NEUTRONS; PROCESSING; SPALLATION; SPECTRA; SPECTROSCOPY

Citation Formats

Haight, Robert C, Noda, Shusaku, Nelson, Ronald O, O' Donnell, John M, Devlin, Matt, Chatillon, Audrey, Granier, Thierry, Taieb, Julien, Laurent, Benoit, Belier, Gilbert, Becker, John A, and Wu, Ching - Yen. Fission neutron spectra measurements at LANSCE - status and plans. United States: N. p., 2009. Web.
Haight, Robert C, Noda, Shusaku, Nelson, Ronald O, O' Donnell, John M, Devlin, Matt, Chatillon, Audrey, Granier, Thierry, Taieb, Julien, Laurent, Benoit, Belier, Gilbert, Becker, John A, & Wu, Ching - Yen. Fission neutron spectra measurements at LANSCE - status and plans. United States.
Haight, Robert C, Noda, Shusaku, Nelson, Ronald O, O' Donnell, John M, Devlin, Matt, Chatillon, Audrey, Granier, Thierry, Taieb, Julien, Laurent, Benoit, Belier, Gilbert, Becker, John A, and Wu, Ching - Yen. Thu . "Fission neutron spectra measurements at LANSCE - status and plans". United States. https://www.osti.gov/servlets/purl/989836.
@article{osti_989836,
title = {Fission neutron spectra measurements at LANSCE - status and plans},
author = {Haight, Robert C and Noda, Shusaku and Nelson, Ronald O and O' Donnell, John M and Devlin, Matt and Chatillon, Audrey and Granier, Thierry and Taieb, Julien and Laurent, Benoit and Belier, Gilbert and Becker, John A and Wu, Ching - Yen},
abstractNote = {A program to measure fission neutron spectra from neutron-induced fission of actinides is underway at the Los Alamos Neutron Science Center (LANSCE) in a collaboration among the CEA laboratory at Bruyeres-le-Chatel, Lawrence Livermore National Laboratory and Los Alamos National Laboratory. The spallation source of fast neutrons at LANSCE is used to provide incident neutron energies from less than 1 MeV to 100 MeV or higher. The fission events take place in a gas-ionization fission chamber, and the time of flight from the neutron source to that chamber gives the energy of the incident neutron. Outgoing neutrons are detected by an array of organic liquid scintillator neutron detectors, and their energies are deduced from the time of flight from the fission chamber to the neutron detector. Measurements have been made of the fission neutrons from fission of {sup 235}U, {sup 238}U, {sup 237}Np and {sup 239}Pu. The range of outgoing energies measured so far is from 1 MeV to approximately 8 MeV. These partial spectra and average fission neutron energies are compared with evaluated data and with models of fission neutron emission. Results to date will be presented and a discussion of uncertainties will be given in this presentation. Future plans are to make significant improvements in the fission chambers, neutron detectors, signal processing, data acquisition and the experimental environment to provide high fidelity data including mea urements of fission neutrons below 1 MeV and improvements in the data above 8 MeV.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2009},
month = {1}
}

Conference:
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