Neutron Induced Fission Cross Section Ratios for ²³²Th, ^235,238U, ²³⁷Np, and ²³⁹Pu from 1 to 400 MeV

Conference · Mon May 30 00:00:00 EDT 1988

OSTI ID:6967752

Lisowski, P. W. ^[1]; Ullmann, J. L. ^[1]; Balestrini, S. J. ^[1]; Carlson, A. D. ^[2]; Wasson, O. A. ^[2]; Hill, N. W. ^[3]

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1. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
2. National Bureau of Standards, Washington, DC (United States)
3. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Time-of-flight measurements of neutron induced fission cross section ratios for ²³²Th, ^235,238U, ²³⁷Np, and ²³⁹Pu, were performed using the WNR high intensity spallation neutron source located at Los Alamos National Laboratory. A multiple-plate gas ionization chamber located at a 20-m flight path was used to simultaneously measure the fission rate for all samples over the energy range from 1 to 400 MeV. Because the measurements were made with nearly identical neutron fluxes, we were able to cancel many systematic uncertainties present in previous measurements. This allows us to resolve discrepancies among different data sets. In addition, these are the first neutron-induced fission cross section values for most of the nuclei at energies above 30 MeV.

• Research Organization: National Bureau of Standards, Washington, DC (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6967752
• Report Number(s): LA-UR-88-1813; CONF-880546-31; ON: DE88014460
• Resource Relation: Conference: International Conference on Nuclear Data for Science and Technology , Mito (Japan), 30 May - 3 Jun 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
NEPTUNIUM 237 TARGET
NEUTRON REACTIONS
PLUTONIUM 239 TARGET
THORIUM 232 TARGET
URANIUM 235 TARGET
URANIUM 238 TARGET
CROSS SECTIONS
ENERGY DEPENDENCE
FISSION
FISSION SPECTRA
IONIZATION CHAMBERS
NEUTRON FLUENCE
TIME-OF-FLIGHT METHOD
BARYON REACTIONS
HADRON REACTIONS
MEASURING INSTRUMENTS
NUCLEAR REACTIONS
NUCLEON REACTIONS
RADIATION DETECTORS
SPECTRA
TARGETS
Nuclear Criticality Safety Program (NCSP)
Time-of-Flight Measurements
WNR High Intensity Spallation Neutron Source
Cross Sections
652020* - Nuclear Properties & Reactions
A=220 & above
Experimental