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

Conference · Mon May 30 04:00:00 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
• Country of Publication: United States
• Language: English

Related Subjects

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