Neutron-Induced Fission Cross Section Measurements for Uranium Isotopes and Other Actinides at LANSCE

Conference · Thu Aug 16 00:00:00 EDT 2012

OSTI ID:1048380

Laptev, Alexander B ^[1]; Tovesson, Fredrik K ^[1]; Hill, Tony S ^[1]

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1. Los Alamos National Laboratory

A well established program of neutron-induced fission cross section measurement at Los Alamos Neutron Science Center (LANSCE) is supporting the Fuel Cycle Research program (FC R&D). The incident neutron energy range spans from sub-thermal up to 200 MeV by combining two LANSCE facilities, the Lujan Center and the Weapons Neutron Research center (WNR). The time-of-flight method is implemented to measure the incident neutron energy. A parallel-plate fission ionization chamber was used as a fission fragment detector. The event rate ratio between the investigated foil and a standard {sup 235}U foil is translated into a fission cross section ratio. Thin actinide targets with deposits of <200 {micro}g/cm{sup 2} on stainless steel backing were loaded into a fission chamber. In addition to previously measured data for {sup 237}Np, {sup 239-242}Pu, {sup 243}Am, new measurements include the recently completed {sup 233,238}U isotopes, {sup 236}U data which is being analyzed, and {sup 234}U data acquired in the 2011-2012 LANSCE run cycle. The new data complete the full suite of Uranium isotopes which were investigated with this experimental approach. When analysis of the new measured data is completed, data will be delivered to evaluators. Having data for multiple Uranium isotopes will support theoretical modeling capabilities and strengthens nuclear data evaluation.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: DOE/LANL
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1048380
• Report Number(s): LA-UR-12-23959; TRN: US1204178
• Resource Relation: Conference: 22nd Intl. Conf. on the Application of Accelerators in Research and Industry ; 2012-08-05 - 2012-08-10 ; Fort Worth, Texas, United States
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
43 PARTICLE ACCELERATORS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ACTINIDES
CROSS SECTIONS
ENERGY RANGE
EVALUATION
FISSION
FISSION CHAMBERS
FISSION FRAGMENTS
FUEL CYCLE
IONIZATION CHAMBERS
NEUTRONS
RESEARCH PROGRAMS
STAINLESS STEELS
TARGETS
TIME-OF-FLIGHT METHOD
URANIUM ISOTOPES
WEAPONS