Measurement of the average multiplicity prompt-fission-neutrons from [238]u(n,f) and [235]u(n,f) from 0.7 to 200 MeV.

Conference · Thu Jan 01 04:00:00 EST 2004

OSTI ID:977875

Ethvignot, T ^[1]; Devlin, M J ^[2]; Granier, T ^[1]; Haight, Robert C; Nelson, R O ^[3]; O'Donnell, J M ^[4]; Rochman, D ^[5]

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1. Thierry
2. Matthew J.
3. Ronald O.
4. John M.
5. Dimitri

Prompt-fission-neutron multiplicities were measured at a 'white' neutron source for the fission of {sup 238}U and {sup 235}U up to 200 MeV. The data are of great importance in the connection of accelerator-coupled nuclear reactor systems incinerating actinides, with uranium considered as a prototype actinide. We report that the fission induced by 200 MeV neutrons produces {approx}10 more prompt neutrons than the fission induced by reactor neutrons. In conclusion, new data on {bar {nu}}{sub p} are reported with errors {<=} 15%. {bar {nu}}{sub p} grows steadily in the fission of {sup 238,235}U induced by neutrons up to 200 MeV. At this energy, it exceeds by {approx}10 the number of neutrons from fission induced by reactor neutrons. Uranium 238 shows enhanced neutron emission compared to uranium 235 due to the higher mass and lower binding energy of the neutrons. In future experiments, we plan to investigate on a much broader range the energy and the angular distributions of the emitted neutrons to improve the precision of the data.

• Research Organization: Los Alamos National Laboratory
• Sponsoring Organization: DOE
• OSTI ID: 977875
• Report Number(s): LA-UR-04-6797
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
ACTINIDES
ANGULAR DISTRIBUTION
BINDING ENERGY
FISSION
MULTIPLICITY
NEUTRON EMISSION
NEUTRON SOURCES
NEUTRONS
PROMPT NEUTRONS
REACTORS
URANIUM
URANIUM 235
URANIUM 238