Advanced modeling of prompt fission neutrons

Conference · Thu Jan 01 04:00:00 EST 2009

DOI:https://doi.org/10.1063/1.3258234· OSTI ID:990301

Talou, Patrick ^[1]

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1. Los Alamos National Laboratory

Theoretical and numerical studies of prompt fission neutrons are presented. The main results of the Los Alamos model often used in nuclear data evaluation work are reviewed briefly, and a preliminary assessment of uncertainties associated with the evaluated prompt fission neutron spectrum for n (0.5 MeV)+{sup 239}Pu is discussed. Advanced modeling of prompt fission neutrons is done by Monte Carlo simulations of the evaporation process of the excited primary fission fragments. The successive emissions of neutrons are followed in the statistical formalism framework, and detailed information, beyond average quantities, can be inferred. This approach is applied to the following reactions: {sup 252}Cf (sf), n{sub th} + {sup 239}Pu, n (0.5 MeV)+{sup 235}U, and {sup 236}Pu (sf). A discussion on the merits and present limitations of this approach concludes this presentation.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 990301
• Report Number(s): LA-UR-09-03878; LA-UR-09-3878
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
EVALUATION
EVAPORATION
FISSION
FISSION FRAGMENTS
FISSION NEUTRONS
NEUTRONS
SIMULATION
SPECTROSCOPY