Prompt fission neutron spectra from fission induced by 1 to 8 MeV neutrons on {sup 235}U and {sup 239}Pu using the double time-of-flight technique

Journal Article · Tue Mar 15 00:00:00 EDT 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.034604· OSTI ID:21499498

Noda, S; Haight, R C; Nelson, R O; Devlin, M; O'Donnell, J M; Chatillon, A; Granier, T; Belier, G; Taieb, J; Kawano, T; Talou, P ^[1]

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1. Los Alamos Neutron Science Center, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

Prompt fission neutron spectra from {sup 235}U and {sup 239}Pu were measured for incident neutron energies from 1 to 200 MeV at the Weapons Neutron Research facility (WNR) of the Los Alamos Neutron Science Center, and the experimental data were analyzed with the Los Alamos model for the incident neutron energies of 1-8 MeV. A CEA multiple-foil fission chamber containing deposits of 100 mg {sup 235}U and 90 mg {sup 239}Pu detected fission events. Outgoing neutrons were detected by the Fast Neutron-Induced {gamma}-Ray Observer array of 20 liquid organic scintillators. A double time-of-flight technique was used to deduce the neutron incident energies from the spallation target and the outgoing energies from the fission chamber. These data were used for testing the Los Alamos model, and the total kinetic energy parameters were optimized to obtain a best fit to the data. The prompt fission neutron spectra were also compared with the Evaluated Nuclear Data File (ENDF/B-VII.0). We calculate average energies from both experimental and calculated fission neutron spectra.

• OSTI ID: 21499498
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 3; Other Information: DOI: 10.1103/PhysRevC.83.034604; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
DEPOSITS
FAST NEUTRONS
FISSION
FISSION CHAMBERS
FISSION NEUTRONS
FOILS
GAMMA RADIATION
KINETIC ENERGY
MEV RANGE
NUCLEAR DATA COLLECTIONS
PHOSPHORS
PLUTONIUM 239
SPALLATION
SPECTRA
TIME-OF-FLIGHT METHOD
URANIUM 235
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BARYONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
ENERGY
ENERGY RANGE
EVEN-ODD NUCLEI
FERMIONS
HADRONS
HEAVY NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZATION CHAMBERS
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
NEUTRON DETECTORS
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PLUTONIUM ISOTOPES
RADIATION DETECTORS
RADIATIONS
RADIOISOTOPES
SPONTANEOUS FISSION RADIOISOTOPES
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES