CAPTURE-TO-FISSION RATIOS FOR FAST NEUTRONS IN U$sup 23$$sup 5$

Journal Article · Wed Jan 01 04:00:00 EST 1958 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.109.144· OSTI ID:4312483

Diven, B C; Terrell, J; Hemmendinger, A

The ratio alpha = sigma /sub c// sigma /sub f/, where sigma /sub c/ is the neutron captur e cross section and sigma /sub f/ the neutron-induced fission cross section, has been measured for U/sup 235/ as a function of neutron energy. A pulsed and collimated neutron beam is passed through a U/sup 235/ sample at the center of a large liquid scintillator. Captures and fissions are detected by means of their prompt gamma rays; elastic and inelastic scattering events are ignored because of smaller pulse heights. Fissions are distinguished from captures by means of delayed pulses from the capture of thermalized fission neutrons. It is found that in the neutron energy range E/sub n/ = 0.175 to 1.0 Mev the value of alpha is given approximately by alpha = 0.190 to 0.116E/sub n/. The accuracy of the determination of alpha is 10 to 15% in terms of the standand deviation and individual points. (auth)

• Research Organization: Los Alamos Scientific Lab., N. Mex.
• NSA Number: NSA-12-004573
• OSTI ID: 4312483
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 109; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

CAPTURE
CROSS SECTIONS
ENERGY
ENERGY RANGE
ERRORS
FAST NEUTRONS
FISSION
GAMMA RADIATION
MEASURED VALUES
NEUTRON BEAMS
PHYSICS
PULSES
SCATTERING
SCINTILLATION COUNTERS
THERMAL NEUTRONS
URANIUM 235