CapturetoFission Ratios for Fast Neutrons in U^{235}
Abstract
The ratio α=σ_{c}σ_{f}, where σ_{c} is the neutron capture cross section and σ_{f} the neutroninduced fission cross section, has been measured for U^{235} as a function of neutron energy. A pulsed and collimated neutron beam is passed through a U^{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_{n}=0.175 to 1.0 Mev the value of α is given approximately by α=0.1900.116E_{n}. The accuracy of the determination of α is 10 to 15% in terms of the standard deviation of individual points.
 Publication:

Physical Review
 Pub Date:
 January 1958
 DOI:
 10.1103/PhysRev.109.144
 Bibcode:
 1958PhRv..109..144D