Measurement of the Uranium-235 Fission Cross Section over the Neutron Energy Range 1 to 6 MeV

D. M. Barton; B. C. Diven; G. E. Hansen; G. A. Jarvis; P. G. Koontz; R. K. Smith

doi:dx.doi.org/10.13182/NSE76-A26898

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Measurement of the Uranium-235 Fission Cross Section over the Neutron Energy Range 1 to 6 MeV

D. M. Barton, B. C. Diven, G. E. Hansen, G. A. Jarvis, P. G. Koontz, R. K. Smith

Nuclear Science and Engineering / Volume 60 / Number 4 / August 1976 / Pages 369-382

Technical Paper / dx.doi.org/10.13182/NSE76-A26898

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The ratio of the fission cross section of ²³⁵U to the scattering cross section of ¹H has been measured in the 1- to 6-MeV range using monoenergetic neutrons from a pulsed ³H(p, n)³He source. In this measurement, solid-state detectors determined fission fragment and recoil proton emissions from back-to-back U(99.7%) and polyethylene disks. Timing permitted discrimination against room-scattered neutron backgrounds. Absolute values for ²³⁵U(n, f) are obtained using the Hopkins-Breit evaluation of the hydrogen-scattering cross section.