The Fission Cross Sections Of U233 U234 U235 U236 Np237 Pu239 Pu240 And Pu241 For 24 Kev Neutrons

Neutron cross-section sets have been prepared for 16 elements or isotopes for neutron energies from 0.037 ev to 18 Mev. The cross sections tabulated include the total, elastic, inelastic, (n,2n), and fission cross sections, as well as cross sections for charged particle emission. Information is also given on the angular distribution of elastically scattered neutrons and on the energy distribution of neutrons and gamma rays following nonelastic scattering. (Author).

The measurement of the fission cross section ratios of nine isotopes relative to 235U at an average neutron energy of 14.74 MeV is described with particular attention to the determination of corrections and to sources of error. The results are compared to ENDF/B-V and to other measurements of the past decade. The ratio of the neutron induced fission cross section for these isotopes to the fission cross section for 235U are: 23°Th - 0.290 +- 1.9%; 232Th - 0.191 +- 1.9%; 233U - 1.132 +- 0.7%; 234U - 0.998 +- 1.0%; 236U - 0.791 +- 1.1%; 238U - 0.587 +- 1.1%; 237Np - 1.060 +- 1.4%; 239Pu - 1.152 +- 1.1%; 242Pu - 0.967 +- 1.0%. 40 refs., 11 tabs., 9 figs.