Studies of the Fission Integrals of U235 and Pu239 with Cadmium and Boron Filters

摘要

The resonance fissions in U235 and Pu239 have been studied using cadmium and boron filters. Fission chambers were used as detectors and the experiments were performed in beam geometry. The neutron energy distribution in the beams transmitted through the different filters was determined with a fast chopper.nFrom the cadmium filter measurements the fission resonance integrals were determined. The values obtained were 278 - 9 b for U235 and 301 t 10 b for Pu239;0.5 eV < E < 1 MeV.