Mass distribution in 11.3 MeV neutron-induced fission of 238U

Fission product yields for 40 mass chains were determined for the fission of 238U induced by 11.3 MeV neutron for the first time. Absolute fission rate was monitored with a double-fission chamber. Fission product activities were measured by HPGe or Ge(Li) γ-ray spectrometry of irradiated 238U foils and by chemical separation of the fission product elements followed by β-counting and/or γ-ray spectrometry. Time of flight technique was used to measure the neutron spectrum in order to estimate the fission events induced by break-up neutrons and scattering neutrons. A complete mass distribution curve has been obtained and dependence of fission yield with neutron energy is discussed