Abstract
The neutron fission cross section of 235U has been measured relative to the n-p scattering cross section at a number of neutron energies in the range 0·04–4 MeV to an accuracy of about 3 per cent. Hydrogen and methane gas proportional counters and a Polyethylene radiator semiconductor counter were used as recoil proton flux measuring instruments in the appropriate parts of this neutron energy range. Good agreement was obtained between the shapes of the recoil proton spectra and those calculated. The effect of neutron scattering and the loss of fission fragments in the uranium foil were investigated experimentally. At 1·0, 2·25 and 14·1 MeV the present results agree reasonably well with a currently accepted best curve through previous measurements of this cross section (BNL-325). At energies less than 500 keV however the cross sections measured here are about 7 per cent below this curve and at an isolated measurement at 5·4 MeV the present result is 1 l per cent below previous measurements.
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Schedule a callMore From: Journal of Nuclear Energy. Parts A/B. Reactor Science and Technology
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