Abstract
The neutron-induced fission cross section of Cf252 was measured from 20-eV to 5-MeV neutron energy, using neutrons from the Physics-8 nuclear explosion. Pronounced sub-barrier resonance fission is observed below a few keV neutron energy. The fission threshold is found to occur at ∼900 keV. Analysis of the data indicates that the fission barrier is quite transparent, giving an average fission width comparable to the value of 0.02-0.05 eV expected for the average radiative capture width in the resonance region.
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