Abstract
An experiment on 252Cf (spontaneous fission) has been performed taking the kinetic energies of both correlated fragments and the velocity of one of them. The detectors were of the surface barrier type. Pre- and post-neutron emission data for fragment masses, energies and velocities as well as the prompt neutron number vs fragment mass are obtained. The main aim was to find accurate mean values for the above quantities. The evaluation shows that widely accepted energy calibration schemes for surface barrier detectors yield too high kinetic energies for fission fragments, the discrepancy being at the 1% level. The mean total kinetic energy release in 252Cf (sf) before and after prompt neutron evaporation is observed to be 〈E tot ∗ = 184.07 ± 1.3 MeV and 〈 E tot〉 = 181.25 ± 1.3 MeV, respectively.
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