Abstract
The number of prompt neutrons emitted from single fragments ( v) as well as from both fragments together ( v T) was measured in coincidence with the kinetic energy of both fission fragments. For this reason the fission sources were placed at the edge and in the middle of a large, gadolinium- loaded liquid scintillation counter, respectively. Thus neutron multiplicity distributions could be formed as a function of fragment mass and total kinetic energy. Their mean values and variances are compared with existing data. We found that the well known increase of the variance of v T (when averaged over all masses and energies of the fragments) with the mass of the fissioning nuclei is not caused by the increase of symmetric fission, because with 252Cf σ 2( v T) is greater for all mass ratios than with 244Cm. The slope and shape of v T as a function of the total kinetic energy were also obtained.
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