Abstract
A statistical model of the scission mechanism is reported; the fission fragments are described as two nuclear droplets at given temperature and distance. The canonical formalism is introduced in order to describe the states of the system; the intrinsic degrees of freedom, representing both proton and neutron repartitions in a given pair A1, A2 and the various possible configurations assumed by the excited nucleons are considered to be in statistical equilibrium. The degrees of freedom related to the collective motion of nucleons, which means to the fragment kinetic energies, are not assumed to be in statistical equilibrium. The partial equilibrium model has been applied to the calculations of fragment excitation energies and to the analysis of the fragment charge distributions. 235U fission induced by thermal neutrons has been analysed.
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