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We apply the four-dimensional Langevin approach to the description of fission of  235 U by neutrons and calculate the dependence of the excitation energy of fission fragments on their mass number. For this we run the Langevin equations until the compound nucleus splits into two separated fragments. This is possible since the we used in this work two-center shell model shape parametrization that describes well both compact and separated shapes. The excitation energies of each fragment are calculated assuming that the temperatures of both fragments are the same. The deformation energy of the fragment immediately after scission is added to its excitation energy. The saw-tooth structure of the dependence neutron multiplicity on the fragment’s mass number in reaction  235 U + n at  E   n   = 5 Mev is qualitatively reproduced.

The description of the excitation energy sharing in nuclear fission within the Langevin approach