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In recent years, investigations of angular distributions of fragments inneutron-induced nuclear fission have been extended to intermediate energies, upto 200 MeV, as well as to a wide range of target isotopes. Using as an examplethe latest data obtained by our group for the reaction 237-Np(n,f), we discussthe specific features of fission fragment angular distribution and present amethod for their simulation based on the code TALYS. It is shown that asimplified model reasonably describes energy dependence of the angulardistribution in the whole range 1-200 MeV. The ways to improve the model arediscussed along with the possibilities to use it for obtaining new informationon fission and pre-equilibrium processes in neutron-nucleus interaction. Weconsider also the relevant problems of describing fission fragment angulardistributions.

Angular distribution of fragments in neutron-induced nuclear fission at energies 1-200 MeV: data, theoretical models and relevant problems