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

• Main Authors: Barabanov, A. L, Vorobyev, A. S, Gagarski, A. M, Shcherbakov, O. A, Vaishnene, L. A
• Format: Journal Article
• Language: English
• Published: 30-01-2020
• Subjects: Physics - Nuclear Experiment; Physics - Nuclear Theory
• DOI: 10.48550/arxiv.2001.11373

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