Abstract
The experimental data on the angular distributions of fragments from the fission of 237Np nuclei induced by 1–200 MeV neutrons have been presented. Such measurements for neutron energies above 16 MeV have been performed for the first time. These distributions have been analyzed and the angular anisotropy in the center-of-mass of fragments has been determined in the entire energy range under study. A method involvng the complex dynamics of the formation and decay of highly excited nuclei and based on the TALYS program has been proposed to calculate the angular distributions of fission fragments in a wide energy range for the collision of nuclei with neutrons. It has been shown that the developed model describes well the main features of the energy dependence of the angular anisotropy for the 237Np target nuclei and can be used to extract new information on the reaction and fission process.
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Acknowledgments
We are grateful to E.M. Ivanov and the staff of the Accelerator Department, Petersburg Nuclear Physics Institute, for their permanent friendly assistance and smooth operation of the synchrocyclotron during the experiment and to T.E. Kuz’mina (Khlopin Radium Institute, St. Petersburg, Russia) for cooperation in the preparation of high-quality actinide targets.
Funding
This work was supported in part by the Russian Foundation for Basic Research (project no. 18-02-00571).
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Russian Text © The Author(s), 2019, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 110, No. 4, pp. 222–229.
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Vorobyev, A.S., Gagarski, A.M., Shcherbakov, O.A. et al. Angular Distributions and Anisotropy of Fragments from the Neutron-Induced Fission of 237Np in the Energy Range of 1–200 MeV: Measurement Data and Model Calculations. Jetp Lett. 110, 242–249 (2019). https://doi.org/10.1134/S0021364019160124
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DOI: https://doi.org/10.1134/S0021364019160124