Rotation effect of a fissile nucleus (ROT effect) for prompt γ-rays in binary fission of 235U by polarized neutrons of different energies
Berikov D. Ahmadov G. Kopatch Yu. Gagarski A. Danilyan G. Chuprakov I. Ahmadov F. Mendibayev K. Nuruyev S.
1 July 2025Institute of Physics
Chinese Physics C
2025#49Issue 7
This article describes a series of studies on the effect of the rotation of the fissile 236U nucleus in the 235U(n,f) process induced by monochromatic polarized neutrons with energies of 62 meV and 270 meV. The studied effect is expressed as a shift in the anisotropic angular distribution of γ-rays emitted by excited fission fragments by a small angle relative to the deformation axis of the fissile nucleus when the neutron beam polarization direction is reversed. All measurements were performed at the Heinz Mayer-Leibniz research neutron source (FRM II reactor) of the Munich Technical University in Garching on the polarized neutron beam of the POLI instrument. To generalize all results obtained on ROT effects for fission γ-rays, the results of earlier studies by the ITEP group for cold neutrons are re-processed, and the result obtained by the PNPI group for thermal neutrons is also presented.
angular anisotropy , angular distribution of prompt γ-rays , binary fission , neutron-induced fission , ROT effect , rotation angle of the fission axis
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Institute of Nuclear Physics, the Ministry of Energy of the Republic of Kazakhstan, Ibragimova 1, Almaty, 050032, Kazakhstan
Joint Institute for Nuclear Research, Joliot-Curie 6, Dubna, 141980, Russian Federation
Innovation and Digital Development Agency Nuclear Research Department, Gobu str. 20th km of Baku-Shamakhi Highway, Baku, AZ1021, Azerbaijan
Institute of Radiation Problems under Ministry of Science and Education, B.Vahabzade str. 9, Baku, AZ1143, Azerbaijan
Institute for Theoretical and Experimental Physics, National Research Centre “Kurchatov Institute”, Bolschaja Cheremuskinskaja 25, Moscow, 117218, Russian Federation
Khazar University, 41 Mahsati Str., Baku, AZ1096, Azerbaijan
Azerbaijan University of Architecture and Construction, Ayna Sultanova St. 5, Baku, AZ1073, Azerbaijan
Institute of Nuclear Physics
Joint Institute for Nuclear Research
Innovation and Digital Development Agency Nuclear Research Department
Institute of Radiation Problems under Ministry of Science and Education
Institute for Theoretical and Experimental Physics
Khazar University
Azerbaijan University of Architecture and Construction
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