Effect of rotation in the γ-ray emission from 60 meV polarized neutron-induced fission of the U 235 isotope

Berikov D. Ahmadov G. Kopatch Yu. Gagarski A. Novitsky V. Deng H. Danilyan G. Masalovich S. Salhi Z. Babcock E. Klenke J. Hutanu V.
August 2021 American Physical Society

Physical Review C
2021 #104 Issue 2

In the paper we present the results obtained for the effect of rotation (ROT) in the angular distribution of prompt γ rays from the fission of U235 induced by monochromatic polarized warmneutrons (En = 60 meV). The polarization vector direction is determined at the target position in order to correctly determine the sign of the measured effect. The asymmetry parameter was found to be equal to Rγ=-(17.3±2.8)×10-5. Moreover, the rotation angle of the fission axis was determined to be equal to 0.069 ±0.008 taking into account the fit results of the angular distribution of the prompt fission γ rays. The obtained value and sign of the ROT effect are consistent with the results of the ROT effect obtained for cold neutrons. We describe the experiment, methodology of sign determination, and implications of the results.

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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, 141980, Russian Federation
Institute of Nuclear Physics, National Nuclear Center of Kazakhstan, Almaty, 050032, Kazakhstan
Azerbaijan National Academy of Sciences-CSSR, IRP, Baku, AZ1143, Azerbaijan
Department of Nuclear Physics, National Nuclear Research Center, Baku, AZ1073, Azerbaijan
Institute for Theoretical and Experimental Physics, National Research Centre, Kurchatov Institute, Moscow, 117218, Russian Federation
Petersburg Nuclear Physics Institute, National Research Centre, Kurchatov Institute, Leningradskaya Oblast, 188300, Russian Federation
Institute of Crystallography, RWTH Aachen, Jülich Centre for Neutron Science, Heinz Maier-Leibnitz Zentrum (MLZ), Garching, 85748, Germany

Frank Laboratory of Neutron Physics
Institute of Nuclear Physics
Azerbaijan National Academy of Sciences-CSSR
Department of Nuclear Physics
Institute for Theoretical and Experimental Physics
Petersburg Nuclear Physics Institute
Institute of Crystallography

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