ANGULAR DISTRIBUTION OF PROMPT FISSION γ-RAYS
Ahmadov G. Berikov D. Kopatch Y.
2023Publishing House of the Romanian Academy
Romanian Reports in Physics
2023#75Issue 1
The angular distributions of prompt-fission γ-rays with respect to the direction of fission fragments in the monochromatic “warm” neutron induced fission of235 U have been studied. The fragments were detected with low-pressure position sensitive multi-wire proportional counter and the gamma-rays with a plastic scintilla-tors. The time-of-flight method is used to discriminate prompt neutrons and prompt γ-rays of fission. From the measured angular distributions with respect to the direction of the selected fragments, the value of the laboratory anisotropy has been found to be 15 % in comparison to the value obtained in the perpendicular direction. The measurements indicate the existence of a significant anisotropy of emission of the γ-rays in the emitting-fragment system, suggesting the presence of significant angular momenta of the fragments correlated with the fission axis, which also lead to an enhanced emission of the γ-rays. Moreover, the article includes a new technique for measuring and cor-recting the obtained angular distribution, in the case of when plastic scintillators have different threshold levels for detection of γ-rays.
angular anisotropy , angular distributions of the prompt γ-rays of fission , Neutron induced fission of235 U
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Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Joliot-Curie 6, Dubna, 141980, Russian Federation
Azerbaijan National Academy of Sciences-CSSR and IRP, Istiglaliyyat 30, Baku, AZ1001, Azerbaijan
National Nuclear Research Center, Inshaatchilar 4, Baku, AZ1073, Azerbaijan
Institute of Nuclear Physics of the National Nuclear Center of Kazakhstan, Ibragimova 1, Almaty, 050032, Kazakhstan
Frank Laboratory of Neutron Physics
Azerbaijan National Academy of Sciences-CSSR and IRP
National Nuclear Research Center
Institute of Nuclear Physics of the National Nuclear Center of Kazakhstan
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