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Information × Registration Number 0224U033481, (0123U102981) , R & D reports Title Influence of a supercritical magnetic field on spin-polarization effects in the processes of quantum electrodynamics popup.stage_title Теоретичне дослідження спін-поляризаційних ефектів резонансного процесу комптонівського розсіювання в надкритичному магнітному полі Head Diachenko Mykhailo M., к.ф.-м.н. Registration Date 28-12-2024 Organization Institute of Applied Physics National Academy of Sciences of Ukraine popup.description1 Development of a theory of quantum electrodynamics processes, specifically photoproduction of an electron-positron pair, synchrotron radiation, and Compton scattering, taking into account spin-polarization effects in a supercritical magnetic field. popup.description2 A study of the Compton scattering process of a photon on an electron in an external magnetic field has been conducted. Analytical expressions for the amplitude and cross-section of the process for arbitrarily polarized particles have been derived. A resonant process was investigated, where the intermediate particle reaches the mass shell. A special case was considered where the process amplitude is determined by only one Feynman diagram, and photons propagate perpendicularly to the magnetic field. In this case, the initial and final electrons are in the ground spin state and the lowest Landau level, while the intermediate electron is in the first excited state. It was demonstrated that the process cross-section does not factorize, in contrast to the non-relativistic approximation. It was found that the degree of radiation polarization equals unity, meaning the radiation is fully polarized. The analysis of the polarization properties of the process showed that if the initial photon has normal or anomalous linear polarization, the final photon will have the same type of polarization. If the initial radiation is linearly polarized at an angle of 45 degrees, the polarization of the final photon will depend on the frequency of the initial photon and the value of the magnetic field strength. In the case of right- or left-handed circular polarization of the initial photon, the polarization of the radiation will be a sum of right- or left-handed circular and normal linear polarizations. It was shown that there is an asymmetry in the process cross-section relative to the resonance frequency, which decreases with an increase in the magnetic field strength. Moreover, increasing the magnetic field reduces the resonance cross-section of the process. Product Description popup.authors Diachenko Mykhailo M. Lebedynska Yuliia S. Serhii O. Lebedynskyi popup.nrat_date 2024-12-28 Close