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RADIATION AND ELECTRON-POSITRON PAIR GENERATION IN A STRONG MAGNETIC FIELD
Novak Oleksandr P.
Кандидат фізико-математичних наук
Institute of Applied Physics
Старший науковий співробітник
The series of the works consists of 8 papers, including 4 articles and 4 reports in proceedings of scientific conferences. The aim of the research is theoretical study of spin and polarization effects in the processes of magneto-bremsstrahlung and photoproduction of an electron-positron pair in a strong magnetic field, and study of the process of electron-positron pair production by an electron in a magnetic field. The following fundamental results have been obtained: Probability of high energy photon radiation with flip of initial electron spin is comparable with probability of no-spin-flip process if the radiating electron has relativistic energy. Spin orientation of the particles produced in the photoproduction process substantially depends on their energy. In the case of weakly exited electrons their spins are mostly oriented against magnetic field, while spins of strongly exited electrons orient mostly along magnetic field. The polarization degree of electrons and positrons substantially depends on initial photon polarization. Spin and polarization effects result in increasing of synchrotron radiation intensity of X-ray pulsar magnetosphere if particles occupy low energy levels, while the intensity decreases if particles have relativistic energies. The expressions for the rate of the process of electron-positron pair production by an electron in a magnetic field near the process threshold with account of particles spins are obtained. It is shown that the process is more probable when initial electron spin is oriented along magnetic field. The results of the series extend understanding of physics of X-ray pulsar magnetosphere and influence of spin and polarization effects on the intensity of X-ray pulsar radiation in the vicinity of cyclotron lines. The obtained results can be used in research centres throughout the world in experiments on test of quantum electrodynamics in strong external electromagnetic fields. Research results are presented in 8 works including 4 articles in reviewed journals. The works have 12 citations according to Scopus, h-index is 2.
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