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Information × Registration Number 0126U000737, R & D request Title Electrodynamic and nuclear processes in fast particle passage through matter Head Serhii Fomin, Кандидат фізико-математичних наукIgor Kyryllin, Доктор фізико-математичних наук Registration Date 25-01-2026 Organization National Science Center "Kharkiv Institute of Physics and Technology" popup.description1 The aim of the work is to develop a theory for a range of electrodynamic and nuclear processes occurring in fast charged and neutral particle passage through matter. Specifically, the study aims to: investigate interference effects in the characteristic X-ray radiation of an electron-positron pair, associated both with the interference of the particles' fields and with the reconfiguration of the pair's field after its emission from the target where it is produced; examine the dependence of ionization energy loss distributions for particles moving in the channeling mode within a crystal on the particle energy and crystal thickness, and to conduct a comparative analysis of these distributions at a fixed ratio of crystal thickness to dechanneling length; advance the theory of relativistic electron radiation in matter and external fields; determine the dependence of the efficiency of fast charged particle deflection by a bent axially oriented crystal on the potential shape of atomic strings; study the dependence of spectral distributions of coherent radiation from electrons with energies on the order of 1 GeV under various crystal motion regimes: planar or axial channeling and above-barrier motion, and to analyze how the spectral characteristics of such radiation depend on the crystal thickness; derive the dependence of the differential scattering cross-section of fast charged particles in the field of atomic planes of an oriented crystal on the momentum transfer at various angles of incidence; further develop the theory of the slow nuclear burning phenomenon in a multiplying medium and to determine the optimal core parameters for a fast breeder reactor operating in the nuclear burning wave mode to prevent excessively high neutron fluence and power density. popup.nrat_date 2026-01-25 Close