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Information × Registration Number 0216U010222, 0115U005153 , R & D reports Title Development of detector systems for experiments in accelerators and technology for physics accelerators. popup.stage_title Head Shul'ga Nikolai Fedorovich, Доктор фізико-математичних наук Registration Date 23-12-2016 Organization National Science Center "Kharkiv Institute of Physics and Technology popup.description2 Quantum theory is proposed of high energy electrons scattering in ultrathin crystals. This theory is based upon a special representation of the scattering amplitude in the form of the integral over the surface surrounding the crystal, and on the spectral method of determination of the wave function. The comparison is performed of quantum and classical differential scattering cross-sections in the transitional range of crystal thicknesses, from those at which the channeling phenomenon is not developed up to those at which it is realized. It is shown that in this thickness range the quantum scattering cross-section, unlike the classical one, contains sharp peaks corresponding to some specific scattering angles, that is connected with the diffraction of the incident plane wave onto the periodically distributed crystal atomic strings. It is shown that the value of the scattering cross-section in the peaks varies periodically with the change of the target thickness. We note that this must lead to a new interference effect in radiation that is connected with the rearrangement of incident wave packet in transitional area of crystal thicknesses. Product Description popup.authors Кириллін Ігор Володимирович Трофименко Сергій Валерійович Трутень Валентин Іванович Фомін Сергій Петрович Шульга Сергій Миколайович popup.nrat_date 2020-04-02 Close