Speaker
Description
Nikolay P. Kalashnikov (kalash@mephi.ru), Andrey S. Olchak (asolchak@mephi.ru)
National Research Nuclear University MEPhI
(Moscow Engineering Physics Institute).
115409 Moscow, Kashirskoye Shosse, 31, Russia
Abstract
The photorecombination process of the axial channeling high-energy electrons is considered. The photorecombination probability of an electron with radiation of the hard photon ħω and an electron transition in the channeling state with energy of the transversal motion ε_(⊥n ) is analyzed. Authors propose to use for considering of this and similar quantum electrodynamics relativistic processes the so called accompanying reference system (ARS), moving parallel to the channeling axis with the velocity, equal to the longitudinal component of the fast particle velocity, V=(p_‖ c^2)/E . In such an accompanying reference system the transversal motion of a particle, entering the single crystal at the angles, not exceeding the critical Lindhard angle θL~√(U_0/E), (where U0 is the effective depth of the axial channeling potential, E»mc2 is the relativistic energy of a penetrating particle) can be considered as non-relativistic up to the very high total energies of the incoming particles, (up to E~1011 eV for leptons). Considering the electron transversal motion with the non-relativistic energies allows employ the familiar standard results from the atomic physics. In particular the cross section calculation of the radiative recombination of electron with atomic row, which шы accompanied by the hard photon emission is presented.
