Radiative cooling of electrons in crystals

An analysis is made of the available experimental data on the energy losses of ultrarelativistic electrons in the germanium crystal. It is shown that an experimentally observed electron energy loss peak in the region of 60-90 percent of the initial electron energy cannot be fully explained on the basis of radiative electron cooling in crystals predicted by Baryshevskii and Dybovskaia (1977). A system of equations describing the effect of radiative electron cooling on the evolution of the full electron energy and the energy of their transverse motion relative to the crystal axes is obtained and solved numerically.