[en] The complete pumping of spherical X radiation in crystals affected by exterior effects is theoretically investigated

[en] The phenomenon of focusing and defocusing of diffracted X radiation with different wave fronts in crystals under the action of temperature gradient and ultrasonic oscillations has been investigated in detail

[en] The oscillating time dependence of the γ- or X-ray diffracted beam intensity induced by piezoelectric crystal vibrations has been studied. To find the intensities of the scattered and transmitted beams, Takagi's equations are used and solved numerically. The time dependence of diffracted beam intensity and the intensity dependence on ultrasound wave amplitude are plotted and discussed. The intensity has an oscillating character and the number of beats in one period increases with the increase of vibration amplitude

[en] The parametric x-ray radiation and the influence of acoustic fields on the intensity of parametric x-ray radiation are investigated, using the extracted 20 MeV electron beam of the linear accelerator LEA-50 of the Yerevan Physics Institute. The energy and angular distributions of specific parametric x-ray radiation yields of electrons in quartz single crystals are obtained. The parametric x-ray radiation intensity gain under the influence of ultrasonic vibrations is registered that confirms the validity of theoretical calculations and previous experimental data

[en] Certain problems are considered of the X-ray radiation diffraction in oscillating crystals within the framework of the Takagi strict dynamic theory, both, in the case of one-dimensional deformation and in the case of a two-dimensional one. (author)