V. Petržílka

Applications of methods and results of neutron diffraction by vibrating single crystals

Abstract In this paper possibilities of application of phenomena observed in the course of investigations concerning diffraction of neutrons by vibrating lattices of single crystals are described.

Neutron diffraction by a single crystal of iron excited by means of a magnetostrictive resonator

Abstract Neutron diffraction experiments by a single crystal of iron excited by means of a magnetostrictive resonator show a significant increase of the mean intensity of diffracted neutrons compared to that of a non-vibrating crystal and also a time modulation of a diffracted neutron beam.

Some experiments of neutron diffraction by flexurally vibrating and elastically bent Si single crystals

Abstract In this paper the neutron diffraction by lattices of Si single crystals for the sake of monochromator design was investigated and, for this purpose, it was performed on flexurally vibrating Si perfect single crystals and - for comparison - on a statically bent sample of Si. A significant increase of the integrated intensity of diffracted neutrons in the symmetric Bragg reflection condition was observed and measured in case of a vibrating Si crystal in dependence on the periodic elastic stress or displacement, in the case of the elastically bent crystal as a function of the radius of curvature.

Effects of thickness-shear vibrations on neutron diffraction by quartz single crystals

The influence of thickness-shear vibrations on the process of neutron diffraction by the lattice of quartz single crystals is investigated. Qualitative interpretation of the experimental data is carried out on the basis of the dynamical theory of neutron diffraction by vibrating single crystals.

Phase shift in the time spectrum of neutrons diffracted by a vibrating single crystal

Abstract In this paper the time modulation of neutrons diffracted by a longitudinally vibrating bar shaped quartz single crystal was investigated. The phase shift of the neutron time spectrum with respect to the absolute value of the sinusoidally varying strain of the vibrating sample was observed.