Crystal spectrometer for measuring slow neutron small angle scattering

The double-crystal neutron spectrometer is designed for measurements of the microstructure of solid matter using the small-angle diffraction of slow neutrons. The efficiency of experimental data collection can be increased by the use of vibrating single crystals which enable the angular dependence of the diffracted neutrons to be transformed into the time dependence; moreover, the aperture of the instrument is increased by as much as two orders of magnitude. The operating costs are thereby also considerably reduced. Platelets of perfect silicon and germanium single crystals are best suited to practical application. (Z.S.). 2 figs