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M\"{o}ssbauer spectroscopy is applied to study ultrasound vibration of agranular material. A pile of powder is placed onto the surface of piezotransducer vibrated with the frequency 12.68 MHz. The size of grains (1.3$\mu$m) is much smaller than the wavelength of ultrasound, but much larger thanthe vibration amplitude. Due to vibration a single line of the M\"{o}ssbauertransmission spectrum is split into a comb structure with a period equal to thevibration frequency. This spectrum contains the information about fast and slowmodes in granular dynamics. We developed a method which allows to measure decayof ultrasound in the granular material and to estimate the results of theparticle convection of grains in the pile.

Powder vibration studied by M\"{o}ssbauer spectroscopy