Mössbauer spectroscopy under acoustical excitation: thick target effects

Abstract

A new model of Mossbauer absorption (transmission) spectra with an adequate analysis of the possible effects of acoustic excitation in the thick targets is proposed. In particular, the dependence of the line width of acoustical satellites on the degree of phase correlation of the sound oscillations of resonant nuclei in the target is established by calculations and confirmed in experiment. Such a model is stimulated by an increase in the informativeness of the Mossbauer experiments, using thick samples in ultrasound (US) field, and by possible applications of this research technique. The test measurements of Mossbauer absorption spectra on stainless steel are carried out. The fitting of these spectra confirms the relevance of modifications of the model base of Mossbauer processes in US field.