| Abstract: | Tuning of gamma radiation by exciting the ultrasonic vibrations of different coherency degree in crystals is discussed. The
quantum approach based on the formalism of coherent quantum states is used to take into account statistical properties of
the stimulating ultrasonic wave. Multi-quantum transitions with emission of gamma quanta and simultaneous stimulated emission
of recoil phonons or absorption of one or several phonons from an external ultrasonic wave are considered as an example of
multi-quantum transitions with quanta coupled to different degrees of freedom of the radiating nuclei. The spectrum of gamma
radiation is determined for a partially coherent stimulating ultrasonic wave with fixed amplitude and uncertain phase, and
completely incoherent casual acoustic oscillations. A comparison is made with some known results obtained by both classical
and quantum methods.
This revised version was published online in August 2006 with corrections to the Cover Date. |
