Quantum-beat and sideband spectra of recoilless γ radiation of ⁵⁷Fe were measured as a function of frequency and the voltage on the quartz crystal on which a ⁵⁷Co source was deposited. The sideband spectra were analyzed using a Rice distribution of the modulation index. The width of this distribution was shown to depend on the frequency; the narrowest distribution was found at 9.795 MHz. The results of the quantum-beat measurements are in agreement with the optical theory of Monahan and Perlow.
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Voorthuysen et al. (1984) studied this question.
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