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A significant reduction of absorption for single gamma photons has been experimentally observed by studying M\"ossbauer spectra of ⁵⁷Fe in a FeCO₃ crystal. The experimental results have been explained in terms of a quantum interference effect involving nuclear level anticrossing due to the presence of a combined magnetic dipole and electric quadrupole interaction.
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Coussement et al. (2002) studied this question.
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