Level mixing induced transparency |
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| Authors: | R. N. Shakhmuratov J. Odeurs S. Gheysen Y. Rostovtsev O. Kocharovskaya P. Mandel |
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| Affiliation: | (1) Instituut voor Kern-& Stralingsfysica, Katholieke Universiteit Leuven, Celestijnenlaan 200 D, B-3001 Leuven, Belgium;(2) Kazan Physical Technical Institute, Russian Academy of Sciences, Sibirsky Trakt 10/7, Kazan, 420029, Russia;(3) Department of Physics and Institute for Quantum Studies, Texas A&M University, College Station, TX 77843-4242, USA;(4) Optique Nonlinéaire Théorique, Université Libre de Bruxelles, Campus Plaine CP 231, Bld du Triomphe, B-1050 Bruxelles, Belgium |
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| Abstract: | We discuss level mixing induced transparency (LMIT), which is experimentally found in a thick absorber of FeCO3 containing the 57Fe Mössbauer nuclei. LMIT is observed if two hyperfine levels of the excited state nucleus cross. Absorption of gamma radiation drops by about 25% with respect to the sum of two overlapping absorption lines. The absorption deficit is explained by the mixing of the crossing levels with a symmetry breaking interaction. The level mixing induces a polarization change of the scattered radiation. In such a way, the radiation develops in “normal modes,” which are less absorbed in a thick absorber. We show that, in spite of the absorption drop, the area of the absorption line does not change. This confirms the general knowledge that interference phenomena (destructive or constructive) do not change the lifetime of an excited state particle (atom, nucleus, etc). |
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