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Bulletin of the Russian Academy of Sciences Physics

Quantum interference effects of γ radiation under crossing-anticrossing of nuclear levels in an RF field

Sh. Sh. Bashkirov, V. Yu. Lyubimov, E. A. Popov, В. А. Белавин, Svetlana M. Kutsenko

Published Sep 1, 2007• 1 citation
Publisher

Abstract

The quantum interference effects occurring in resonant scattering of a γ photon in the multilevel γ-optical medium 57 Fe, affected by an external RF field, have been theoretically investigated. It is shown that a significant reconstruction of the hyperfine structure of nuclear states leads to the interference of partial forwardscattering amplitudes of a γ photon and, therefore, to a significant change in the nuclear refractive index of the γ-optical medium, depending on the amplitude, frequency, and phase of the external RF field. The conditions are found under which the effect of electromagnetically induced transparency can be observed in the technique of in-phase detection of γ photons.

DOI
10.3103/s1062873807090031

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Bulletin of the Russian Academy of Sciences Physics•Sep 1, 2007•0 citations
The quantum interference effects occurring in resonant scattering of a γ photon in the multilevel γ-optical medium 57 Fe, affected by an external RF field, have been theoretically investigated. It is shown that a significant reconstruction of the hyperfine structure of nuclear states leads to the interference of partial forwardscattering amplitudes of a γ photon and, therefore, to a significant change in the nuclear refractive index of the γ-optical medium, depending on the amplitude, frequency, and phase of the external RF field. The conditions are found under which the effect of electromagnetically induced transparency can be observed in the technique of in-phase detection of γ photons.
A new approach to observing the effect of electromagnetically induced transparency in gamma optics is proposed. The propagation of a resonant photon in a 57 Fe magnetic medium in an applied rf field is considered for this purpose. It is shown that, under crossing-anticrossing conditions, a resonant rf field substantially changes the gamma-optical properties of the medium, which become dependent on the parameters of the field. This opens the possibility for exercising a coherent control of the photon group velocity and a controllable filtration of unpolarized gamma radiation in a sample.
A new approach to the observation of electromagnetic-induced transparency in gamma optics is proposed. For this purpose, the propagation of a resonant gamma photon in a 57 Fe magnetic medium affected by an external radiofrequency (RF) field is considered. It is demonstrated that, in the case of crossing-anticrossing, a resonant RF field significantly transforms gamma-optical properties of the medium that become dependent on its parameters. This allows coherent control of the group velocity of gamma photons and controlled filtering of unpolarized gamma radiation in the sample to be realized.
We present a fully quantum mechanical treatment of resonant scattering of gamma radiation in a nuclear Λ-scheme. Simulations of the closed-form solution for the radiation intensity for N effective scatterers contributions are compared with Mössbauer spectra of FeCO3. It is shown that, although the nuclear level mixing scheme does not fulfill EIT conditions, the observable effects are similar. The change in polarization of the scattered radiation, due to level mixing, gives rise to the development of a strong complementary polarization state which is delayed with respect to the incident photon and to a reduction in absorption because this state does not interfere with the incident photon.
It is shown that the coherent interaction between gamma quantum and a large nuclear ensemble induces the spatial dependence of refraction index on radio-frequency field phase. It leads to the occurrence of an optically non-homogeneous structure. Both the conditions of electromagnetically induced transparency (EIT) and of maximum absorption of probe gamma field, caused by an exchange with radio-frequency reservoir, were obtained. The evolution of both the EIT regime and the group velocity of slow gamma photons were analyzed. The~influence of gamma pulse duration, polarization of radiation and linear dimensions of a medium was explored.