Medium (IMAGE)
Caption
Energy scheme of the radioactive source of 14.4 keV photons and the vibrating absorber used in the experiment. The 57Co nuclei (left side) in the state |d? decay to 57Fe nuclei in the excited state |c? (with a half-life of T1/2?272 day), followed by cascade decay: |c??|b? (with decay time T?12??ns) and |b??|a? (with decay time TS?141??ns) with emission of 122 and 14.4 keV photons (shown by blue and green lines), respectively. Depolarized recoilless 14.4 keV photons ( λ?0.86??Å) resonantly interact with transition |1??|2? of 57Fe nuclei when propagating through the single-line 57Fe absorber (right side). They are resonantly absorbed in motionless absorber (black lines). Harmonic vibration of the absorber as a whole (pistonlike vibration) with circular frequency Ω, amplitude R, and initial phase ϑ along the photon propagation direction (marked in red) leads to periodic temporary variation in |1??|2? transition frequency ω21(t) (dashed red curves) due to the Doppler effect. It modifies the interaction of the photon with absorber and can result in AIT (see Fig. 2 and text). The axis z labels the laboratory reference frame, red axis z' labels the reference frame of the vibrating absorber, and Δz=z?z'.
Credit
Kazan Federal University
Usage Restrictions
None
License
Licensed content