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Interference effects of radiation emitted from nuclear excitons

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Abstract

Interference effects in nuclear forward scattering of synchrotron radiation (NFSSR) from two spatially separated stainless-steel foils A and B mounted downstream behind each other have been investigated. Target A can be sinusoidally vibrated by high-frequency (MHz) ultrasound (US), target B is moved at a constant Doppler velocity which is large compared to the natural width of the nuclear transition. Due to this large Doppler shift radiative coupling between both targets is disrupted and the nuclear excitons in A and B develop independently in space and time after the SR pulse. As a consequence, the emission from the whole system (A&B) is dominated by the interference of the emissions from A and B. The application of US to target A is a powerful method to change the relative phasing of the emissions and thus to investigate interference effects originating from the two nuclear excitons in detail. Four distinct cases were studied: (a) If target A is kept stationary and only B is moved at large constant velocityv, the interference pattern exhibits a Quantum Beat (QB) whose period is determined byv. (b) If, in addition, target A is sinusoidally vibrated in a piston-like motion by US and the initial US phase Φ0 is locked to the SR pulse, the QB is frequency modulated by the US. The variation of the QB frequency increases with the US modulation indexm. (c) In the case that Φ0 is not synchronized to the SR pulse (phase averaging over Φ0) drastic changes of the amplitude and phase reversals of the QB pattern occur in the time regions around odd multiples of half of the US period. (d) If Φ0 is not synchronized to the SR pulse and the US motion is no longer pistonlike, the NFSSR intensity has to be averaged over both Φ0 andm (amplitude) of the US motion. Surprisingly the QB interference pattern does not vanish completely but a short QB signal remains at times of the full US period even at high values ofm. All NFSSR patterns investigated are interpreted and quantitatively described by the dynamical theory.

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Authors and Affiliations

  1. Physik-Department E15, Technische Universität München, D-85748, Garching, Germany

    W. Potzel, U. van Bürck, P. Schindelmann & H. Hagn

  2. Russian Research Center “Kurchatov Institute”, 123182, Moscow, Russia

    G. V. Smirnov & S. L. Popov

  3. Institut für Experimentalphysik, Universität Hamburg, D-22761, Hamburg, Germany

    E. Gerdau, Yu. V. Shvyd’ko, J. Jäschke & H. D. Rüter

  4. European Synchrotron Radiation Facility (ESRF), POB 220, F-38043, Grenoble, France

    A. I. Chumakov & R. Rüffer

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  1. W. Potzel
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  2. U. van Bürck
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  3. P. Schindelmann
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  4. H. Hagn
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  7. E. Gerdau
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Correspondence to W. Potzel.

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On the occasion of the 80th birthday of Hendrik de Waard

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Potzel, W., van Bürck, U., Schindelmann, P. et al. Interference effects of radiation emitted from nuclear excitons. Hyperfine Interact 151, 263–281 (2003). https://doi.org/10.1023/B:HYPE.0000020418.37541.9a

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