NDLI: Interference effects of radiation emitted from nuclear excitons

Content Provider	Springer Nature Link
Author	Potzel, W. Bürck, U. Schindelmann, P. Hagn, H. Smirv, G. V. Popov, S. L. Gerdau, E. Shvyd’ko, Yu. V. Jäschke, J. Rüter, H. D. Chumakov, A. I. Rüffer, R.
Copyright Year	2004
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.
Starting Page	263
Ending Page	281
Page Count	19
File Format	PDF
ISSN	03043843
Journal	Hyperfine Interactions
Volume Number	151
Issue Number	1-4
e-ISSN	15729540
Language	English
Publisher	Springer Netherlands
Publisher Date	2004-01-01
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	coherent nuclear forward scattering nuclear exciton interference of synchrotron radiation quantum beats radiative coupling frequency modulation ultra sound Nuclear Physics, Heavy Ions, Hadrons Atoms, Molecules, Clusters and Plasmas Condensed Matter Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics Atomic and Molecular Physics, and Optics Physical and Theoretical Chemistry Condensed Matter Physics

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