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Narrow-Angle Beams of Strongly Interacting Phonons

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Abstract

We demonstrate that narrow-angle phonon pulses of low energy phonons in liquid 4He are strongly interacting and rapidly come into equilibrium within a narrow cone in momentum space. The effect of collimation on such a system is to strongly reduce the axial phonon flux. This gives a method of separating high and low energy phonons.

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Authors and Affiliations

  1. School of Physics, University of Exeter, Exeter, EX4 4QL, UK

    C. D. H. Williams, A. A. Zakharenko & A. F. G. Wyatt

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  1. C. D. H. Williams
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  2. A. A. Zakharenko
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  3. A. F. G. Wyatt
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Williams, C.D.H., Zakharenko, A.A. & Wyatt, A.F.G. Narrow-Angle Beams of Strongly Interacting Phonons. Journal of Low Temperature Physics 126, 591–596 (2002). https://doi.org/10.1023/A:1013727403790

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