Reconnections of Quantized Vortex Rings in Superfluid He 4 at Very Low Temperatures

P. M. Walmsley, P. A. Tompsett, D. E. Zmeev, A. I. Golov

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    © 2014 Published by American Physical Society.Collisions in a beam of unidirectional quantized vortex rings of nearly identical radii R in superfluid He4 in the limit of zero temperature (0.05 K) were studied using time-of-flight spectroscopy. Reconnections between two primary rings result in secondary vortex loops of both smaller and larger radii. Discrete steps in the distribution of flight times, due to the limits on the earliest possible arrival times of secondary loops created after either one or two consecutive reconnections, are observed. The density of primary rings was found to be capped at the value 500cm-2R-1 independent of the injected density. This is due to collisions between rings causing the piling up of many other vortex rings. Both observations are in quantitative agreement with our theory.
    Original languageEnglish
    Pages (from-to)125302
    JournalPhysical Review Letters
    Issue number12
    Publication statusPublished - 17 Sept 2014


    • superfluid
    • quantum turbulence
    • vortex ring
    • reconnection


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