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Nucleation of negatively charged vortex rings in superfluid Helium-4 near its solidification pressure.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>05/1978
<mark>Journal</mark>Journal of Low Temperature Physics
Issue number3-4
Number of pages18
Pages (from-to)321-338
Publication StatusPublished
<mark>Original language</mark>English


The rate nu at which negative ions nucleate vortex rings in He II has been measured at 25 bar for electric fields E up to 12kV/cm and temperatures T down to 0.4 K. A strong temperature dependence of nu observed for T < 0.6 K and E < 5 kV/cm is attributed to the influence of isotopic impurities. Although the temperature-independent behavior found for T < 0.6 K and 5 < E < 12 kV/cm is consistent with a theoretical prediction by Bowley, the relatively very much larger values of nu measured near 1K indicate a serious deficiency in the model on which the theory is based.