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Rings among the rotons : measurements of the vortex nucleation rate for negative ions whose drift velocities are limited by roton emission.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

<mark>Journal publication date</mark>08/1978
<mark>Journal</mark>Journal de Physique
Number of pages2
Pages (from-to)174-175
Publication StatusPublished
<mark>Original language</mark>English


We have measured vortex ring nucleation rates nu for negative ions moving in He II under the influence of electric fields 0.8 < E < 12 kV/cm, for temperatures 0.4 < T < 0.6 K and a pressure of 25 bar. For E > 5 kV/cm, the experimental data are well described by a theory due to Bowley. An anomalous dependence of nu on T found at lower lower E is attributed to the influence of isotopic impurities.

Bibliographic note

Proceedings of the 15th International Conference on Low Temperature Physics, Grenoble, 1978.