Allum, D. R. and McClintock, Peter V. E. (1978) Nucleation of negatively charged vortex rings in superfluid Helium-4 near its solidification pressure. Journal of Low Temperature Physics, 31 (3-4). pp. 321-338. ISSN 0022-2291
Full text not available from this repository.Abstract
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.