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A roton-driven mechanism for nucleation of negatively charged vortex rings in isotopically pure 4He.

Research output: Contribution to journalJournal article

Published

<mark>Journal publication date</mark>31/03/1980
<mark>Journal</mark>Physics Letters A
Issue3-4
Volume76
Number of pages3
Pages303-305
<mark>Original language</mark>English

Abstract

We have measured the temperature dependence of the vortex nucleation rate due to negative ions in isotopically pure superfluid 4He. We conclude that nucleation proceeds via two independent mechanisms: a temperature-independent "intrinsic" mechanism; and a roton-driven mechanism, dominant above 0.6 K.