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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


Journal publication date31/03/1980
JournalPhysics Letters A
Journal number3-4
Number of pages3
Original languageEnglish


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.