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Roton assisted vortex nucleation in isotopically pure superfluid 4He.

Research output: Contribution to journalJournal article

Published

Journal publication date1981
JournalPhysica B: Condensed Matter
Volume107
Number of pages2
Pages571-572
Original languageEnglish

Abstract

Measurements are presented of the rate nu at which negative ions nucleate quantised vortex rings in isotopically pure superfluid 4He for temperatures 0.3 < T < 0.8 K and electric fields 6 x 10^4 < E < 1.5 X 10^6 V/m. It is shown that there is a temperature dependent component of nu, which is accurately proportional to the thermal roton density provided that due allowance is made for the drag arising from ion-excitation scattering.

Bibliographic note

Proceedings of the 16th International Conference on Low Temperature Physics, Los Angeles, 19-25 August 1981.