Propagating phonons in liquid 4He

A.F.G. Wyatt, N.A. Lockerbie, R.A. Sherlock

Research output: Contribution to journalArticle

31 Citations (Scopus)


at T approximately=0.1 K is studied as a function of pressure input power and propagation distance. Using a superconducting tunnel junction detector it is found that a single injected pulse can form two propagating pulses at low pressures but only one at high pressures. It is shown that three-phonon scattering can explain this behaviour. At low pressures, one group of phonons propagates ballistically while another group consists of strongly interacting phonons which travel at the ultrasonic velocity.
Original languageEnglish
Pages (from-to)3507-3522
Number of pages15
JournalJournal of Physics: Condensed Matter
Issue number22
Publication statusPublished - 5 Jun 1989


  • quantum gases
  • liquids
  • solids
  • condensed matter
  • structural
  • mechanical
  • thermal

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