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- W1973363676 abstract "We have studied the transition from second sound to ballistic phonon flow in He II up to pressures of 24 bar. At saturated vapor pressure the phonon-phonon scattering rate $ensuremath{tau}_{mathrm{pp}}^{}{}_{}{}^{ensuremath{-}1}ensuremath{cong}1.7ifmmodetimeselsetexttimesfi{}{10}^{6}{T}^{3}$ ${mathrm{sec}}^{ensuremath{-}1}$ for $T<0.6$ K. At 24 bar, $ensuremath{tau}_{mathrm{pp}}^{}{}_{}{}^{ensuremath{-}1}<8ifmmodetimeselsetexttimesfi{}{10}^{4}$ ${mathrm{sec}}^{ensuremath{-}1}$ for $T<0.7$ K. The phonon-roton scattering rate $ensuremath{tau}_{mathrm{pr}}^{}{}_{}{}^{ensuremath{-}1}$ is ensuremath{sim} ${10}^{6}$ ${mathrm{sec}}^{ensuremath{-}1}$ at 0.75 K and almost pressure independent. At 24 bar between 0.4 and 0.7 K, in addition to ballistic phonons, we observe a second pulse traveling at 16 m/sec, which we believe is the propagation of interacting rotons." @default.
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- W1973363676 date "1973-05-28" @default.
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- W1973363676 title "Phonon and Roton Propagation in He II under Pressure" @default.
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- W1973363676 doi "https://doi.org/10.1103/physrevlett.30.1129" @default.
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