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- W1998340410 abstract "High energy phonons (ℏω/kB> 10K) injected into liquid4He at low ambient temperatures T∼60mK have mean free paths much longer than the sample dimensions. Phonons of lower energy spontaneously decay leaving this group of phonons isolated in the energy range. The spectral distribution of these high energy phonons is of interest both in its own right as it will lead to an understanding of the processes involved in its formation, and for interpreting the results of experiments in which these phonons are used, e.g. quantum evaporation. We have succeeded in detecting these phonons with a bolometer in the liquid4He and so can use time of flight spectroscopy to determine their spectrum. We find that the phonon energies are grouped around 10K with a half width at half height of < 0.5K. Measurements at higher pressures show that the high energy phonon spectrum peaks at the pressure dependent critical energy ωc(P) for spontaneous decay." @default.
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- W1998340410 date "1994-02-01" @default.
- W1998340410 modified "2023-10-14" @default.
- W1998340410 title "The spectrum of high energy phonons injected into liquid4He" @default.
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- W1998340410 doi "https://doi.org/10.1016/0921-4526(94)90604-1" @default.
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