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Spatial evolution of pulses of low-energy phonons in liquid 4He

✍ Scribed by I.N. Adamenko; K.E. Nemchenko; V.A. Slipko; R.V. Vovk; C.D.H. Williams; A.F.G. Wyatt

Publisher: Elsevier Science
Year: 2005
Tongue: English
Weight: 136 KB
Volume: 120
Category: Article
ISSN: 0167-7322
DOI: 10.1016/j.molliq.2004.07.061

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✦ Synopsis

The system of equations that describes the temporal and spatial evolution of low-energy phonons (l-phonons) is obtained for the cases of plane and axial symmetry. From the solutions of these equations, we discuss the time-resolved measurements of the angular distribution of lphonons. These show a rather unusual mesa shape with a flat top in the direction normal to the heater. We consider that the flat top is due to the creation of high-energy phonons (h-phonons).

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