Some features of the long-pulse propagation mode of a phonon sheet in superfluid 4He
| Autor: | C. D. H. Williams, Ruslan V. Vovk, Adrian F. G. Wyatt |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Long pulse Physics and Astronomy (miscellaneous) Condensed matter physics Phonon General Physics and Astronomy Pulse duration 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Superfluidity 0103 physical sciences Energy density 010306 general physics 0210 nano-technology Anisotropy Saturation (magnetic) Superfluid helium-4 |
| Zdroj: | Low Temperature Physics. 44:1062-1065 |
| ISSN: | 1090-6517 1063-777X |
| DOI: | 10.1063/1.5055848 |
| Popis: | The angular distribution of the energy density of an anisotropic “phonon sheet” was studied during its propagation in superfluid 4He at pulse duration up to 300 ns. The presence of a flat segment on the angular dependencies of phonon signal is explained by the formation of a “hot” area in the central region of the sheet and by the process of generation of high-energy phonons in this central region. The saturation of width of a flat section at pulse durations near 300 ns is explained by implementation of the long-pulsed beam propagation mode. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|