Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II
The problem of the creation of high-energy phonons (h-phonons) by a pulse of low-energy phonons
 (l-phonons) moving from a heater to a detector in superfluid helium, is solved. The rate of h-phonon creation
 is obtained and it is shown that created h-phonons occupy a much smaller sol...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2007 |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II / I.N. Adamenko, Yu.A. Kitsenko, K.E. Nemchenko, V.A. Slipko, A.F.G. Wyatt // Физика низких температур. — 2007. — Т. 33, № 5. — С. 523-537. — Бібліогр.: 22 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862721434365722624 |
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| author | Adamenko, I.N. Kitsenko, Yu.A. Nemchenko, K.E. Slipko, V.A. Wyatt, A.F.G. |
| author_facet | Adamenko, I.N. Kitsenko, Yu.A. Nemchenko, K.E. Slipko, V.A. Wyatt, A.F.G. |
| citation_txt | Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II / I.N. Adamenko, Yu.A. Kitsenko, K.E. Nemchenko, V.A. Slipko, A.F.G. Wyatt // Физика низких температур. — 2007. — Т. 33, № 5. — С. 523-537. — Бібліогр.: 22 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | The problem of the creation of high-energy phonons (h-phonons) by a pulse of low-energy phonons
(l-phonons) moving from a heater to a detector in superfluid helium, is solved. The rate of h-phonon creation
is obtained and it is shown that created h-phonons occupy a much smaller solid angle in momentum space,
than the l-phonons. An analytical expression for the creation rate of h-phonon, along the symmetry axis of a
pulse, are derived. It allows us to get useful approximate analytical expressions for the creation rate of
h-phonons. The time dependences of the parameters which describe the l-phonon pulse are obtained. This
shows that half of the initial energy of l-phonon pulse can be transferred into h-phonons. The results of the
calculations are compared with experimental data and we show that this theory explains a number of experimental
results. The value of the momentum, which separates the l- and h-phonon subsystems, is found.
|
| first_indexed | 2025-12-07T18:30:39Z |
| format | Article |
| fulltext | |
| id | nasplib_isofts_kiev_ua-123456789-127809 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T18:30:39Z |
| publishDate | 2007 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| record_format | dspace |
| spelling | Adamenko, I.N. Kitsenko, Yu.A. Nemchenko, K.E. Slipko, V.A. Wyatt, A.F.G. 2017-12-28T12:54:17Z 2017-12-28T12:54:17Z 2007 Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II / I.N. Adamenko, Yu.A. Kitsenko, K.E. Nemchenko, V.A. Slipko, A.F.G. Wyatt // Физика низких температур. — 2007. — Т. 33, № 5. — С. 523-537. — Бібліогр.: 22 назв. — англ. 0132-6414 PACS: 67.70.+n, 68.08.–p, 62.60.+v https://nasplib.isofts.kiev.ua/handle/123456789/127809 The problem of the creation of high-energy phonons (h-phonons) by a pulse of low-energy phonons
 (l-phonons) moving from a heater to a detector in superfluid helium, is solved. The rate of h-phonon creation
 is obtained and it is shown that created h-phonons occupy a much smaller solid angle in momentum space,
 than the l-phonons. An analytical expression for the creation rate of h-phonon, along the symmetry axis of a
 pulse, are derived. It allows us to get useful approximate analytical expressions for the creation rate of
 h-phonons. The time dependences of the parameters which describe the l-phonon pulse are obtained. This
 shows that half of the initial energy of l-phonon pulse can be transferred into h-phonons. The results of the
 calculations are compared with experimental data and we show that this theory explains a number of experimental
 results. The value of the momentum, which separates the l- and h-phonon subsystems, is found. We express our gratitude to EPSRC of the UK (grant
 EP/C 523199/1) for support of this work. en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур Квантовые жидкости и квантовые кpисталлы Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II Article published earlier |
| spellingShingle | Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II Adamenko, I.N. Kitsenko, Yu.A. Nemchenko, K.E. Slipko, V.A. Wyatt, A.F.G. Квантовые жидкости и квантовые кpисталлы |
| title | Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II |
| title_full | Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II |
| title_fullStr | Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II |
| title_full_unstemmed | Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II |
| title_short | Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II |
| title_sort | creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of he ii |
| topic | Квантовые жидкости и квантовые кpисталлы |
| topic_facet | Квантовые жидкости и квантовые кpисталлы |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/127809 |
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