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 solid angle in mome...
Gespeichert in:
| Veröffentlicht in: | Физика низких температур |
|---|---|
| Datum: | 2007 |
| Hauptverfasser: | , , , , |
| Format: | Artikel |
| Sprache: | English |
| Veröffentlicht: |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2007
|
| Schlagworte: | |
| Online Zugang: | https://nasplib.isofts.kiev.ua/handle/123456789/127809 |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| 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. |
Institution
Digital Library of Periodicals of National Academy of Sciences of Ukraine| id |
nasplib_isofts_kiev_ua-123456789-127809 |
|---|---|
| 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 |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II |
| 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_short |
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_sort |
creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of he ii |
| 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. |
| topic |
Квантовые жидкости и квантовые кpисталлы |
| topic_facet |
Квантовые жидкости и квантовые кpисталлы |
| publishDate |
2007 |
| language |
English |
| container_title |
Физика низких температур |
| publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
| format |
Article |
| 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.
|
| issn |
0132-6414 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/127809 |
| 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. |
| work_keys_str_mv |
AT adamenkoin creationofhighenergyphononsbyfourphononprocessesinanisotropicphononsystemsofheii AT kitsenkoyua creationofhighenergyphononsbyfourphononprocessesinanisotropicphononsystemsofheii AT nemchenkoke creationofhighenergyphononsbyfourphononprocessesinanisotropicphononsystemsofheii AT slipkova creationofhighenergyphononsbyfourphononprocessesinanisotropicphononsystemsofheii AT wyattafg creationofhighenergyphononsbyfourphononprocessesinanisotropicphononsystemsofheii |
| first_indexed |
2025-12-07T18:30:39Z |
| last_indexed |
2025-12-07T18:30:39Z |
| _version_ |
1850875302834601984 |