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dc.contributor.author |
Adamenko, I.N. |
|
dc.contributor.author |
Kitsenko, Yu.A. |
|
dc.contributor.author |
Nemchenko, K.E. |
|
dc.contributor.author |
Slipko, V.A. |
|
dc.contributor.author |
Wyatt, A.F.G. |
|
dc.date.accessioned |
2017-12-28T12:54:17Z |
|
dc.date.available |
2017-12-28T12:54:17Z |
|
dc.date.issued |
2007 |
|
dc.identifier.citation |
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. |
uk_UA |
dc.identifier.issn |
0132-6414 |
|
dc.identifier.other |
PACS: 67.70.+n, 68.08.–p, 62.60.+v |
|
dc.identifier.uri |
http://dspace.nbuv.gov.ua/handle/123456789/127809 |
|
dc.description.abstract |
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. |
uk_UA |
dc.description.sponsorship |
We express our gratitude to EPSRC of the UK (grant
EP/C 523199/1) for support of this work. |
uk_UA |
dc.language.iso |
en |
uk_UA |
dc.publisher |
Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
uk_UA |
dc.relation.ispartof |
Физика низких температур |
|
dc.subject |
Квантовые жидкости и квантовые кpисталлы |
uk_UA |
dc.title |
Creation of high-energy phonons by four-phonon processes in anisotropic phonon systems of He II |
uk_UA |
dc.type |
Article |
uk_UA |
dc.status |
published earlier |
uk_UA |
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