| Issue |
J. Phys. Colloques
Volume 39, Number C6, Août 1978
The XVth International Conference on low temperature physicsQuantum Fluids and Solids Superconductivity |
|
|---|---|---|
| Page(s) | C6-211 - C6-212 | |
| DOI | https://doi.org/10.1051/jphyscol:1978693 | |
The XVth International Conference on low temperature physics
Quantum Fluids and Solids
Superconductivity
J. Phys. Colloques 39 (1978) C6-211-C6-212
DOI: 10.1051/jphyscol:1978693
1 Atomic Energy of Canada Limited, Chalk River, Ontario, Canada, KOJ 1JO.
2 Institut Laue-Langevin, 156X Centre de Tri, 38042 Grenoble Cedex, France.
Quantum Fluids and Solids
Superconductivity
J. Phys. Colloques 39 (1978) C6-211-C6-212
DOI: 10.1051/jphyscol:1978693
TEMPERATURE DEPENDENCE OF PHONONS IN LIQUID 4He
E.C. Svensson1, R. Scherm2 and A.D.B. Woods11 Atomic Energy of Canada Limited, Chalk River, Ontario, Canada, KOJ 1JO.
2 Institut Laue-Langevin, 156X Centre de Tri, 38042 Grenoble Cedex, France.
Résumé
On a mesuré la diffusion de neutrons par 4He liquide aux vecteurs d'onde de 0.80 ; 1,13 ; 1,30 et 1,40 Å-1 et aux temperatures de 1,00 ; 1,38 ; 1,77 ; 1,97 ; 2,07 ; 2,12 ; 2,15 ; 2,26 et 4,21 K. On peut voir un pic "uniphonon" dans toutes les distributions lorsque T < Tλ = 2,17 K mais ce pic est absent lorsque T > Tλ.
Abstract
The neutron scattering by liquid 4He for wave vectors of 0.80, 1.13, 1.30 and 1.40 Å-1 has been measured at 1.00, 1.38, 1.77, 1.97, 2.07, 2.12, 2.15, 2.26 and 4.21 K. A "one-phonon" peak is evident in all distributions for T < Tλ = 2.17 K but is absent for T > Tλ.