Energy spectrum of impurity excitations in superfluid helium
Journal Article
·
· Sov. J. Low Temp. Phys. (Engl. Transl.); (United States)
OSTI ID:7340270
The experimental data on the density of the normal component in helium-isotope solutions have been used to examine the form of the Fermi branch in the elementary-excitation spectrum. It has been found that the state density for the impurity excitations of large momentum is higher than had previously been assumed, and also that these quasiparticles produce an appreciable contribution to the thermodynamic parameters. The dispersion law obtained allows one to describe with good accuracy the available experimental data on the normal density for /sup 3/He-/sup 4/He solutions over wide ranges of temperatures and concentrations. It has been found that the energy spectrum of the /sup 3/He quasiparticles has a new feature: an end point, at which an impurity excitation decays into a roton and a /sup 3/He quasiparticle of small momentum. (AIP)
- Research Organization:
- Physicotechnical Institute of Low Temperatures, Academy of Sciences of the Ukrainian SSR
- OSTI ID:
- 7340270
- Journal Information:
- Sov. J. Low Temp. Phys. (Engl. Transl.); (United States), Journal Name: Sov. J. Low Temp. Phys. (Engl. Transl.); (United States) Vol. 2:4; ISSN SJLPD
- Country of Publication:
- United States
- Language:
- English
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