Journal ArticleDOI
High-frequency ultrasonic attenuation in superfluid helium under pressure.
J. Jäckle,K. W. Kehr +1 more
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In this paper, the authors attributed the formation of a shoulder in the high-frequency ultrasonic attenuation in superfluid helium under pressure to a restriction on the three-phonon process with thermal phonons.Abstract:
We attribute the formation of a shoulder in the high-frequency ultrasonic attenuation in superfluid helium under pressure to a restriction on the three-phonon process with thermal phonons. The restriction is proposed to follow from the pressure dependence of the phonon dispersion at zero temperature. The steep rise above the shoulder due to phonon-roton and roton-roton interactions also indicates large dispersion effects under pressure.read more
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Journal ArticleDOI
Structure and excitations of liquid helium
A D B Woods,R A Cowley +1 more
TL;DR: There has been considerable progress in the study of the structure and elementary excitations of liquid helium as discussed by the authors, which has largely arisen from the development and refinement of neutron, X-ray and light scattering techniques and also from more detailed ultrasonic measurements.
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A tissue phantom for visualization and measurement of ultrasound-induced cavitation damage
TL;DR: Results indicate that the phantom can accurately mimic the response of soft tissue to cavitation and provide a useful tool for studying damage induced by acoustic cavitation.
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Superfluid optomechanics: coupling of a superfluid to a superconducting condensate
L A De Lorenzo,Keith Schwab +1 more
TL;DR: In this paper, the authors investigate the low loss acoustic motion of superfluid^4He parametrically coupled to a very low loss, superconducting Nb, TE_(011) microwave resonator, forming a gram-scale, sideband resolved, optomechanical system.
Journal ArticleDOI
Interactions between phonon sheets in superfluid helium
TL;DR: In this paper, the authors measured the effect of colliding two phonon sheets together at different angles and found that at small angles they interact strongly and a hot line is formed along the line of intersection of the two sheets.
Journal ArticleDOI
Ultra-High Q Acoustic Resonance in Superfluid ^4He
L A De Lorenzo,Keith Schwab +1 more
TL;DR: In this paper, the authors measured the acoustic quality of a gram-scale, kilohertz-frequency superfluid resonator, detected through the parametric coupling to a superconducting niobium microwave cavity.