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The regular periodic intensity bursts recently observed in the expansion of solid 4He into vacuum have anomalies that have been attributed to a transition to some new solid phase induced by excess vacancies. Here it is shown that a small concentration of 3He, from 1% down to 0.1%, added to the...
Quantized vortices in liquid 4 He are treated quantum mechanically with realistic many-body model wave functions in variational calculations for energy and core structure at T = 0 K. A rectilinear vortex and both small and large vortex rings are studied. Calculated results indicate that rotons...
The kinetics of the temperature and concentration variations in the superfluid 3He–4He mixtures with initial concentration of 9.8% 3He, and heated from below, was studied experimentally under the pressure of 0.38 bar over a temperature range of 150–400 mK. It is found that in contrast to...
Mechanical oscillators are widely used for measurements of the elastic properties of solids at low temperatures. In most of such experiments mechanical displacements are detected via capacitive changes. In order to improve the sensitivity we have developed a novel detection technique relying on...
Two-dimensional Lagrangian trajectories of the inertial particle in helium II are analyzed in the vicinity of the triple-vortex structure, i.e. the superfluid vortex and the normal dipole-like vortex structure induced by the mutual friction. It is shown that the vortices in the normal fluid can...
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