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Full-Text Articles in Physical Sciences and Mathematics
Fluid-Structure-Factor Measurements In 4he For 5.5<=T<=7.0 K, Robert Hallock, D. A. Ewen, H. N. Robkoff
Fluid-Structure-Factor Measurements In 4he For 5.5<=T<=7.0 K, Robert Hallock, D. A. Ewen, H. N. Robkoff
Robert Hallock
We report precise measurements of the structure factor S(k) as a function of the momentum transfer k for 4He at T=5.5 and 6.5 K in the density range 10<~ρ<~155 kg/m3. No theoretical predictions that can be tested against the data are available. The recent theoretical work by Bruch et al. at T=7.0 K, ρ=69.6 kg/m3 is in only limited agreement with our experimental data at T=7.0 K, ρ=69.0 kg/m3.
Third Sound And The Decay Of Persistent Currents In Unsaturated 3he-4he Films, Robert Hallock
Third Sound And The Decay Of Persistent Currents In Unsaturated 3he-4he Films, Robert Hallock
Robert Hallock
We report the observation of metastable currents in unsaturated 3He-4He-mixture films. The decay rate of these currents is found to be an increasing function of 3He concentration in the film. A simple model for the role of the 3He, adequate to explain our observations of the concentration dependence of the third-sound velocity, does not agree with the measured decay rates.