Torsional Oscillator Experiments with High Stability and Reproducibility |
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| Authors: | Muneyuki Fukuda Kazunari Ooyama Toshiaki Obata Vladimir Kovacik Minoru Kubota |
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| Affiliation: | (1) Division of Physics under Extreme Conditions, Institute for Solid State Physics, Univ. Tokyo, Roppongi 7-22-1, Minato-ku Tokyo, Japan |
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| Abstract: | We report experiments of the torsional oscillator to observe the superfluid transition in
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He films in porous glass (the pore diameter is 1 m). Stability and reproducibility of the oscillator, which quite often is problematic in previous experiments, is essential for a quantitative analysis of observations in different conditions. It follows that the friction of the superfluid films and the energy dissipation of the solid films are derived from comparisons of measurements for different film thickness. |
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