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Viscosity and mean free path of very diluted solutions of 3He in 4He

Niemetz, M. ; Kerscher, H. ; Schoepe, Wilfried


We have measured the laminar friction of various diluted 3 He- 4 He mixtures, of natural 4 He and of isotopically pure 4 He on an oscillating sphere below 1 K. For 3 He concentrations x 3 ranging from 10 −2 to 10 −4 we find a reduction of the drag above 0.5 K when compared to the pure liquid and a large enhancement below, which is almost independent of x 3 . At low concentrations 5·10 −5 >x 3 ...


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