Measurement of the 3He mass diffusion coefficient in superfluid 4He over the 0.45-0.95 K temperature range

Details Measurement of the 3He mass diffusion coefficient in superfluid 4He over the 0.45-0.95 K temperature range Measurement of the 3He mass diffusion coefficient in superfluid 4He over the 0.45-0.95 K temperature range

2001-10-04

arxiv.org/abs/cond-mat/0110097v1

Physics

Condensed Matter

8 pages, 5 figures. Submitted to Europhysics Letters and prepared in that journal's format

Scientific paper

10.1209/epl/i2002-00408-4

We have measured the mass diffusion coefficient D of 3He in superfluid 4He at temperatures lower than were previously possible. The experimental technique utilizes scintillation light produced when neutron react with 3He nuclei, and allows measurement of the 3He density integrated along the trajectory of a well-defined neutron beam. By measuring the change in 3He density near a heater as a function of applied heat current, we are able to infer values of D with 20% accuracy. At temperatures below 0.7 K and for concentrations of order 10^{-4} we find D=(2.0+2.4-1.2)T^-(6.5 -/+ 1.2) cm^2/s, in agreement with a theoretical approximation.

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