This article has an erratum: [erratum]
Volume 58, Number 5, June 2002
|Page(s)||718 - 724|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 May 2002|
Measurement of the mass diffusion coefficient in superfluid over the 0.45–0.95 K temperature range
University of California,
Los Alamos National Laboratory, Physics Division
Los Alamos, New Mexico 87545, USA
2 Department of Physics, Simon Fraser University 8888 University Drive, Burnaby, B.C., Canada V5A 1S6
3 Hahn-Meitner Institut - Glienicker Str. 100, D-14109 Berlin, Germany
Accepted: 8 February 2002
We have directly 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 neutrons 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 for D with 20% accuracy. At temperatures below 0.7 K and for concentrations of order 10-4, we find cm2/s, in agreement with a theoretical approximation.
PACS: 67.40.Pm – Transport processes / 67.40.Bz – Phenomenology and two-fluid models / 67.40.Yv – Impurities and other defects
© EDP Sciences, 2002
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