Neutron radiography of helium II

M. E. Hayden, G. Archibald, P. D. Barnes, W. T. Buttler, D. J. Clark, M. D. Cooper, M. Espy, G. L. Greene, R. Golub, S. K. Lamoreaux, C. Lei, L. J. Marek, J. C. Peng, S. Penttila

Research output: Contribution to journalConference article

Abstract

We have used a neutron radiography technique to investigate the spatial distribution of 3He atoms in very dilute liquid 3He-4He mixtures at temperatures below the superfluid transition temperature. By imposing heat currents and monitoring the subsequent redistribution of 3He within the sample volume we obtain a direct measurement of the relevant mass diffusion coefficient. Data from these experiments provides a striking demonstration of the manner in which the distribution of impurity atoms within the liquid can be influenced by the presence of a free surface.

Original languageEnglish (US)
Pages (from-to)236-237
Number of pages2
JournalPhysica B: Condensed Matter
Volume329-333
DOIs
StatePublished - May 1 2003
EventProceedings of the 23rd international conference on low temper - Hiroshima, Japan
Duration: Aug 20 2002Aug 27 2002

Keywords

  • Diffusion
  • He-He mixtures
  • Helium vapour compression (HEVAC) effect
  • Neutron radiography
  • Superfluidity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Hayden, M. E., Archibald, G., Barnes, P. D., Buttler, W. T., Clark, D. J., Cooper, M. D., Espy, M., Greene, G. L., Golub, R., Lamoreaux, S. K., Lei, C., Marek, L. J., Peng, J. C., & Penttila, S. (2003). Neutron radiography of helium II. Physica B: Condensed Matter, 329-333, 236-237. https://doi.org/10.1016/S0921-4526(02)01974-9