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Persistent URL http://purl.org/net/epubs/work/50451
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Record Id 50451
Title Neutron reflection from the surface of liquid 4He and a dilute 3He-4He solution
Abstract We report and discuss the first neutron reflection measurements from the free surface of normal and superfluid 4He and of liquid 3He-4He mixture. In case of liquid 4He the surface roughness is different above and below the lambda transition, being smoother in the superfluid state. For the superfluid, we also observe the formation of a surface layer ~200 Å thick which has a subtly different neutron scattering cross-section. The results can be interpreted as an enhancement of Bose-Einstein condensate fraction close to the helium surface. We find that the addition of 3He isotopic impurities leads to the formation of Andreev levels at low temperatures.
Organisation ISIS , ISIS-CRISP , STFC
Keywords Physics , neutron reflection , liquid helium , SSTD 2008-2009
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Language English (EN)
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Journal Article J Phys Conf Ser 150 (2009): 032022. doi:10.1088/1742-6596/150/3/032022 2009