Home > Research > Publications & Outputs > Neutron reflection from the surfaces of liquid ...

Associated organisational unit

Electronic data

  • LT25Neutrons.pdf

    Rights statement: Open access

    Final published version, 561 KB, PDF document

    Available under license: CC BY-NC-ND

Links

Text available via DOI:

View graph of relations

Neutron reflection from the surfaces of liquid 4He and a dilute 3He-4He Solution.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Published
Close
Article number032022
<mark>Journal publication date</mark>2009
<mark>Journal</mark>Journal of Physics: Conference Series
Issue number3
Volume150
Number of pages4
Pages (from-to)-
Publication StatusPublished
<mark>Original language</mark>English
Event25th International Conference on Low Temperature Physics (LT25) - Amsterdam
Duration: 6/08/200813/08/2008

Conference

Conference25th International Conference on Low Temperature Physics (LT25)
CityAmsterdam
Period6/08/0813/08/08

Abstract

We report and discuss the first neutron reflection measurements from the free surfaces of normal and superfluid 4He and of a 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 the 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.