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

Charlton, T. R. and Dalgliesh, R. M. and Ganshyn, Andriy and Kirichek, O. and Langridge, S. and McClintock, P. V. E. (2009) Neutron reflection from the surfaces of liquid 4He and a dilute 3He-4He Solution. Journal of Physics: Conference Series, 150 (3). -. ISSN 1742-6596

[img]
Preview
PDF (LT25Neutrons.pdf)
LT25Neutrons.pdf - Published Version
Available under License Creative Commons Attribution Non-commercial No Derivatives.

Download (574kB)

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.

Item Type: Journal Article
Journal or Publication Title: Journal of Physics: Conference Series
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 31237
Deposited By: Professor P. V. E. McClintock
Deposited On: 07 Jan 2010 09:36
Refereed?: Yes
Published?: Published
Last Modified: 18 Sep 2019 00:32
URI: https://eprints.lancs.ac.uk/id/eprint/31237

Actions (login required)

View Item View Item