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Small-angle scattering of neutrons on normal and superfluid liquid helium
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Tsipenyuk, Yu. M., Kirichek, O. and Petrenko, Oleg (2013) Small-angle scattering of neutrons on normal and superfluid liquid helium. Low Temperature Physics, Volume 39 (Number 9). Article number 777. doi:10.1063/1.4821758 ISSN 1063-777X.
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Official URL: http://dx.doi.org/10.1063/1.4821758
Abstract
Experiments on small-angle scattering of neutrons on liquid helium at temperatures of 1.0–5 K at the ISIS pulsed neutron source (England) are reported. Detailed measurements of the angular distribution of the scattered neutrons reveal a significant change in the temperature dependence of the second moment of the pairwise correlation function (the first derivative of the angular distribution for small scattering angles). At high temperatures the angular distribution of the scattered neutrons follows the classical description for small-angle scattering, but at temperatures below the λ-point, quantum mechanical behavior is observed (scattering of neutrons on quantum fluctuations). It is confirmed experimentally that over the entire temperature range the neutron scattering cross section at zero angle is determined by classical thermodynamic fluctuations in the density.
Item Type: | Journal Article | ||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Journal or Publication Title: | Low Temperature Physics | ||||
Publisher: | American Institute of Physics | ||||
ISSN: | 1063-777X | ||||
Official Date: | 2013 | ||||
Dates: |
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Volume: | Volume 39 | ||||
Number: | Number 9 | ||||
Page Range: | Article number 777 | ||||
DOI: | 10.1063/1.4821758 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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