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Neutron scattering from quantum liquids [electronic resource].

Published
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 1976.
Physical Description
Pages: 19 : digital, PDF file
Additional Creators
United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Recent neutron scattering measurements on the quantum liquids /sup 4/He and /sup 3/He are described. In the Bose superfluid there is a well-defined excitation for wave vectors less than 3.6 A/sup -1/. In the Fermi liquid measurements are much more difficult because of the large absorption cross section, but measurements at the Institute Laue--Langevin have shown that there are no well-defined excitations at 0.63 K for wave vectors between 1.0 and 2.6 A/sup -1/. The difference between these results is due to the existence of particle--hole excitations in the Fermi liquid into which collective excitations can decay. Because of the simplicity of the excitations in /sup 4/He, it has become a testing ground for the effects of the interactions between the excitations. Measurements are described which show that while roton--roton interactions are attractive at small wave vectors, they are repulsive at larger wave vectors. The scattering at large momentum transfer in /sup 4/He has been measured, but its interpretation is still open to question.
Report Numbers
E 1.99:bnl-21404
E 1.99: conf-760601-10
conf-760601-10
bnl-21404
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Note
Published through SciTech Connect.
01/01/1976.
"bnl-21404"
" conf-760601-10"
Conference on neutron scattering, Gatlinburg, TN, USA, 6 Jun 1976.
Cowley, R.A.
Brookhaven National Lab., Upton, N.Y. (USA)
Funding Information
E(30-1)-16
View MARC record | catkey: 14065544