Kinetic energy of He atoms in liquid He-4-He-3 mixtures

Senesi, R., Andreani, C., Fielding, Andrew L., Mayers, J., & Stirling, W. G. (2003) Kinetic energy of He atoms in liquid He-4-He-3 mixtures. Physical Review B (Condensed Matter and Materials Physics), 68(21), p. 214522.

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Abstract

Deep inelastic neutron scattering measurements on liquid 3He-4He mixtures in the normal phase have been performed on the VESUVIO spectrometer at the ISIS pulsed neutron source at exchanged wave vectors of about q≃120.0Å-1. The neutron Compton profiles J(y) of the mixtures were measured along the T=1.96K isotherm for 3He concentrations, x, ranging from 0.1 to 1.0 at saturated vapor pressures. Values of kinetic energies 〈T〉 of 3He and 4He atoms as a function of x, 〈T〉(x), were extracted from the second moment of J(y). The present determinations of 〈T〉(x) confirm previous experimental findings for both isotopes and, in the case of 3He, a substantial disagreement with theory is found. In particular 〈T〉(x) for the 3He atoms is found to be independent of concentration yielding a value 〈T〉3(x=0.1)≃12K, much lower than the value suggested by the most recent theoretical estimates of approximately 19 K.

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ID Code: 59152
Item Type: Journal Article
Refereed: Yes
DOI: 10.1103/PhysRevB.68.214522
ISSN: 1098-0121
Subjects: Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > CONDENSED MATTER PHYSICS (020400) > Condensed Matter Physics not elsewhere classified (020499)
Divisions: Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > Physics
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2003 The American Physical Society
Deposited On: 16 Apr 2013 23:57
Last Modified: 23 Apr 2013 02:33

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