Kinetic energy of He atoms in liquid He-4-He-3 mixtures
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Embargo End Date
ICR Authors
Authors
Senesi, R
Andreani, C
Fielding, AL
Mayers, J
Stirling, WG
Andreani, C
Fielding, AL
Mayers, J
Stirling, WG
Document Type
Journal Article
Date
2003-12
Date Accepted
Abstract
Deep inelastic neutron scattering measurements on liquid He-3-He-4 mixtures in the normal phase have been performed on the VESUVIO spectrometer at the ISIS pulsed neutron source at exchanged wave vectors of about qsimilar or equal to120.0 Angstrom(-1). The neutron Compton profiles J(y) of the mixtures were measured along the T=1.96 K isotherm for He-3 concentrations, x, ranging from 0.1 to 1.0 at saturated vapor pressures. Values of kinetic energies <T> of He-3 and He-4 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 He-3, a substantial disagreement with theory is found. In particular <T>(x) for the He-3 atoms is found to be independent of concentration yielding a value <T>(3)(x=0.1)similar or equal to12 K, much lower than the value suggested by the most recent theoretical estimates of approximately 19 K.
Citation
PHYSICAL REVIEW B, 2003, 68
Rights
Source Title
Publisher
AMER PHYSICAL SOC
ISSN
1098-0121
eISSN
1550-235X