Kinetic energy of He atoms in liquid 4He-3He mixtures
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 wavevectors of about q 120.0 -1. The neutron Compton profiles J(y) of the mixtures were measured along the T=1.96 K isotherm for 3He concentrations, x, ranging from 0.1 to 1.0 at saturated vapour 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) 12 K , much lower than the value suggested by the most recent theoretical estimates of approximately 19 K .
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