Kinetic energy and condensate fraction in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow><mml:mrow/><mml:mrow><mml:mn>4</mml:mn></mml:mrow><mml:mrow/><mml:mrow/><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>3</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>He mixtures

Deep inelastic neutron scattering measurements have been carried out to measure the kinetic energy and condensate fraction in liquid $^{3}\mathrm{\ensuremath{-}}^{4}$He mixtures. Samples with $^{3}\mathrm{He}$ concentration on the order of 10% were studied at 1.4 K and 2.3--2.5 K. The condensate fraction was found to be 0.18\ifmmode\pm\else\textpm\fi{}0.03, much larger than theoretical predictions. The measured kinetic energies of the $^{3}\mathrm{He}$ and $^{4}\mathrm{He}$ in the mixture remain the same as their values in the pure phase, in disagreement with current theoretical predictions.

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