Abstract
When liquid 4He is condensed in porous aerogel glass (typical pore size ≈ 5000 Å), many of the superfluid properties are significantly altered. Measurements have been made of the dynamic structure factor S( Q, ω) of liquid 4He in restricted geometries. The collective phonon-roton excitations are shown to have an intrinsic broadening associated with the restricted geometry. The temperature dependence of the excitation spectrum is discussed.
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