Abstract
Inelastic neutron scattering measurements of the roton in superfluid helium confined in two different porosity aerogels are presented. The temperature dependence of the roton energy exhibits an anomalous crossover behavior at T c = 1.9 K. Below T c the roton energy is found to be weakly temperature dependent while above T c it is very strongly temperature dependent. The roton lifetime for the confined liquid also display a weak crossover behavior. A simple qualitative model for this behavior in terms of a confined length scale is discussed.
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