Abstract
This paper studies the effects of roton-roton interactions on the thermodynamic properties of He II. The entropy S and normal-fluid density rho/sub n/ are calculated to order exp(-2..delta../k/sub B/T) (..delta.. is the roton energy gap at zero temperature), taking into account the repeated scattering of a roton pair. We find that there are two contributions of order exp(-2..delta../k/sub B/T) to S and rho/sub n/, one from interacting rotons and another from bound roton pairs. We also find that the interacting roton contribution to S and rho/sub n/ differ from that predicted by the theory of Bendt, Cowan, and Yarnell and discuss the physical origin of this difference.
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