Viscoelastic behavior of helium at 39 K and 114 bar

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Abstract
The dynamic structure factor S(k,ω) of dense helium at 39.3 K (≃8Tc) and 114 bar is measured by inelastic neutron scattering for wave numbers 3≤k≤24 nm−1. In contrast to dense noble-gas fluids at T<2Tc, the present S(k,ω) can be described completely by the viscoelastic model, in which S(k,ω) is determined for each k by its zeroth, second, and fourth frequency moment and by one decay rate (that of the microscopic momentum flux).