Abstract
A molecular dynamics simulation has been performed to investigate the Hugoniot equation-of-state (EOS) and the corresponding radial distribution function (RDF) of liquid helium at high temperatures and densities. The calculated Hugoniot EOS is well in agreement with the experiments given by Nellis et al., and the corresponding RDFs show distinct peak or peaks due to the most probable nearest-neighbor packing, though the matter being studied is liquid. A single nearest-neighbor peak appears in the lower pressure regime, but two peaks, including a newly second-nearest-neighbor peak besides the former one, emerges when the shock state goes up around T=1.2×10 4 K and the density ρ=0.409 g/cm 3, demonstrating a higher-order transition of a disorder–order one for the second-nearest-neighbor structure.
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