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We investigated numerically the high-temperature/high-pressure phase diagramof Xenon as modelled through the exp-6 interaction potential, which is thoughtto provide a reliable description of the thermal behaviour of rare gases underextreme conditions. We performed a series of extensive NVT Monte Carlosimulations which, in conjunction with exact computation of the solid freeenergy by the Frenkel-Ladd method, allowed us to precisely locate the freezingand the melting thresholds at each temperature. We find that, under isothermalcompression, the exp-6 fluid freezes directly into a FCC solid; however, above4500 K, an intermediate BCC phase becomes stable in a narrow range ofpressures. The chemical potential of the HCP phase does never significantlydiffer from that of the FCC solid of equal T and P, though the former is foundto slightly overcome the latter. We discuss our results in the light ofprevious numerical studies of the same model system and of the experimentaldata available for Xenon.Comment: 34 pages, 6 figures, accepted on Phys. Rev.

High-pressure phase diagram of the exp-6 model: The case of Xe