REPRESENTATION OF THE SHORT-RANGE INTERACTIONS IN~LIQUID~HELIUM VIA MODIFIED HARD SPHERE POTENTIALS

I. O. Vakarchuk, A. A. Rovenchak

Ivan Franko National University of Lviv, Department for Theoretical Physics
12 Drahomanov Str., Lviv, UA-79005, Ukraine

In this paper we propose five different modifications of the hard sphere potential for the modeling of a short-range repulsion and the calculation of thermodynamic and transport properties of liquid \He4. We calculate the potential energy, the total energy, and the sound velocity at $T=0$ K. It is shown that three of the proposed potentials give a satisfactory description of these properties.

PACS number(s): 34.20.Cf, 67.40.Kh, 67.40.Mj

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