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- W2027657890 abstract "The basic goal of this paper is to present the theory which stands at the basis of the calculations of the /sup 4/He excitation spectrum reported by Wong and Huang. The exact N-particle hard-sphere pseudopotential is constructed through the method of non-local-field operators developed earlier. Keeping only the two-body interaction terms, this pseudopotential replaces the exact two-particle boundary conditions which is demonstrated here and thus has been proposed as a model potential for actual helium-helium interaction in the liquid state. A pair state of the Bogoliubov type is used to calculate the ground-state energy of such a system. An expansion-parameter scheme is presented which drastically simplifies the mathematics involved and justifies previous approximations employed by one of the authors. The expansion describes the dilute case by assuming a large portion of the particles in the zero-momentum state and the dense case by assuming only a negligible portion of the particles in the Bose-Einstein state." @default.
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- W2027657890 date "1978-02-01" @default.
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- W2027657890 title "Critical analysis of the hard-sphere model for superfluidHe4. I." @default.
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- W2027657890 doi "https://doi.org/10.1103/physrevb.17.1102" @default.
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