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The stability of a one-component model system interacting through an isotropic potential with an attractive part and a softened core is investigated through integral equations and molecular dynamics simulation. The 'penetrability' of the soft core makes it possible for the system to pass from an expanded liquid structure at intermediate densities to a more compact one at high densities.doi:10.1088/0953-8984/14/9/308 fatcat:ga6a74td7fdcvjlmetqvgk6fcu