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We redefine the surface tension coefficient for a nuclear Fermi-liquid dropwith a finite diffuse layer. Following Gibbs-Tolman concept, we introduce theequimolar radius R_e of sharp surface droplet at which the surface tension isapplied and the radius of tension surface R_s which provides the minimum of thesurface tension coefficient \sigma. This procedure allows us to derive both thesurface tension and the corresponding curvature correction (Tolman length)correctly for the curved and diffuse interface. We point out that the curvaturecorrection depends significantly on the finite diffuse interface. This fact ismissed in traditional nuclear considerations of curvature correction to thesurface tension. We show that Tolman's length \xi is negative for nuclearFermi-liquid drop. The value of the Tolman length is only slightly sensitive tothe Skyrme force parametrization and equals \xi=-0.36 fm.

Curved and diffuse interface effects on the nuclear surface tension