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Toward a universal description of pairing properties in nuclei far fromstability, we extend the energy density functional by enriching the isovectordensity dependence in the particle-particle channel (pair density functional,pair-DF). We emphasize the necessity of both the linear and quadratic isovectordensity terms. The parameters are optimized by the Hartree-Fock-Bogoliubovcalculation for 156 nuclei of the mass number A=118-196 and the asymmetryparameter (N-Z)/A<0.25. We clarify that the pair-DF should include theisovector density dependence in order to take into account the effect of theisoscalar and isovector effective masses in the particle-hole channelconsistently. The different Skyrme forces can give the small difference in thepairing gaps toward the neutron drip line, if the optimal pair-DF consistentwith the particle-hole channel is employed.

Optimal pair density functional for description of nuclei with large neutron excess