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%e investigate the three-dimensional Hubbard model and show that paramagnon exchange near a spin-density-wave instability gives rise to a strong singlet d-wave pairing interaction. For a cubic band the singlet (d"~~and d3,a, 2) channels are enhanced while the singlet (d,~,d",d",) and triplet p-wave channels are suppressed. A unique feature of this pairing mechanism is its sensitivity to band structure and band filling.Pairing interactions for continuum fermion systems with short-range repulsive interactions have been modeled in terms of paramagnon exchange. ' 3 Here the bare singleparticle energies are described in terms of an effective mass, and the Fermi surface is spherical. As the strength

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