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Spin excitations and pairing gaps in the superconducting state of YBa2Cu3O7- delta.

We show that it is possible to give a quantitative account of the temperature dependence of the measurements of the Knight shift and the spin-lattice-relaxation times for planar copper and oxygen sites in the superconducting state of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} by assuming that the planar excitations form a strongly coupled antiferromagnetic Fermi liquid. We consider anisotropic singlet and triplet pairing states with an orbital momentum {ital l}{le}2 and report on gap parameters and antiferromagnetic enhancement factors that are consistent with experiment. We present as well our calculations for the chain sites, for which an additional relaxation mechanism appears required.