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We point out that the proton-neutron energy contribution, for low multipoles(in particular for the quadrupole component), effectively renormalizes thestrength of the pairing interaction acting amongst identical nucleons fillingup a single-j or a set of degenerate many-j shells. We carry out thecalculation in lowest-order perturbation theory. We perform a study of thiscorrection in various mass regions. These results may have implications for theuse of pairing theory in medium-heavy nuclei and for the study of pairingenergy corrections to the liquid drop model when studying nuclear masses.Comment: 19 pages, TeX, 3 tables, 2 figures. Accepted in PR

Proton-neutron quadrupole interactions: An effective contribution to the pairing field