Vector and Tensor Coulomb Energies

Vector and tensor Coulomb energies have been extracted from the known experimental Coulomb energy differences between isobaric doublets and triplets in light nuclei. The vector Coulomb energy essentially depends linearly on $A$ within a given shell and shows discontinuities at major shell closures and superimposed weak oscillations. The tensor Coulomb energy exhibits a pronounced oscillatory structure. The characteristic $A$ dependence of both Coulomb energies is discussed and the oscillations in particular are related to Coulomb pairing effects.