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FSU-SCRI-96-08 The Okamoto-Nolen-Schiffer anomaly without ρ-ω mixing

We examine the effect of isospin-violating meson-nucleon coupling constants and meson mixing on the binding-energy differences of mirror nuclei using a relativistic mean-field approximation to the Walecka model. We find no important binding-energy corrections from the vector-meson sector; our model possesses no contribution from ρ-ω mixing at Q 2 = 0, and isospin violation in the vector-meson–nucleon vertices generates a small class III charge-symmetry-breaking potential. In contrast, we obtain large binding-energy differences—of the order of several hundred keV—from the pseudoscalar sector. Two effects are primarily responsible for this new finding: a) the inclusion of isospin breaking in the pion-nucleon coupling constant, and b) the in-medium enhancement of the small components of the bound-state wave functions.