Abstract
We use QCD sum rules to investigate isospin-breaking effects in nuclear matter. The isospin-breaking condensate 〈 NM| u ̄ u− d ̄ d| NM〉 is shown to play an important role. In a reasonable model the neutron becomes (0.9 ± 0.6) MeV more bound than the proton, providing a possible solution for the Nolen-Schiffer anomaly. The various contributions to the value are analysed. The possible consequences for nucleon-nucleon isospin-breaking forces are discussed.
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