Iterated and irreducible pion-photon exchange in nuclei

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Abstract

We calculate the contribution to the nuclear energy density functional which arises from iterated pion-photon exchange between nucleons. In heavy nuclei, this novel charge-symmetry breaking interaction leads to an additional binding of each proton by about 0.2 MeV. Compared to that the analogous effect from irreducible pion-photon exchange is negligibly small. As a possible mechanism to resolve the Nolen-Schiffer anomaly we propose the iteration of one-photon exchange with an attractive short-range NN-interaction. The corresponding energy per proton reads Ē[ρp] = (2α/15π2)(π2-3+6 ln 2)App k p2 with ρp=kp 3/3π2 the proton density and App ≈ 2 fm an effective (in-medium) scattering length. Hints for such a value of A pp come from phenomenological Skyrme forces and from the neutron matter equation of state.

Original languageEnglish
Article number034337
Pages (from-to)034337-1-034337-6
JournalPhysical Review C - Nuclear Physics
Volume69
Issue number3
DOIs
StatePublished - Mar 2004

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