Exchange interaction between intermediate D13(1520)-hole and S11(1535)-hole states in the near-threshold coherent η photoproduction from nuclei
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Coherent η-meson photoproduction from nuclei is considered within an extended analogue of the Δ-hole model taking into account the configuration mixing of baryon-hole excitations of different sorts of baryons. Calculated integrated and differential cross-sections for reactions 12C(γ,η)12Cg.s. and 16O(γ,η)16Og.s. demonstrate the important role of the exchange interaction between intermediate D13(1520)-hole and S11(1535)-hole excitations.
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