Abstract
The form of the isovector meson-exchange magnetic moment operator for heavy nuclei is derived in a simple isobar-hole model for the meson-induced polarization of the nuclear medium. It is shown that the model-independent parts of the pion and ρ-meson exchange-current contributions are rather little changed by the medium polarization mechanisms whereas the model-dependent parts that involvegD 33 intermediate states are strongly quenched. Because of cancellations between the different exchange mechanisms the net meson-exchange contribution is appreciably changed by the medium polarization. An effective one-body operator that describes the meson-exchange contribution is constructed for closed-shell + one-particle nuclei.
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