Meson exchange current corrections to magnetic moments in quantum hadro-dynamics

We have calculated pion exchange current corrections to the magnetic moments of closed shell ±1 particle nuclei near A=16 and 40 within the framework of quantum hadro-dynamics (QHD). We find that the correction is significant and that, in general, the agreement of the QHD isovector moments with experiment is worsened. Comparisons to previous non-relativistic calculations are also made.