Impact of Two-Body Currents on Magnetic Dipole Moments of Nuclei
T. Miyagi, X. G. Cao, R. Seutin, Sonia Bacca, R. F. García Ruíz, K. Hebeler, J. D. Holt, A. Schwenk
Abstract
We investigate the effects of two-body currents on magnetic dipole moments of medium-mass and heavy nuclei using the valence-space in-medium similarity renormalization group with chiral effective field theory interactions and currents. Focusing on near doubly magic nuclei from oxygen to bismuth, we have found that the leading two-body currents globally improve the agreement with experimental magnetic moments. Moreover, our results show the importance of multishell effects for ^{41}Ca, which suggest that the Z=N=20 gap in ^{40}Ca is not as robust as in ^{48}Ca. The increasing contribution of two-body currents in heavier systems is explained by the operator structure of the center-of-mass dependent Sachs term.