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Nuclear structure & decays, Magnetic moment, Ab initio calculations
MPINP:
Starke Wechselwirkung und exotische Kerne – Abteilung Blaum
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 41Ca, which suggest that the Z = N = 20 gap in 40Ca is not as robust as in 48Ca. The increasing contribution of two-body currents in heavier systems is explained by the operator structure of the center-of-mass dependent Sachs term.
