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The electric quadrupole moment of $^{49}$Sc was measured by collinear laserspectroscopy at CERN-ISOLDE to be $Q_{\rm s}=-0.159(8)$ $e$b, and a nearlytenfold improvement in precision was reached for the electromagnetic moments of$^{47,49}$Sc. The single-particle behavior and nucleon-nucleon correlations areinvestigated with the electromagnetic moments of $Z=21$ isotopes and $N=28$isotones as valence neutrons and protons fill the distinctive $0f_{7/2}$ orbit,respectively, located between magic numbers, 20 and 28. The experimental dataare interpreted with shell-model calculations using an effective interaction,and ab-initio valence-space in-medium similarity renormalization groupcalculations based on chiral interactions. These results highlight thesensitivity of nuclear electromagnetic moments to different types ofnucleon-nucleon correlations, and establish an important benchmark for furtherdevelopments of theoretical calculations.

Electromagnetic moments of scandium isotopes and $N=28$ isotones in the distinctive $0f_{7/2}$ orbit