Datensatz

Zusammenfassung

The electric quadrupole moment of $^{49}$Sc was measured by collinear laser
spectroscopy at CERN-ISOLDE to be $Q_{\rm s}=-0.159(8)$ $e$b, and a nearly
tenfold improvement in precision was reached for the electromagnetic moments of
$^{47,49}$Sc. The single-particle behavior and nucleon-nucleon correlations are
investigated 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 data
are interpreted with shell-model calculations using an effective interaction,
and ab-initio valence-space in-medium similarity renormalization group
calculations based on chiral interactions. These results highlight the
sensitivity of nuclear electromagnetic moments to different types of
nucleon-nucleon correlations, and establish an important benchmark for further
developments of theoretical calculations.