Surprising charge-radius kink in the Sc isotopes at N=20

Abstract

Charge radii of neutron deficient 40Sc and 41Sc nuclei were determined using collinear laser spectroscopy. With the new data, the chain of Sc charge radii extends below the neutron magic number N=20 and shows a pronounced kink, generally taken as a signature of a shell closure, but one notably absent in the neighboring Ca, K and Ar isotopic chains. Theoretical models that explain the trend at N=20 for the Ca isotopes cannot reproduce this puzzling behavior.

References in corpus (8)

• Nuclear magic numbers: new features far from stability
• A nucleus-dependent valence-space approach to nuclear structure
• Converged ab initio calculations of heavy nuclei
• Charge radii in covariant density functional theory: a global view
• Systematics of E2 strength in the sd-shell with the valence-space in-medium similarity renormalization group
• Charge radii of ${}^{55,56}$Ni reveal a surprisingly similar behavior at $N=28$ in Ca and Ni isotopes
• Kinetic-beam-energy determination via collinear laser spectroscopy
• Ground State Magnetic Dipole Moment of ${}^{40}$Sc

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• Implication of shell quenching in scandium isotopes around N=20
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• Implication of odd-even staggering in the charge radii of calcium isotopes