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Charge radii of neutron deficient 40Sc and 41Sc nuclei were determined usingcollinear laser spectroscopy. With the new data, the chain of Sc charge radiiextends 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 inthe neighboring Ca, K and Ar isotopic chains. Theoretical models that explainthe trend at N=20 for the Ca isotopes cannot reproduce this puzzling behavior.

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