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

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arxiv 2309.02839 v1 pith:Q3WG5MVC submitted 2023-09-06 nucl-ex nucl-th

Kristian König , Stephan Fritzsche , Gaute Hagen , Jason D. Holt , Andrew Klose , Jeremy Lantis , Yuan Liu , Kei Minamisono
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Takayuki Miyagi Witold Nazarewicz Thomas Papenbrock Skyy V. Pineda Robert Powel Paul-Gerhard Reinhard
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classification nucl-exnucl-th
keywords chargeisotopeskinkneutronradiiabsentbehaviorbelow
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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.

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Cited by 1 Pith paper

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  1. Mass radius and D-term of atomic nuclei in relativistic mean field theory

    nucl-th 2026-05 unverdicted novelty 7.0 of 10

    D-term of nuclei exhibits kinks at magic neutron numbers, showing strong sensitivity of mechanical properties to shell structure.

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