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. 2023 Aug 30;620(7976):965–970. doi: 10.1038/s41586-023-06352-6

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© The Author(s), under exclusive licence to Springer Nature Limited 2023, corrected publication 2023

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Fig. 1 — a, Nuclear chart up to Z = 18 showing the stable and short-lived (β-decaying) nuclei. The experimentally established neutron drip line is shown by the thick blue line. Known doubly magic nuclei are also indicated. b, Schematic illustration of the neutron configuration for a nucleus with a closed N = 20 shell. c, The neutron configuration involving particle–hole excitations across a quenched N = 20 shell gap.