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  1. Moreno, O (Ed.)
    An overview of neutron skin predictions obtained using an empirical nonlocal dispersive optical model (DOM) is presented. The DOM links both scattering and bound-state experimental data through a subtracted dispersion relation which allows for fully consistent, data-informed predictions for nuclei where such data exist. Large skins were predicted for both48Ca ( R skin 48 = 0.25 ± 0.023 fm in 2017) and208Pb ( R skin 208 = 0.25 ± 0.05 fm in 2020). Whereas the DOM prediction in208Pb is within 1 σ of the subsequent PREX-2 measurement, the DOM prediction in48Ca is over 2 σ larger than the thin neutron skin resulting from CREX. From the moment it was revealed, the thin skin in48Ca has puzzled the nuclear-physics community as no adequate theories simultaneously predict both a large skin in208Pb and a small skin in48Ca. The DOM is unique in its ability to treat both structure and reaction data on the same footing, providing a unique perspective on this R skin puzzle. It appears vital that more neutron data be measured in both the scattering and bound-state domain for48Ca to clarify the situation. 
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