Neutron skins: A perspective from dispersive optical models

Atkinson, M. C.; Dickhoff, W. H.

doi:10.3389/fphy.2024.1487314

Title: Neutron skins: A perspective from dispersive optical models

Journal Article · 27 October 2024 · Frontiers in Physics

DOI: https://doi.org/10.3389/fphy.2024.1487314 · OSTI ID:2507413

Atkinson, M. C. ^[1]; Dickhoff, W. H. ^[2]

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Washington Univ., St. Louis, MO (United States)

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 both ⁴⁸Ca ( R$$^{48}_{skin}$$ = 0.25 ± 0.023 fm in 2017) and ²⁰⁸Pb (R$$^{208}_{skin}$$) = 0.25 ± 0.05 fm in 2020). Whereas the DOM prediction in ²⁰⁸Pb is within 1σ of the subsequent PREX-2 measurement, the DOM prediction in ⁴⁸Ca is over 2σ larger than the thin neutron skin resulting from CREX. From the moment it was revealed, the thin skin in ⁴⁸Ca has puzzled the nuclear-physics community as no adequate theories simultaneously predict both a large skin in ²⁰⁸Pb and a small skin in ⁴⁸Ca. 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 for ⁴⁸Ca to clarify the situation.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 2507413

Report Number(s):: LLNL--JRNL-868759; 1105057

Journal Information:: Frontiers in Physics, Journal Name: Frontiers in Physics Vol. 12; ISSN 2296-424X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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