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arXiv · 2510.27427

Model-independent determination of nuclear charge radii from Li-like ions

V. A. Yerokhin·B. Ohayon
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Abstract

We demonstrate that recent advances in QED theory of Li-like ions [V. A. Yerokhin et al., Phys. Rev. A 112, 042801 (2025)] enable determinations of absolute nuclear charge radii for heavy elements. By incorporating constraints derived from electron-scattering data, we obtain radii that are independent of the assumed model of the nuclear charge distribution. Our approach is validated for $^{208}$Pb, a well-studied spherical nucleus, and is then applied to $^{209}$Bi, where low-lying nuclear excitations complicate the interpretation of muonic-atom data.

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V. A. Yerokhin, B. Ohayon. 2025-10-31. Model-independent determination of nuclear charge radii from Li-like ions. https://doi.org/10.1103/71d6-w383

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