Revisiting the extraction of charge radii of ${}^{40}$Ca and ${}^{208}$Pb with muonic atom spectroscopy

Abstract

The extractions of nuclear charge radii from muonic atom spectroscopy for ${}^{40}$Ca and ${}^{208}$Pb are revisited to analyze the model dependencies induced by employing a Fermi-type charge distribution. For that, the charge densities, together with the corresponding muonic transition energies, calculated by the covariant density functional theory are used as a benchmark. The root-mean-square deviation of transition energies is calculated to quantitatively investigate the sensitivities of transition energies to the details of the two-parameter Fermi distribution. It is found that the second and fourth moments of the charge distribution can be extracted accurately from the muonic atom spectroscopy without much model dependencies, whereas the obtained two-parameter Fermi distributions cannot reproduce the details of the benchmarking charge densities and, in particular, its surface-diffuseness parameter cannot be determined accurately with the present experimental uncertainties on the muonic transition energies.

11 pages, 6 figures, and 2 tables

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Cited by in corpus (4)

• Global prediction of nuclear charge density distributions using deep neural network
• Impact of intrinsic electromagnetic structure on the nuclear charge radius in relativistic density functional theory
• The extraction of higher-order radial moments of nuclear charge density from muonic atom spectroscopy
• Smallness of the nuclear polarization effect in the hyperfine structure of heavy muonic atoms as a stimulus for next-generation experiments