Ab Initio Calculation of Nuclear Structure Effects in Light Muonic Atoms

Chen, Ji

doi:10.1007/978-3-030-32357-8_140

Cited by 2 publications

(1 citation statement)

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“…The sad fact that atomic nuclei are not point charges is a major obstruction to this program, because atomic energy shifts due to nuclear structure can be larger than the fundamental corrections to be measured. Furthermore, the intricacies of the strong interactions make ab initio predictions of nuclear properties necessarily inaccurate, often making nuclear uncertainties the dominant theoretical error when predicting atomic energy levels [27] - [62].…”

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confidence: 99%

Precision Nuclear-Spin Effects in Atoms: EFT Methods for Reducing Theory Errors

Zalavari,

Burgess,

Hayman

et al. 2020

Preprint

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We use effective field theory to compute the influence of nuclear structure on precision calculations of atomic energy levels. As usual, the EFT's effective couplings correspond to the various nuclear properties (such as the charge radius, nuclear polarizabilities, Friar and Zemach moments etc.) that dominate its low-energy electromagnetic influence on its surroundings. By extending to spinning nuclei the arguments developed for spinless ones in arXiv:1708.09768, we use the EFT to show -to any fixed order in Zα (where Z is the atomic number and α the fine-structure constant) and the ratio of nuclear to atomic size -that nuclear properties actually contribute to electronic energies through fewer parameters than the number of these effective nuclear couplings naively suggests. Our result is derived using a position-space method for matching effective parameters to nuclear properties in the EFT, that more efficiently exploits the simplicity of the small-nucleus limit in atomic systems. By showing that precision calculations of atomic spectra depend on fewer nuclear uncertainties than naively expected, this observation allows the construction of many nucleus-independent combinations of atomic energy differences whose measurement can be used to test fundamental physics (such as the predictions of QED) because their theoretical uncertainties are not limited by the accuracy of nuclear calculations. We provide several simple examples of such nucleus-free predictions for Hydrogen-like atoms.

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