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Nuclear sizes and the isotope shift
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Darwin-Foldy nuclear-size corrections in electronic atoms and nuclear radii are discussed from the nuclear-physics perspective. The interpretation of precise isotope-shift measurements is formalism dependent, and care must be exercised in interpreting these results and those obtained from relativistic electron scattering from nuclei. We strongly advocate that the entire nuclear-charge operator be used in calculating nuclear-size corrections in atoms rather than relegating portions of it to the nonradiative recoil corrections. A preliminary examination of the intrinsic deuteron radius obtained from isotope-shift measurements suggests the presence of small meson-exchange currents (exotic binding contributions of relativistic order) in the nuclear charge operator, which contribute approximately 1/2%.
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FRIAR, J. L., MARTORELL DOMENECH, Juan and SPRUNG, Donald W. L. Nuclear sizes and the isotope shift. Physical Review A. 1997. Vol. 56, num. 6, pags. 4579-4586. ISSN 1050-2947. [consulted: 24 of June of 2026]. Available at: https://hdl.handle.net/2445/9560