Theoretical isotope shifts in neutral barium
Nazé, Cédric · Li, Jiguang · Godefroid, Michel
Original · EN
The present work deals with a set of problems in isotope shifts of neutral barium spectral lines. Some well known transitions (6s² ¹S₀-6s6p ¹,³Pᵒ₁ and 6s² ¹S₀-6p² ³P₀) are first investigated. Values of the changes in the nuclear mean-square charge radius are deduced from the available experimental isotope shifts using our ab initio electronic factors. The three sets { δ r²ᵃ,ᵃ'} obtained from these lines are consistent with each other. The combination of the available nuclear mean-square radii with our electronic factors for the 6s5d ³D₁,₂ -6s6p ¹Pᵒ₁ transitions produces isotope shift values in conflict with the laser spectroscopy measurements of Dammalapati et al. (Eur. Phys. J. D 53, 1 (2009)).
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