Theoretical isotope shifts in neutral barium

The present work deals with a set of problems in isotope shifts of neutral barium spectral lines. Some well-known transitions $(6s^{21}{S}_0-6s6p{}^{1,3}{P}_1^o$ and $6s^{21}{S}_0-6p^{23}{P}_0)$ are 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 $\left\{\delta {\langle r^2\rangle }^{A,A^{\prime }}\right\}$ obtained from these lines are consistent with each other. The combination of the available nuclear mean-square radii with our electronic factors for the $6s5d{}^3{D}_{1,2}-6s6p{}^1{P}_1^o$ transitions produces isotope shift values in conflict with the laser spectroscopy measurements of U. Dammalapati et al. [Eur. Phys. J. D 53, 1 (2009)].