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The present work deals with a set of problems in isotope shifts of neutralbarium spectral lines. Some well known transitions($6s^2~^1S_0-6s6p~^{1,3}P^o_1$ and $6s^2~^1S_0-6p^2~^3P_0$) are firstinvestigated. Values of the changes in the nuclear mean-square charge radiusare deduced from the available experimental isotope shifts using our ab initioelectronic factors. The three sets $\{ \delta\langle r^2\rangle^{A,A'}\} $obtained from these lines are consistent with each other. The combination ofthe available nuclear mean-square radii with our electronic factors for the$6s5d~^3D_{1,2} -6s6p~^{1}P^o_1$ transitions produces isotope shift values inconflict with the laser spectroscopy measurements of Dammalapati et al. (Eur.Phys. J. D 53, 1 (2009)).

Theoretical isotope shifts in neutral barium