Abstract
High-resolution laser-atomic-beam spectroscopy has been used to determine isotope shifts in five transitions between low-lying states of Sr I. With these results and existing data a parametric analysis of level isotope shifts has been performed. The transition isotope shifts have been separated into field shift and mass shift contributions with a King-plot procedure using model-independent nuclear charge equivalent radiiR k from muonic x-ray measurements. Values for the mean-square nuclear charge radiiδ〈r 2 〉 have been calculated from the field shifts in the optical transitions 5s 2 1 S 0-5s5p 3 P 1 and 5s5p 3 P 0-5s6s 3 S 1 and compared with correspondingδ〈r 2 〉 values evaluated from muonic x-ray data.
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