Observation of an unexpected negative isotope shift in 229Th+ and its theoretical explanation

@article{Okhapkin2015ObservationOA,
  title={Observation of an unexpected negative isotope shift in 229Th+ and its theoretical explanation},
  author={M. V. Okhapkin and David M. Meier and Ekkehard Peik and Marianna S. Safronova and Mikhail G. Kozlov and Sergey G. Porsev},
  journal={Physical Review A},
  year={2015},
  volume={92}
}
We have measured the hyperfine structure and isotope shifts of the 402.0 nm and 399.6 nm resonance lines in 229Th+. These transitions could provide pathways towards the 229Th isomeric nuclear state excitation. An unexpected negative isotope shift relative to 232Th+ is observed for the 399.6 nm line, indicating a strong Coulomb coupling of the excited state to the nucleus. We have developed a new all-order approach to the isotope shift calculations that is generally applicable to heavy atoms and… 

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