Abstract
We report measurements of the isotope shifts of two transitions ( and ) in neodymium ions () with hundredfold improved accuracy, using laser spectroscopy of a cryogenically cooled neutral plasma. The isotope shifts were measured across a set of five spin-zero isotopes that spans a nuclear shape transition. We discuss the prospects for further improvements to the accuracy of isotope shifts using optical clock transitions, which could enable extremely precise tests of King plot linearity for new physics searches.
- Received 18 February 2020
- Accepted 6 April 2020
DOI:https://doi.org/10.1103/PhysRevA.101.052505
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