Precision Isotope-Shift Measurement of the 1S 0 3P 2 Transition and a Multi-Transition King-Plot Consistency Test
Researchers used precision spectroscopy of Ytterbium atoms to measure isotope shifts with Hz-level accuracy across five isotopes. This high-precision data was used in a King plot analysis to test for new physics, successfully excluding certain mass ranges for a hypothetical new boson and constraining its parameters.