Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.073001
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Funding
- European Research Council (ERC) under the European Unions Horizon 2020 research and innovation program [947696]
- Deutsche Forschungsgemeinschaft (DFG) [423116110]
- Cluster of Excellence Precision Physics, Fundamental Interactions, and Structure of Matter - DFG within the German Excellence Strategy [PRISMA+ EXC 2118/1, 39083149]
- German-Israeli Foundation for scientific research and development [1490]
- Australian Research Council [DP190100974, DP200100150]
- JGU Gutenberg Fellowship
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Measurements of isotope shifts for Yb isotopes and Yb+ transitions, combined with existing data, show reduced significance of new-physics signal. The observed nonlinearity in the joint Yb/Yb+ King-plot analysis can be explained by the deformation of Yb nuclei.
We report measurements of isotope shifts for the five spinless Yb isotopes on the 6s(2) S-1(0) -> 5d6s D-1(2) transition using Doppler-free two-photon spectroscopy. We combine these data with existing measurements on two transitions in Yb+ [Counts et al. Phys. Rev. Lett. 125, 123002 (2020)], where deviation from King-plot linearity showed hints of a new bosonic force carrier at the 3 sigma level. The combined data strongly reduce the significance of the new-physics signal. We show that the observed nonlinearity in the joint Yb/Yb+ King-plot analysis can be accounted for by the deformation of the Yb nuclei.
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