Precision determination of isotope shifts in ytterbium and implications for new physics

Abstract

We report measurements of isotope shifts for the five spinless Yb isotopes on the $6s^2{}^1{\text{S}}_0\to 5d6s{}^1{\text{D}}_2$ transition using Doppler-free two-photon spectroscopy. We combine these data with existing measurements on two transitions in Yb${}^{+}$ [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 reduces 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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