Precision Determination of Isotope Shifts in Ytterbium and Implications for New Physics
N. L. Figueroa, J. C. Berengut, V. A. Dzuba, V. V. Flambaum, D. Budker, D. Antypas
Abstract
We report measurements of isotope shifts for the five spinless Yb isotopes on the 6s^{2} ^{1}S_{0}→5d6s ^{1}D_{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)PRLTAO0031-900710.1103/PhysRevLett.125.123002], where deviation from King-plot linearity showed hints of a new bosonic force carrier at the 3σ 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.
Topics & Concepts
YtterbiumIsotopePhysicsDeformation (meteorology)Atomic physicsKinetic isotope effectNonlinear systemJoint (building)LinearityPlateau (mathematics)Standard deviationNuclear physicsStable isotope ratioIsotopes of heliumPhysics beyond the Standard ModelAdvanced Frequency and Time StandardsCold Atom Physics and Bose-Einstein CondensatesNuclear physics research studies