Isotope shifts for S0 1 - P0,1o 3 Yb lines from multiconfiguration Dirac-Hartree-Fock calculations

Relativistic multiconfiguration Dirac-Hartree-Fock calculations with configuration interaction are carried out for the S01 and P0,1o3 states in neutral ytterbium by use of the available grasp2018 package. From the resultant atomic state functions and the ris4 program, we evaluate the mass- and field-shift parameters for the S01-P0o3 (clock) and S01-P1o3 (intercombination) lines. We present improved estimates of the nuclear charge parameters λA,A′ and differences in mean-square charge radii δ(r2)A,A′ and examine the second-order hyperfine interaction for the P0,1o3 states. Isotope shifts for the clock transition have been estimated by three largely independent means from which we predict the unknown clock-line frequencies in bosonic Yb isotopes. Knowledge of these line frequencies has implications for King-plot nonlinearity tests and the search for beyond-standard-model signatures.