Evidence for Nonlinear Isotope Shift in Yb${}^{+}$ Search for New Boson

Ian Counts, Joonseok Hur, Diana P. L. Aude Craik +7

We measure isotope shifts for five Yb${}^{+}$ isotopes with zero nuclear spin on two narrow optical quadrupole transitions ${}^2{S}_{1/2}\to {}^2{D}_{3/2}$, ${}^2S_{1/2} \rightarr…