High-precision isotope-shift and mass-ratio measurements in calcium reveal a ~900-sigma King-plot nonlinearity consistent with second-order mass shift plus nuclear polarization, and improve bounds on a new electron-neutron Yukawa boson.
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Nonlinear calcium King plot constrains new bosons and nuclear properties
High-precision isotope-shift and mass-ratio measurements in calcium reveal a ~900-sigma King-plot nonlinearity consistent with second-order mass shift plus nuclear polarization, and improve bounds on a new electron-neutron Yukawa boson.