Evidence of Two-Source King Plot Nonlinearity in Spectroscopic Search for New Boson.

  title={Evidence of Two-Source King Plot Nonlinearity in Spectroscopic Search for New Boson.},
  author={Joonseok Hur and Diana P. L. Aude Craik and Ian Counts and Eugene A. Knyazev and Luke Caldwell and Calvin Leung and Swadha Pandey and Julian C. Berengut and A. J. Geddes and Witold Nazarewicz and Paul-Gerhard Reinhard and Akio Kawasaki and Honggi Jeon and Wonho Jhe and Vladan Vuleti'c},
  journal={Physical review letters},
  volume={128 16},
Optical precision spectroscopy of isotope shifts can be used to test for new forces beyond the standard model, and to determine basic properties of atomic nuclei. We measure isotope shifts on the highly forbidden ^{2}S_{1/2}→^{2}F_{7/2} octupole transition of trapped ^{168,170,172,174,176}Yb ions. When combined with previous measurements in Yb^{+} and very recent measurements in Yb, the data reveal a King plot nonlinearity of up to 240σ. The trends exhibited by experimental data are explained… 

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