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

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Area of Science:

  • Atomic Physics
  • Quantum Information
  • Nuclear Physics

Background:

  • Precise measurements of isotope shifts in atomic ions are crucial for testing fundamental physics.
  • Deviations from linearity in King plots can signal new interactions or nuclear structure effects.

Purpose of the Study:

  • To measure isotope shifts for Yb+ ions with high accuracy.
  • To investigate the King plot linearity for Yb+ isotopes.
  • To explore potential new physics or nuclear effects causing observed nonlinearities.

Main Methods:

  • High-accuracy (∼300 Hz) measurement of isotope shifts for five Yb+ isotopes.
  • Utilized two narrow optical quadrupole transitions: ^{2}S_{1/2}→^{2}D_{3/2} and ^{2}S_{1/2}→^{2}D_{5/2}.
  • Analysis of the King plot for linearity deviations.

Main Results:

  • A 3×10^{-7} deviation from linearity was observed in the King plot at the 3σ uncertainty level.
  • The quadratic field shift was identified as a potential nuclear contributor to the nonlinearity.
  • The nonlinearity pattern provides a method to distinguish new bosonic forces from nuclear effects.

Conclusions:

  • The observed King plot nonlinearity in Yb+ isotopes may indicate physics beyond the Standard Model or complex nuclear effects.
  • Future high-precision measurements can leverage this nonlinearity to differentiate between new fundamental forces and nuclear structure contributions.
  • This study offers a pathway to probe for new bosonic force carriers using atomic spectroscopy.