New test of local Lorentz invariance using a 21Ne-Rb-K comagnetometer.

  title={New test of local Lorentz invariance using a 21Ne-Rb-K comagnetometer.},
  author={Marc Smiciklas and J. Michael Brown and Lawrence W. Cheuk and Sylvia J. Smullin and Michael V. Romalis},
  journal={Physical review letters},
  volume={107 17},
We develop a new comagnetometer using (21)Ne atoms with nuclear spin I=3/2 and Rb atoms polarized by spin exchange with K atoms to search for tensor interactions that violate local Lorentz invariance. We frequently reverse the orientation of the experiment and search for signals at the first and second harmonics of the sidereal frequency. We constrain 4 of the 5 spatial Lorentz-violating coefficients c(jk)(n) that parametrize anisotropy of the maximum attainable velocity of a neutron at a level… 

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