Abstract
We performed a search for neutron spin coupling to a Lorentz- and -violating background field using a magnetometer with overlapping ensembles of K and atoms. The comagnetometer is mounted on a rotary platform for frequent reversal of its orientation. We measure sidereal oscillations in the signal to search for anomalous spin coupling of extra-solar origin. We determine the equatorial components of the background field interacting with the neutron spin to be and , improving on the previous limit by a factor of 30. This measurement represents the highest energy resolution of any spin anisotropy experiment.
- Received 28 June 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.151604
© 2010 The American Physical Society