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A search for sidereal variations in the frequency difference between co-located 129Xe and 3He Zeeman masers sets the most stringent limit to date on leading-order Lorentz and CPT violation involving the neutron, consistent with no effect at the level of 10(-31) GeV.

Limit on Lorentz andCPTViolation of the Neutron Using a Two-Species Noble-Gas Maser