New limit on Lorentz- and CPT-violating neutron spin interactions

J. M. Brown, S. J. Smullin, T. W. Kornack, M. V. Romalis

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234 Scopus citations


We performed a search for neutron spin coupling to a Lorentz- and CPT-violating background field using a magnetometer with overlapping ensembles of K and He3 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 bxn=(0.1±1.6)×10-33GeV and bxn=(2.5±1.6) ×10-33GeV, improving on the previous limit by a factor of 30. This measurement represents the highest energy resolution of any spin anisotropy experiment.

Original languageEnglish (US)
Article number151604
JournalPhysical review letters
Issue number15
StatePublished - Oct 5 2010

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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