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      New limit on Lorentz and CPT violating neutron spin interactions using a free precession 3He-129Xe co-magnetometer

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          Abstract

          We report on the search for a CPT and Lorentz invariance violating coupling of the 3He and 129Xe nuclear spins (each largely determined by a valence neutron) to background tensor fields which permeate the universe. Our experimental approach is to measure the free precession of nuclear spin polarized 3He and 129Xe atoms in a homogeneous magnetic guiding field of about 400 nT using LTC SQUIDs as low-noise magnetic flux detectors. As the laboratory reference frame rotates with respect to distant stars, we look for a sidereal modulation of the Larmor frequencies of the co-located spin samples. As a result we obtain an upper limit on the equatorial component of the background field interacting with the spin of the bound neutron bn< 6.7*10^-34 GeV (68% C.L.). Our result improves our previous limit (data measured in 2009) by a factor of 30 and the world's best limit by a factor of 5.

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          Author and article information

          Journal
          11 December 2013
          Article
          10.1103/PhysRevLett.112.110801
          1312.3225

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          Phys. Rev. Lett. 112, 110801 (2014)
          5 pages, 2 figures. arXiv admin note: text overlap with arXiv:1011.2143
          gr-qc physics.atom-ph

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