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      Search for exotic spin-dependent interactions using polarized helium

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          Abstract

          We investigate the sensitivity of a search for exotic spin-dependent interactions using polarized \(^{3}\)He with unpolarized mass of BGO and polarized mass of DyIG. The spin-dependent interactions between the polarized nuclear spins of \(^3\)He and the mass induces an effective magnetic field, causing the frequency shift to the precession of \(^{3}\)He. The signal of the \(^{3}\)He nuclear spins can be measured using optically pumped magnetometers which is the most sensitive noncryogenic magnetic-field sensor. A careful design using gradiometers or co-magnetometers can help to reduce the systematics and explore different spin-dependent interactions. An alternative approach is the resonance method proposed by Arvanitaki and Geraci [Phys. Rev. Lett. 113, 161801 (2014)]. The mass movement is modulated at the frequency equal to the Larmor frequency of \(^3\)He. The effective magnetic field induced by spin-dependent interactions can rotate the \(^3\)He nuclear spins. For a given ultra-long relaxation time of polarized \(^3\)He spins, this resonance method could be sensitive to the magnetic field much below \(1\) fT. If the resonance method works, the sensitivity of the spin-dependent interactions can be significantly improved over existing experiments, and new limits on the coupling strengths can be set in the interaction range below \(10^{-1}\) m.

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          Author and article information

          Journal
          06 February 2020
          Article
          2002.02495

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

          Custom metadata
          LA-UR-20-21170
          nucl-ex

          Nuclear physics

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