Bounds on New Spin Dependent Forces Between Neutrons Using a $^3$He / $^{129}$Xe Zeeman Maser

ORAL

Abstract

Searches for new spin dependent macroscopic forces place bounds on physics beyond the Standard Model, such as Lorentz symmetry violation and existence of new particles like the axion. We report the first experimental limits on new spin dependent macroscopic forces between neutron spins. We measure the nuclear Zeeman frequencies of a $^3$He / $^{129}$Xe maser while we modulate the nuclear spin polarization of $^3$He in a separate glass cell. We place limits on the coupling strength of dipole potentials mediated by axion-like particles ($g_pg_p$) at the $5.5\times10^{-6}$ level for interactions at ranges longer than 40 cm.

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Authors

  • Alex Glenday

    Harvard-Smithsonian CfA

  • Claire Cramer

    Harvard-Smithsonian CfA

  • David F. Phillips

    Harvard-Smithsonian CfA, Harvard-Smithsonian Center for Astrophysics and Harvard University

  • Ronald L. Walsworth

    Harvard-Smithsonian CfA, Harvard-Smithsonian Center for Astrophysics and Harvard University, Harvard-Smithsonian Center for Astrophysics