Search for Axionlike Dark Matter through Nuclear Spin Precession in Electric and Magnetic Fields

We report on a search for ultra- low-mass axion-like dark matterby analysing the ratio of the spinprecession frequencies of stored ultracold neutronsand 199Hg atoms for an axion-induced oscillating electric dipole momentof the neutron and an axion-wind spin- precessioneffect. No signal consistent with dark matteris observed for the axionmass range 1024 eV ma 10 17 eV. Our null resultsets the first laboratory constraints on the coupling of axion dark matterto gluons, which improve on astrophysical limits by up to 3 orders of magnitude, and also improves on previous laboratory constraints on the axioncoupling to nucleons by up to a factor of 40.