2000 character limit reached
New Limit on Axion-Like Dark Matter using Cold Neutrons (2204.01454v2)
Published 4 Apr 2022 in hep-ex and physics.ins-det
Abstract: We report on a search for dark matter axion-like particles (ALPs) using a Ramsey-type apparatus for cold neutrons. A hypothetical ALP-gluon-coupling would manifest in a neutron electric dipole moment signal oscillating in time. Twenty-four hours of data have been analyzed in a frequency range from 23 $\mu$Hz to 1 kHz, and no significant oscillating signal has been found. The usage of present dark-matter models allows to constrain the coupling of ALPs to gluons in the mass range from $10{-19}$ to $4 \times 10{-12}$ eV. The best limit of $C_G$/$f_a m_a = 2.7 \times 10{13}$ GeV${-2}$ (95% C.L.) is reached in the mass range from $2 \times 10{-17}$ to $2 \times 10{-14}$ eV.