Abstract
The nEDM apparatus at PSI has been used to search for different dark matter signatures utilizing its high sensitivity to shifts in the neutron precession frequency and its well-controlled low magnetic field at the \muμT level. Such a shift could be interpreted as a consequence of a short-range spin-dependent interaction that could possibly be mediated by axions or axion-like particles, or as an axion-induced oscillating electric dipole moment of the neutron. Another search, based on so-called UCN disappearance measurements, targeted previously reported signals of neutron to mirror-neutron oscillations. These dark matter searches confirmed and improved previous results, as detailed in this review.
Highlights
Apart from searching for the electric dipole moment of the neutron, the neutron electric dipole moment (nEDM) apparatus at PSI (Section 27 [1]) is an excellent tool to search for signatures of dark matter particles
ultracold neutrons (UCN) disappearance experiments were conducted with this apparatus [4] to search for dark matter signatures
It has been proposed starting from the fifties that there could be a mirror copy of the Standard Model (SM) particles, restoring parity conservation in the weak interaction on the global level
Summary
Apart from searching for the electric dipole moment of the neutron, the nEDM apparatus at PSI (Section 27 [1]) is an excellent tool to search for signatures of dark matter particles. The first potential signature studied was a high precision measurement of the shift in the ratio of the spin-precession frequencies of ultracold neutrons (UCN) and 199Hg atoms. UCN disappearance experiments were conducted with this apparatus [4] to search for dark matter signatures It has been proposed starting from the fifties that there could be a mirror copy of the Standard Model (SM) particles, restoring parity conservation in the weak interaction on the global level. A comparison to previous constraints on model parameters will be given
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