An exotic dark matter search with the Majorana Demonstrator

With its excellent energy resolution and ultra-low backgrounds, the high-purity germanium detectors in the Majorana Demonstrator enable several searches for beyond the Standard Model physics ranging from the primary neutrinoless double beta decay search to searches for several classes of exotic dark matter models. Many of these dark matter models predict a peaked signature in an energy spectrum, which can be clearly resolved by germanium detectors. The Majorana detectors were operated in a low-background shield at the Sanford Underground Research Facility, and our search utilizes the 1–100 keV region of a 37 kg-year exposure collected between May 2016 and November 2019. In this talk, we present new experimental limits for keV-scale sterile neutrino dark matter, fermionic dark matter absorption, sub-GeV dark matter 3-2 body scattering, and bosonic dark matter.