Exotic Dark Matter Search with the Majorana Demonstrator.
Phys Rev Lett
; 132(4): 041001, 2024 Jan 26.
Article
in En
| MEDLINE
| ID: mdl-38335333
ABSTRACT
With excellent energy resolution and ultralow-level radiogenic backgrounds, the high-purity germanium detectors in the Majorana Demonstrator enable searches for several classes of exotic dark matter (DM) models. In this work, we report new experimental limits on keV-scale sterile neutrino DM via the transition magnetic moment from conversion to active neutrinos ν_{s}âν_{a}. We report new limits on fermionic dark matter absorption (χ+Aâν+A) and sub-GeV DM-nucleus 3â2 scattering (χ+χ+AâÏ+A), and new exclusion limits for bosonic dark matter (axionlike particles and dark photons). These searches utilize the (1-100)-keV low-energy region of a 37.5-kg y exposure collected by the Demonstrator between May 2016 and November 2019 using a set of ^{76}Ge-enriched detectors whose surface exposure time was carefully controlled, resulting in extremely low levels of cosmogenic activation.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Phys Rev Lett
Year:
2024
Document type:
Article