Searching for low-mass dark matter particles with a massive Ge bolometer operated above ground

By E. Armengaud, C. Augier, A. Benoit, L. Berg'e, J. Billard, A. Broniatowski, P. Camus, A. Cazes, M. Chapelier, F. Charlieux and 30 more. Physical Review D, 2019

179 citations recorded by the source corpus.

The EDELWEISS Collaboration has performed a search for dark matter particles with masses below the GeV scale with a 33.4-g germanium cryogenic detector operated in a surface lab. The energy deposits were measured using a neutron-transmutation-doped Ge thermal sensor with a 17.7 eV (rms) baseline heat energy resolution leading to a 60 eV analysis energy threshold. Despite a moderate lead shielding and the high-background environment, the first sub-GeV spin-independent dark matter limit based on a germanium target has been achieved. The experiment provides the most stringent, nuclear-recoil-based, above-ground limit on spin-independent interactions above 600 MeV/c2. The experiment also provides the most stringent limits on spin-dependent interactions with protons and neutrons below 1.3 GeV/c2. Furthermore, the dark matter search results were studied in the context of strongly interacting massive particles, taking into account Earth-shielding effects, for which new regions of the available parameter space have been excluded. Finally, the dark matter search has also been extended to interactions via the Migdal effect, resulting for the first time in the exclusion of particles with masses between 45 and 150 MeV/c2 with spin-independent cross sections ranging from 10-29 to 10-26 cm2.

Subfields: Atomic and Molecular Physics, and Optics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/9a3770c8f3fd612308eb62689bfd799fdb1e1e70

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Direct detection of strongly interacting sub-GeV dark matter via electron recoils (2019, methodology): “4, top left), we also show constraints from nuclear recoil DMsearches by XENON1T [93], CRESSTIII [94, 95], the CRESST 2017 surface run [96] as obtained in [53], and Migdal effect based bounds from EDELWEISS [46] and CDEX [97], together with constraints from the X-ray Quantum Calorimeter experiment (”