To reach ultra-low detection thresholds necessary to probe unprecedentedly low Dark Matter masses, target material alternatives and novel detector designs are essential. One such target material is superfluid ^4 4 He which has the potential to probe so far uncharted light Dark Matter parameter space at sub-GeV masses. The new “Direct search Experiment for Light dark matter”, DELight, will be using superfluid helium as active target, instrumented with magnetic micro-calorimeters. It is being designed to reach sensitivity to masses well below 100 MeV in Dark Matter-nucleus scattering interactions.
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Krosigk et al. (2023) studied this question.
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