DELight: A Direct search Experiment for Light dark matter with superfluid helium
B. von Krosigk, K. Eitel, C. Enss, T. Ferber, L. Gastaldo, Felix Kahlhoefer, Sebastian Kempf, Markus Klute, S. Lindemann, M. Schümann, F. Toschi, K. Valerius
Abstract
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 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi/> <mml:mn>4</mml:mn> </mml:msup> </mml:math> 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.