Bonn 2020 – wissenschaftliches Programm
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T 23.5: Gruppenbericht
Dienstag, 31. März 2020, 18:05–18:25, H-HS I
Low-mass Dark Matter Search with CRESST-III — •Margarita Kaznacheeva for the CRESST collaboration — Physik-Department E15, Technische Universität München, D-85747 Garching, Germany
The CRESST-III (Cryogenic Rare Event Search with Superconducting Thermometers) experiment is dedicated to one of the most exciting open questions in modern astroparticle physics - revealing the nature of dark matter (DM). It uses scintillating single crystals operated as cryogenic calorimeters at mK temperatures and is equipped with transition-edge-sensors. In order to achieve the required ultra-low backgrounds, the detectors are surrounded by layers of radiopure shielding materials and installed at the deep underground facility of the Laboratori Nazionali del Gran Sasso. The light produced by particle interactions in scintillating crystals is measured by a separate cryogenic light detector, which enables particle discrimination between nuclear recoils (signal) and electron recoils (dominant background) on an event-by-event basis. With a new generation of CRESST detectors an ultra-low energy threshold of 30 eV has been achieved, which makes CRESST the leading experiment in sub-GeV DM searches. In this talk, I will give an overview of the experiment and present the latest DM data, which improved the sensitivity to spin-independent DM scattering down to masses of 160 MeV. Moreover, I will give an update on recent R&D efforts and conclude with the future perspectives of CRESST.