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T: Fachverband Teilchenphysik
T 79: Suche nach Dunkler Materie 3 (Direkter Nachweis)
T 79.1: Gruppenbericht
Mittwoch, 29. März 2017, 16:45–17:05, VSH 19
Searching for low-mass Dark Matter with EDELWEISS — •Valentin Kozlov — Karlsruher Institut für Technologie, Institut für Experimentelle Kernphysik, Gaedestr. 1, 76128 Karlsruhe
The EDELWEISS experiment uses Germanium low-temperature detectors with heat and ionization readout for direct dark matter search. These advanced high-purity detectors are operated at 18 mK in a low-radioactivity environment of the Modane underground laboratory (LSM, France). Eight detectors with best energy resolutions were selected for low-mass WIMP analysis from a total set of 20 detectors operated in a long-term campaign. Boosted Decision Tree and likelihood approaches were used to analyze acquired data and show up to two orders of magnitude improvement with respect to the previous EDELWEISS-II low-mass WIMP search for 7 GeV/c2 WIMPs. The current R&D program concentrates on further improvements of ionization and heat baseline resolutions, and use of voltage-assisted heat amplification technique (so-called Neganov-Luke mode). Significant improvement in sensitivity can be realized with a moderate exposure of 350 kg.d at actual background conditions within the next 1-2 years. Beyond 2018 the already existing cooperation with SuperCDMS should lead to a common experimental infrastructure in SNOLAB. Recent results, current R&D activities, sensitivity projections and the project towards the SNOLAB cryogenic facility will be discussed.