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T: Fachverband Teilchenphysik
T 52: Suche nach dunkler Materie III
T 52.6: Talk
Wednesday, March 21, 2018, 17:55–18:10, Philo-HS5
The Neutron Veto System for the XENONnT Dark Matter experiment — •Melanie Scheibelhut — Johannes Gutenberg-Universität Mainz, on behalf of the XENON Collaboration
The currently operating XENON1T experiment at the Laboratori Nazionali del Gran Sasso (LNGS) is the first ton-scale dual-phase xenon time projection chamber (TPC) aiming for the direct detection of dark matter in the form of Weakly Interacting Massive Particles (WIMPs). It has achieved world-leading sensitivity with its first science exposure of 34.2 live days, and has meanwhile taken a full year of dark matter search and calibration data. While XENON1T is exploring the WIMP spin-independent cross-section in the few 10−47 cm2 regime, the collaboration is already preparing the upgraded experiment XENONnT with about 8 tons of LXe, aimed at a further order of magnitude in sensitivity improvement. In order to maximize the fiducial volume free of nuclear recoils, we are working towards a neutron veto system based on Gd-loaded liquid scintillator. We report on Monte Carlo simulations and first validation measurements.