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T: Fachverband Teilchenphysik
T 7: Direkte Suche nach Dunkler Materie I
T 7.6: Vortrag
Montag, 25. März 2019, 17:20–17:35, H09
The Gd-loaded water Cherenkov neutron veto of the XENONnT experiment — •Daniel Wenz for the XENON collaboration — Institut für Physik & Exzellenzcluster PRISMA, J. Gutenberg-Universität Mainz, 55099 Mainz, Germany
The XENON1T experiment searching for direct detection of Dark Matter at the Laboratori Nazionali del Gran Sasso in Italy has set in 2018 the world-leading limit on the spin-independent cross-section between nucleon and the Dark Matter candidate Weakly Interacting Massive Particle (WIMP), and is now undergoing an upgrade with a larger dual-phase xenon Time Projection Chamber, XENONnT. The new detector will employ more 8 tonnes of xenon, improving by one order of magnitude the sensitivity to the WIMP-nucleon spin-independent cross-section to ∼ 2×10−48 cm2. In addition, the current water Cherenkov Muon Veto system surrounding the XENONnT cryostat will be integrated with a new neutron veto system, based on the use of gadolinium-loaded water. In this talk we describe the implementation of the new neutron veto detector and the plans for its calibration, and we show its beneficial impact on the residual neutron background that could otherwise affect the XENONnT goal sensitivity.