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HK: Fachverband Physik der Hadronen und Kerne
HK 57: Astroparticle Physics 3
HK 57.5: Vortrag
Donnerstag, 26. März 2015, 18:30–18:45, K/HS1
Removal of noble gases out of xenon by a cryogenic distillation column for the XENON1T experiment — •Alexander Fieguth, Michael Murra, Stephan Rosendahl, Gianmarco Bruno, Sergej Schneider, Christian Weinheimer, and Christian Huhmann — Institut für Kernphysik, WWU Münster
The upcoming XENON1T experiment is the next step for the dark matter particle search. It will surpass current limits on the WIMP-nucleon cross section set by liquid xenon detectors as LUX and XENON100 by more than an order of magnitude, which leads to an expected sensitivity of 2.0 * 10−47 cm2 for WIMPs with a mass of 50 GeV/c2 after a 2.2 ton-year live-time. For achieving new sensitivity limits the reduction of internal background sources as 85Kr and 222Rn is of crucial importance. Taking advantage of the different boiling points of these noble gas impurities and xenon, they can be separated by a cryogenic distillation column in different steps. The improvement of the krypton removal by distillation for the XENON1T experiment and a first test setup on radon distillation at the XENON100 experiment will be presented. Different aspects of this project have been funded by DFG-Großgeräte, BMBF and Helmholtz-Alliance for Astroparticle Physics (HAP).