Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 58: Poster - Astroteilchenphysik
HK 58.2: Poster
Mittwoch, 6. März 2013, 16:45–19:00, HSZ 4.OG
83mKr tracer method to determine the separation factor of a cryogenic distillation column for the XENON1T experiment — •Alexander Fieguth, Ethan Brown, Volker Hannen, Stephan Rosendahl, and Christian Weinheimer for the XENON collaboration — Institut für Kernphysik, Universität Münster
A promising approach to look for dark matter in form of Weakly Interacting Massive Particles (WIMPs) is the use of liquid noble detectors to detect the signals produced when a WIMP scatters off of a target nucleus. The XENON project, using a xenon target for such a detector, has achieved the best sensitivity to the WIMP-nucleon cross section with the XENON100 experiment, placing the most stringent limits to date ofσ<2.0 × 10−45 cm2. The next stage XENON1T aims to achieve an increased sensitivity by using more liquid Xenon and enhanced background suppression. One important background is 85Kr. To reach the necessary level, natural krypton has to be removed to a level <0.5 ppt. Here the technique of cryogenic distillation is used, and a column is under construction to achieve a separation factor of 105. To characterize the column, and to quantify the separation factor, a doping method has been developed using 83mKr, which is no contamination to the system due to its short half-life of 1.83h. 83mKr detectors have been build, which measure the scintillation light produced in xenon with a PMT at different points in the column which allows characterization and determination of the separation factor. The project is funded by DFG and Helmholtz Allianz for Astroparticle Physics HAP.