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T: Fachverband Teilchenphysik
T 39: Suche nach dunkler Materie II
T 39.8: Vortrag
Montag, 29. Februar 2016, 18:35–18:50, VMP9 SR 28
Characterization of a cryogenic distillation column with a Kr-83m tracer method — •Stephan Rosendahl1, Ion Cristescu2, Alexander Fieguth1, Chrisian Huhmann1, Michael Murra1, and Christian Weinheimer1 — 1Institut für Kernphysik, Wilhelm-Klemm Strasse 9, 48149 Münster — 2Karlsruher Institut für Technologie, Tritium Laboratory, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
The XENON1T experiment aims for the direct detection of dark matter with unreached precision of 2×10−47 cm2 for the spin-independent WIMP-nucleon cross section. The cryogenic distillation is an important tool to reduce the intrinsic contamination with radioactive 85Kr which undergoes a beta-becay with an endpoint energy of 687 keV, being one major source of background. Hence, a novel cryogenic distillation column has been designed and constructed in order to reduce the krypton concentration to natKr/Xe<0.2 ppt.
For the investigation of the performance and the dynamics of the distillation process on the sub-ppt level, a new 83mKr tracer method has been applied. For the 83mKr detection custom made PMT based detectors are used. In this talk the method as well as the results of the studies of the krypton seperation are presented.
Different aspects of the project are funded by DFG-Großgeräte, BMBF and Helmholtz-Alliance for Astroparticle Physics HAP.