Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 72: Postersitzung Teilchenphysik
T 72.10: Poster
Dienstag, 28. März 2017, 16:45–19:00, F Foyer
Krypton delayed coincidence and Radon alpha spectrometry analysis at the XENON1T experiment — •Miguel Angel Vargas for the XENON collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster,Münste, Germany
The XENON1T experiment aims at finding direct evidence for dark matter through the scattering of Weakly Interacting Massive Particles (WIMPs) with target nuclei in an ultra-low background dual-phase xenon Time Projection Chamber (TPC) based detector. The detector employs about 3.3 tons of liquid xenon in order to reach a projected sensitivity of 2× 10 −47 cm2 for a WIMP mass of 50 GeV/C2.
Among the most threatening sources to this sensitivity are those from radioactive background such as 85Kr and radon isotopes, which are dispersed inside the entire liquid target and cannot be reduced by making use of the self-shielding properties of xenon. Thus, the importance in understanding these intrinsic contaminants is crucial to ensure the background interpretation of the experiment along to be able to monitor their removal.
This poster focuses on obtaining a coherent picture of these intrinsic radioactive backgrounds by using a delayed coincidence technique for 85Kr,which has a beta-decay with an endpoint energy of 687 keV, and by reconstructing 222Rn or 220Rn subsequent decay products through alpha decay analysis (alpha spectrometry reconstruction)