Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 79: Suche nach Dunkler Materie 3 (Direkter Nachweis)

T 79.7: Talk

Wednesday, March 29, 2017, 18:25–18:40, VSH 19

Krypton assay in xenon at the ppq level for Xenon1T — •Luisa Hötzsch, Steffen Form, Sebastian Lindemann, and Hardy Simgen for the XENON collaboration — Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany

The Xenon1T experiment aims for the detection of dark matter with a ton scale liquid xenon target for scattering events of Weakly Interacting Massive Particles (WIMPs), which represent one of the main candidates for particle dark matter. Due to the expected very low event rate of this process, ultra-low background conditions are required to reach the sensitivity necessary for WIMP detection. Among the most serious internal background contributions is the radioactive krypton isotope ⁸⁵Kr, a β-emitter which is intrinsically present in commercially available xenon at the ppm or ppb level. However, krypton traces are successfully reduced from liquid xenon by cryogenic distillation. For the purpose of monitoring krypton concentrations in xenon, the Xenon collaboration uses an off-line gas-chromatographic mass spectrometry setup (RGMS), sensitive to krypton in xenon concentrations at the ppq (parts per quadrillion) level.

In this talk, the RGMS setup and its current status will be presented, as well as krypton in xenon measurement results from recent Xenon1T samples.