SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Astroparticle Physics II

HK 72.2: Vortrag

Donnerstag, 23. März 2023, 16:00–16:15, SCH/A252

krypton level measurement in XENONnT and beyond — •ying-ting lin, steffen form, matteo guida, robert hammann, hardy simgen, and jonas westermann for the XENON collaboration — Max-Planck Institut fur Kernphysik, Heidelberg, Germany

The XENONnT experiment is in search of dark matter and other rare physical phenomena via a ton-scale liquid-xenon detector. To reach its target sensitivity, competing background has to be suppressed to unprecedented level. One main internal background is the pure beta-emitter, ⁸⁵Kr. With dedicated purification system in XENONnT, the krypton concentration over xenon can be reduced down to 100 ppq (parts per quadrillion 10⁻¹⁵). Precisely quantifying the ⁸⁵Kr remnant in this ultra pure xenon detector is therefore an important and challenging task. The rare gas mass spectrometer (RGMS) at MPIK Heidelberg is capable of performing such measurement by a two stage process: applying a gas-chromatographic separation of krypton from xenon and tracing the amount of Kr gas using a mass spectrometer. For future low-background liquid-xenon detectors, a fully automatic rare gas mass spectrometer (AutoRGMS) is under development. The AutoRGMS will be a major improvement in reducing the complexity and duration of its operations, and thus allow frequent krypton monitoring. The highlight will cover both the results from RGMS and the progress toward AutoRGMS.