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HK: Fachverband Physik der Hadronen und Kerne

HK 29: Astroparticle Physics II

HK 29.7: Vortrag

Dienstag, 19. März 2019, 18:15–18:30, HS 18

Measurement of Rn-222 in water samples — •Judith Gafriller — Max-Planck-Institut für Kernphysik, Heidelberg

XENON1T is currently the most sensitive experiment for direct dark matter search. In order to reduce background events generated by radioactive decays or cosmic rays, the detector is surrounded by a water tank acting as a passive shield as well as an active Cherenkov veto system. For the upgrade XENONnT, the sensitivity will be further improved by enriching the water veto with Gadolinium. It will allow to capture and detect neutrons created within the detector materials. In order to check whether the trigger rate of the neutron veto system is sufficiently low a radon background study is necessary. For measuring radon in water a gas drying and purifying method was developed which supports the well established technique of sensitive radon measurements with proportional counters. In this talk the elaborated gas drying system and the results of the measurements will be discussed.