Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 50: Eingeladene Vorträge (Invited Topical Talks) IV
T 50.2: Eingeladener Vortrag
Mittwoch, 17. März 2021, 14:30–15:00, HS 1
Results and Status of the XENON Dark Matter experiment — •Michael Murra — Institut für Kernphysik (WWU Münster), Münster, Germany
The XENON1T experiment for the direct detection of dark matter with a dual phase time projection chamber (TPC) utilized 3.2 t of liquid xenon. With its 1 (t×yr) data, it sets the most stringent limits on the spin-independent scattering cross section of Weakly Interacting Massive Particles (WIMP) on nucleons for nearly the complete range of WIMP masses above 120 MeV/c2.
The unprecedented low electronic recoil (ER) background allows for other physics searches as well. One example is the first observation of the two-neutrino double electron capture in Xe-124 with a half-live of 1.8×1022 yr, the longest decay ever measured directly. Furthermore, an energy excess at low energies in the ER spectrum was found: Possible origins can come from new particles like axions, a neutrino magnetic moment or from the decay of trace amounts of tritium within the xenon.
The next-generation experiment XENONnT, with 8.4 t of xenon, will not only become one order of magnitude more sensitive to WIMP nucleon interactions, it will also be able to clarify the origin of this low energy excess.
This talk will summarize the most important results from XENON1T and their physics context, and give an update on the XENONnT status, with emphasis on the radon removal system to reach the required xenon radio-purity.