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The direct search experiment for dark matter XENON1T is located at the Italian underground laboratory LNGS. It uses a dual-phase time projection chamber with a detector mass of 2 t of liquid Xenon. With its exposure of 1 t*yr 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.
XENON1T's unprecedented low background originates from very careful material selecting and screening as well as from active removal of Kr-85 by cryogenic distillation. The low background rate 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-life of 1.8x10^22 yrs, the longest decay ever measured directly. Furthermore, an excess at low energies in the electron recoil spectrum was found: A possible origin of this excess can be new particles like axions from the Sun or a magnetic moment of neutrinos or the decay of trace amounts of Tritium within Xenon.
The next-generation experiment XENONnT, with 6 t of Xenon in the inner dual-phase time projection chamber, 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. To achieve this, the intrinsic background of the experiment has to be again one order of magnitude lower.
The talk will summarise the most important results from XENON1T and present the first results from the commissioning of the follow-up experiment XENONnT.
This is a VIDEO COLLOQUIUM!
Connection Details:
https://zoom.us/j/94043737272?pwd=MENvaTByM3FFL2J5cU1pUHpKMjNNUT09