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SYMD: Symposium SMuK Dissertation Prize 2020
SYMD 1: SMuK Dissertation Prize 2020
SYMD 1.2: Hauptvortrag
Montag, 30. März 2020, 15:00–15:30, H-Aula/HS I/HS X
First observation of double electron capture in Xe-124 with the dark matter detector XENON1T — •Alexander Fieguth — Stanford University, 94305 Stanford, CA, USA
For almost a century observations point towards a non-luminous and non-baryonic form of matter, which we call Dark Matter. This elusive constituent of the universe has evaded a direct detection despite the fact about 80% of the total mass content of the universe are made of it. One of the most sensitive detectors built for the purpose of directly observing an interaction with Dark Matter was the XENON1T detector. While setting the most stringent limits on the standard interaction of Weakly Interacting Massive Particles (WIMPs) with masses above a few GeV/c2, no positive signal was observed.
However, the efforts necessary to reach sensitivities which probe cross sections as low as 10−47cm2, especially in terms of background mitigation, understanding and reduction, made this detector an exciting tool for exploring various so far un-probed parameter spaces in particle and nuclear physics.
This talk will focus on the utilization of XENON1T as a detector for the two-neutrino double electron capture of 124Xe. A process which is within the Standard Model of particle physics but due to its long half-life (1.8 ×1022 yrs), has not been observed directly before. In addition to this, the talk will shed some light on standard assumptions in the search for direct dark matter interaction and introduce a new interaction channel through a WIMP-Pion interaction, which was tested for the first time using XENON1T.