SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 68: Neutrinos, Dark Matter VIII

T 68.3: Talk

Wednesday, March 22, 2023, 16:20–16:35, POT/0006

Investigation of electron backscattering for the TRISTAN project — •Daniela Spreng — Technical University Munich, James-Franck-Straße 1, 85748 Garching bei München

One open question in the field of neutrino physics is the existence of keV-sterile neutrinos, which would be a possible Dark Matter candidate. They are experimentally accessible through their mixing with the active neutrino flavours and would therefore lead to a kink-like distortion in the beta-decay spectrum. The KATRIN experiment aims to search for this kink-like structure in the tritium beta-decay spectrum by installing a new multi-pixel silicon drift detector named TRISTAN. To resolve the kink, the detector electron response has to be very well understood. In this talk the effect of the backscattering on the detected electron spectrum for different initial electron energies and incident angles will be presented. To analyse these effects, a dedicated test stand was build and measurements were compared to Geant4 simulations.

This project has received funding from the European Research Council (ERC) under the European Union Horizon 2020 research and innovation program (grant agreement No. 852845). This work is supported by BMBF (05A17PM3, 05A17PX3, 05A17VK2, 05A17WO3), KSETA, the Max Planck society, and the Helmholtz Association.