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T: Fachverband Teilchenphysik

T 81: Neutrino Physics VI

T 81.2: Vortrag

Donnerstag, 3. April 2025, 16:30–16:45, VG 3.103

Monte Carlo Simulation for Electron Scattering in the KATRIN Tritium Source — •Leo Laschinger for the KATRIN collaboration — Technische Universität München — Max-Planck-Institut für Kernphysik, Heidelberg

The KATRIN experiment is designed and currently being operated to measure the effective electron antineutrino mass by studying the endpoint region of the tritium beta decay spectrum. It also provides an opportunity to search for keV-scale sterile neutrinos. To that end, an investigation of the full beta spectrum is planned after the completion of the neutrino mass campaign. Electron scattering on tritium molecules in the gaseous tritium source is an important systematic effect in the KATRIN experiment, both for the ongoing neutrino mass measurement and for the upcoming search for keV-scale sterile neutrinos. In order to model this effect and its impact on the measured beta spectrum, an event-by-event Monte Carlo simulation utilizing Markov Chains for efficient cross section sampling has been developed. In this talk, I will present the working principles of the simulation, highlight the key results obtained, and discuss their implications for the KATRIN analysis. This work is supported by the Helmholtz Association and by the Ministry for Education and Research BMBF (grant numbers 05A23PMA, 05A23PX2, 05A23VK2 and 05A23WO6). This project has received funding from the European Research Council (ERC) under the European Union Horizon 2020 research and innovation programme (grant agreement No. 852845).

Keywords: Neutrino; Simulation; Monte Carlo; KATRIN; Scattering