Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 8: Neutrino physics 2

T 8.3: Talk

Monday, March 4, 2024, 16:30–16:45, Geb. 30.22: Gaede-HS

Column Density Determination for the KATRIN Neutrino Mass Measurement — •Christoph Köhler for the KATRIN collaboration — Technische Universität München

The KATRIN experiment aims to model-independently probe the effective electron anti-neutrino mass with a sensitivity of 0.2 eV (90 % CL) by investigating the endpoint region of the tritium beta decay spectrum. To achieve this goal the gas quantity of the windowless gaseous tritium source, characterized by the column density, has to be known with great accuracy.

In this talk we present the principle of measuring the column density with an angular resolved photoelectron source. Further, a method to ensure continuous monitoring of the column density during measurement campaigns of KATRIN is described. The influence of the recent hardware upgrade of the photoelectron source is discussed in light of the column density determination accuracy.

This work is supported by the Technical University of Munich, 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 mass; KATRIN