Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 49: Neutrino Physics without Accelerators 4
T 49.6: Vortrag
Dienstag, 22. März 2022, 17:40–17:55, T-H34
Column Density Determination for the KATRIN Neutrino Mass Measurement — •Christoph Köhler1, Fabian Block2, and Alexander Marsteller2 for the KATRIN collaboration — 1Technical University of Munich/Max Planck Institute for Physics — 2Karlsruhe Institute of Technology
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.
We present in this talk the principle of measuring the column density with an angular resolved photoelectron source and report on the monitoring accuracy of the column density achieved with dedicated activity monitoring devices in the first five measurement campaigns of KATRIN. The influence of the column density uncertainty on the neutrino mass determination is then discussed in light of KATRIN's world-leading direct upper limit on the neutrino mass and the ongoing further data-taking.
This work is supported by the Technical University of Munich, the Max Planck Society, the Helmholtz Association (HGF), the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3), the Helmholtz Alliance for Astroparticle Physics (HAP), the GRK 1694, and the Helmholtz Young Investigator Group (VH-NG-1055).