Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 43: Neutrino physics without accelerators II
T 43.1: Vortrag
Dienstag, 16. März 2021, 16:00–16:15, Tr
Column Density Determination for the KATRIN Neutrino Mass Measurement — Fabian Block1, •Christoph Köhler2, and Alexander Marsteller1 for the KATRIN collaboration — 1Karlsruhe Institute of Technology — 2Technical University of Munich/Max Planck Institute for Physics
The KATRIN experiment aims to model-independently probe the effective electron anti-neutrino mass with a sensitivity of 0.2 eV (90% C.L.) 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.
This contribution describes the principle of measuring the column density with an angular resolved photoelectron source. Moreover, we report on the monitoring accuracy of the column density achieved with dedicated activity monitoring devices in 5 and 7 weeks long neutrino mass 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).