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Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 43: Poster session Particle Physics

T 43.9: Poster

Dienstag, 31. März 2020, 17:00–18:30, Grotte

Column density determination in KATRIN’s first neutrino mass measurement — •Fabian Block1, Christoph Köhler2, and Alexander Marsteller11Karlsruhe Institute of Technology — 2Technical University of Munich/Max Planck Institute for Physics

The KATRIN experiment aims to probe model-independently 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. The experimental setup of KATRIN consists of a high-luminosity Windowless Gaseous Tritium Source (WGTS), from which the beta-electrons are magnetically guided to the spectrometer and detector section, which measures the integrated beta decay spectrum.

The neutrino mass analysis requires exact knowledge of the WGTS column density, which is a measure of the gas amount inside the WGTS. The principle of column density measurements and achievements for the precise monitoring of the column density with several monitoring devices during the first neutrino-mass measurement campaign is described. The influence of the column density uncertainty on the neutrino mass is then discussed in light of KATRIN’s world-leading direct upper limit on the effective electron anti-neutrino mass.

This work is supported by 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).

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