Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 43: Poster session Particle Physics
T 43.5: Poster
Tuesday, March 31, 2020, 17:00–18:30, Grotte
Investigations of systematics on the energy loss measurement of electrons in the KATRIN source — •Lutz Schimpf and Christophe Schwachtgen — ETP, Karlsruhe Institute of Technology (KIT)
The Karlsruhe Tritium Neutrino experiment (KATRIN) is targeted to measure m(νe) with a sensitivity of 200 meV at 90 % confidence level. To determine the neutrino mass, an integrated beta-decay spectrum close to the endpoint is measured and a fit to the data comprising the neutrino mass as a free parameter is performed. A number of systematic effects on the measured spectrum need to be taken into account in the analysis. One of these is the energy loss from inelastic scatterings of beta-electrons with the source gas. A very precise measurement and reliable uncertainty estimate are required for fitting the beta-decay spectrum. This is achieved by measuring the energy loss of quasi-monoenergetic electrons at 18.6 keV traversing the gaseous Tritium source in both an integral and a differential way. To assess the systematic error budget of the measured energy loss function, the uncertainties arising from various parameters, such as source pressure, rate stability, and background need to be investigated by Monte Carlo error propagation. This contribution presents the resulting error estimate and discusses its impact on the neutrino-mass sensitivity. 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), KSETA, and the Helmholtz Young Investigator Group (VH-NG-1055).