Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 43: Poster session Particle Physics

T 43.6: Poster

Tuesday, March 31, 2020, 17:00–18:30, Grotte

Calibration Measurements with ^83mKr Conversion Electrons at KATRIN — •Matthias Böttcher for the KATRIN collaboration — Institut für Kernphysik, WWU Münster

The Karlsruher Tritium Neutrino Experiment (KATRIN) aims at measuring the effective electron neutrino mass with the unprecedented sensitivity of 0.2 eV by measuring the energy spectrum of tritium β-decay electrons. The non-zero neutrino mass established in oscillation experiments introduces a change of the shape of the electron spectrum near the endpoint energy. The first neutrino mass result published recently by the KATRIN experiment gives a new upper limit of 1.1 eV (90 % C.L.). To improve on this limit, a detailed analysis of systematic effects in the tritium source and the main spectrometer is required. One of the tools to assess systematic uncertainties in KATRIN is the use of Krypton-83m as a calibration source, which provides mono-energetic conversion electrons. Gaseous ^83mKr can be injected into KATRIN’s windowless gaseous tritium source (WGTS) and can be used, among others, to study the effect of inhomogeneities in the tritium plasma. We describe in this poster the use of ^83mKr for investigating WGTS and spectrometer properties and their influence on systematic uncertainties in the neutrino mass measurements.

This work is supported by BMBF under contract number 05A17PM3.