Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 43: Neutrino physics without accelerators II

T 43.6: Talk

Tuesday, March 16, 2021, 17:15–17:30, Tr

Spectrocopy of Kr-83m Conversion Electron Lines for Plasma Investigations at KATRIN — •Matthias Böttcher — 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 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. In this talk, the spectroscopy of ^83mKr for investigating plasma inhomogeneities is presented.

This work is supported by BMBF under contract number 05A20PMA.