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T: Fachverband Teilchenphysik

T 8: Neutrino physics 2

T 8.4: Vortrag

Montag, 4. März 2024, 16:45–17:00, Geb. 30.22: Gaede-HS

Evolution of the KATRIN energy scale measured with 83mKr. — •Justus Beisenkötter and Matthias Böttcher for the KATRIN collaboration — Universität Münster

To study the energy scale of KATRIN, which is influenced by beamline workfunctions and plasma effects in the gaseous tritium source, 83mKr conversion electron lines are used. Gaseous 83mKr is inserted into the tritium source, which allows us to measure energy shifts and broadenings of the conversion lines that also affect the beta spectrum. This talk gives an overview of the time evolution of the line position of the 83mKr L3-32 and N23-32 lines, which were measured throughout the KATRIN operation. We also present the evolution of the radial dependent coupling of rear wall bias voltage to the line positions and the optimal value for chosen rear wall bias, which are monitored using 83mKr conversion electrons. This work is supported by the Helmholtz Association and by the Ministry for Education and Research BMBF (grant numbers 05A23PMA, 05A23PX2, 05A23VK2, and 05A23WO6)

Keywords: neutrino physics; KATRIN; 83m-krypton; systematic measurements