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T: Fachverband Teilchenphysik
T 49: Neutrino Physics without Accelerators 4
T 49.7: Vortrag
Dienstag, 22. März 2022, 17:55–18:10, T-H34
83mKr N-line spectrum measurement at KATRIN — Matthias Böttcher1, Moritz Machatschek2, Magnus Schlösser2, and •Jaroslav Storek2 for the KATRIN collaboration — 1Institute of Nuclear Physics, University of Münster — 2Institute for Astroparticle Physics, Karlsruhe Institute of Technology
The KArlsruhe TRItium Neutrino experiment currently provides the best neutrino mass upper limit of 0.8 eV/c2 (90% C. L.) in the field of direct neutrino-mass measurements. This result has been obtained with only 5% of the anticipated total measurement time. However, reaching the target sensitivity of 0.2 eV/c2 at 90% C. L. not only requires the full measurement time, but also the detailed study of systematic measurement uncertainties. Several of them can be studied by measuring a shape distortion of the 83mKr intrinsic electron conversion N-lines which creates high demands on precise knowledge of the undistorted spectrum. Results of a dedicated measurement of the intrinsic 83mKr N-spectrum conducted at unprecedented precision at KATRIN will be presented in this talk.
This work is supported by the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3) and the Doctoral School "Karlsruhe School of Elementary and Astroparticle Physics: Science and Technology (KSETA)" through the GSSP program of the German Academic Exchange Service (DAAD).