SMuK 2023 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 10: Structure and Dynamics of Nuclei II
HK 10.3: Talk
Monday, March 20, 2023, 17:15–17:30, SCH/A215
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 83mKr conversion electrons are used for calibration purposes of different (astro-)particle physics experiments due to the narrow 83mKr line widths and short 83mKr half-life. In the KArlsruhe TRItium Neutrino experiment (KATRIN), that currently provides the best neutrino mass upper limit of 0.8 eV/c2 (90% C. L.) in the field of direct neutrino-mass measurements, several systematic uncertainties are studied by a shape distortion of the quasi monoenergetic 83mKr spectrum. This creates high demands on precise knowledge of the undistorted spectrum.
In KATRIN we use the 32 keV N-lines lying in the high energy region of the spectrum including the weaker N1 line. In this talk, results of a dedicated measurement of the 83mKr electron N-spectrum with emphasis on N1 line position and width conducted at unprecedented precision at KATRIN will be presented.
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).