Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 102: Neutrino Physics IX
T 102.6: Vortrag
Freitag, 4. April 2025, 10:15–10:30, VG 3.104
83mKr N-line spectrum measurement at KATRIN — •Jaroslav Storek1 and Matthias Böttcher2 for the KATRIN collaboration — 1Institute for Astroparticle Physics, Karlsruhe Institute of Technology — 2Institute of Nuclear Physics, University of Münster
Conversion electrons from 83mKr are used as a versatile calibration tool in a range of different (astro-)particle physics experiments. Favourable properties are the short half-life and narrow line spectrum of 83m-Kr as a nuclear standard. In the KArlsruhe TRItium Neutrino experiment (KATRIN) which currently provides the best direct neutrino mass upper limit of 0.45 eV/c2 (90% C. L.), 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. Results of a dedicated measurement of the 83mKr electron N-spectrum with emphasis on N1 line and adjacent shake lines will be presented in this talk.
This work is supported by the Helmholtz Association and by the Ministry for Education and Research BMBF (grant numbers 05A23PMA, 05A23PX2, 05A23VK2 and 05A23WO6) 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).
Keywords: krypton N lines; KATRIN