Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 8: Neutrino physics 2

T 8.5: Talk

Monday, March 4, 2024, 17:00–17:15, Geb. 30.22: Gaede-HS

Absolute ^83mKr transition energy determination using the Gaseous Krypton Source of the KATRIN experiment — •Benedikt Bieringer and Matthias Böttcher for the KATRIN collaboration — Institute for Nuclear Physics, University of Münster

The KATRIN experiment aims to determine the neutrino mass with a sensitivity better than 0.3 eV/c² at 90 % CL. An important cross check to verify the analysis is the comparison of the Q-value derived from the measured endpoint of the tritium beta spectrum to values from literature. This is achieved by calibration of the energy scale with conversion electrons from a gaseous ^83mKr source. However, reaching the desired accuracy requires an unprecedented knowledge of the energy of ^83mKr gamma transitions.

This talk presents first results on improving the knowledge on the transition energies through a measurement of conversion electron lines for all three ^83mKr gamma transitions using a high-luminosity Gaseous Krypton Source. The measurement follows the recent, first direct measurement of the highest ^83mKr gamma transition, performed with the Condensed Krypton Source of the KATRIN experiment.

This work is supported by the Helmholtz Association and by the Ministry for Education and Research BMBF (grant numbers 05A23PMA, 05A23PX2, 05A23VK2 and 05A23WO6).