Aachen 2019 – scientific programme
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T: Fachverband Teilchenphysik
T 33: Neutrino-Detektoren I
T 33.10: Talk
Tuesday, March 26, 2019, 18:15–18:30, S07
Ionisation of Pb-210 induced Rydberg atoms in the KATRIN experiment — •Dominic Hinz for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), ETP, Postfach 3640, 76021 Karlsruhe
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to measure the effective neutrino mass of electron anti neutrinos in a model-independent way by precise determination of the beta-spectrum of molecular tritium. Dedicated commissioning measurements showed that the sensitivity is affected by background electrons which are correlated to radioactive decays of a 210Pb contamination of the inner spectrometer surfaces. To achieve the sensitivity of mν= 0.2 eV/c2 (90% C.L.) on the effective neutrino mass, knowledge of statistical and systematic uncertainties as well as the background processes is essential. The sensitivity of the KATRIN experiment is currently limited by a higher than anticipated background. Therefore, an understanding of the remaining background processes induced by radioactivity is of high relevance. The background model presented in this talk describes the generation of background electrons by ionisation of atoms in excited states which are sputtered from the main spectrometer vessel by alpha decays of 210Po, a daughter nuclei of long-living 210Pb.
This work was supported by BMBF (05A17VK2) and the HGF.