Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 55: Neutrinophysik VII

T 55.8: Talk

Wednesday, March 21, 2018, 18:15–18:30, Z6 - HS 0.001

Background measurements at KATRIN — •Anna Pollithy for the KATRIN collaboration — Technische Universität München (TUM), Fakultät für Physik, 85748 Garching

The Karlsruhe Tritium Neutrino (KATRIN) experiment is designed to determine the effective electron anti-neutrino mass with a sensitivity of m_ν=0.2 eV/c² (90 % C.L.) in a model-independent way by investigating the energy spectrum of tritium beta decay electrons near the endpoint. For the full neutrino mass sensitivity, a background level of 10⁻² cps is required. One way to characterize the residual background in KATRIN is by determining its energy spectrum. This background information enables to verify the current "Rydberg" background hypothesis which predicts low energy electrons originating from highly excited atoms as a potential background source. In this contribution, two dedicated measurement methods to investigate the "Rydberg" background as well as first results will be presented. This work is supported by the SFB1258 and the Max Planck Society.