Bonn 2020 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 92: Neutrino physics without accelerators VIII

T 92.6: Vortrag

Freitag, 3. April 2020, 12:15–12:30, H-HS II

Measurement of the Energy Loss Spectrum of 18.6 keV Electrons in Tritium at KATRIN — •Caroline Rodenbeck for the KATRIN collaboration — Institut für Kernphysik, WWU Münster

The Karlsruhe Tritium Neutrino experiment (KATRIN) measures the beta decay spectrum of a windowless gaseous tritium source (WGTS) for a model independent investigation of the absolute neutrino mass scale with an estimated sensitivity of 0.2 eV/c2 (90% C.L.).

Beta decay electrons can scatter elastically and inelastically off tritium molecules inside the WGTS and lose energy in the process. A precise description of the the energy loss shape is provided by measurements with a pulsed photo-electron source, shooting mono-energetic electrons through the WGTS. By applying a time-of-flight cut a differential energy loss spectrum is obtained.

The energy loss and the resulting response function of the experiment are essential for neutrino mass analysis of the beta decay spectrum and are used in the analysis of the recent KATRIN neutrino mass runs. The talk will give an overview on the measurements and the analysis to obtain the energy loss function and an insight on how KATRIN’s response function is constructed. This work is funded by BMBF under contract number 05A17PM3.

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