München 2019 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 43: Astroparticle Physics III
HK 43.4: Vortrag
Mittwoch, 20. März 2019, 17:30–17:45, HS 16
Measurement of KATRINs energy loss function using a time of flight method — •Caroline Rodenbeck and Rudolf Sack for the KATRIN collaboration — WWU Münster
The Karlsruhe Tritium Neutrino experiment (KATRIN) is a next generation tritium beta decay experiment improving the sensitivity on direct neutrino mass measurements by one order of magnitude over the predecessor experiments. It allows a model independent investigation of the absolute neutrino mass scale with an estimated sensitivity of 0.2 eV/c2 (90% C.L.)
Understanding energy losses of electrons inside the windowless gaseous tritium source (WGTS) of KATRIN is essential for measuring the tritium beta decay spectrum with the required precision. The electrons can scatter elastically and inelastically off tritium molecules in the WGTS loosing energy in the process and resulting in a modification of the spectrum.
The talk presents a high resolution measurement of the shape of this energy loss function, which was obtained using a time of flight method with monoenergetic electrons from a photoelectron source at the endpoint energy of the tritium beta spectrum of 18.6 keV.
This work is funded by DFG through the Research Training Group 2149 and by BMBF under contract number 05A17PM3.