Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 15: Experimental methods I
T 15.3: Talk
Monday, March 15, 2021, 16:30–16:45, To
Angular selective detection of electrons with a microchannel plate detector — •Patrick Oelpmann, Kevin Gauda, Volker Hannen, Tim König, Alexey Lokhov, Hans-Werner Ortjohann, and Christian Weinheimer — Institut für Kernphysik, Münster, Deutschland
The Karlsruhe Tritium Neutrino Experiment (KATRIN) aims at determining the electron neutrino mass with a sensitivity of 0.2 eV/c2 from a precision measurement of the tritium β-decay spectrum. The analysis of the first science run allowed to set a new upper limit of 1.1 eV/c2 at 90 % confidence level.
To reach the target sensitivity an ultra-low background is a key requirement. However, currently the background in KATRIN exceeds its design value, creating demand for new techniques of background reduction. To this end, several background suppression methods have been proposed or have already been implemented. A promising idea is to make use of the different angular distribution of electrons produced in tritium β-decay compared to those produced by the dominant background mechanism, which is ionization of Rydberg states in the volume of the KATRIN main spectrometer. The talk will focus on first tests of angular selective detection of electrons with microchannel plate detectors.
This project is supported by BMBF under contract number 05A20PMA.