Hamburg 2016 – scientific programme
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T: Fachverband Teilchenphysik
T 23: Postersitzung
T 23.2: Poster
Monday, February 29, 2016, 13:30–14:30, VMP4 Foyer
Overview of recent and current spectroscopic investigations with hydrogen isotopologues for KATRIN — •Tim Brunst, Sebastian Mirz, Robin Größle, and Bennet Krasch for the KATRIN collaboration — Karlsruhe Institute of Technology (KIT), Institute for Technical Physics (ITEP), Tritium Laboratory Karlsruhe (TLK)
The Karlsruhe Tritium Neutrino Experiment (KATRIN) investigates the energy spectrum of the tritium β decay near its energetic endpoint in order to determine the electron anti-neutrino mass with a sensitivity of 200 meV/c2 (90 % C.L.). Therefore, molecular tritium gas is decaying in a windowless gaseous tritium source (WGTS). The physical properties of the gas in the WGTS, like composition, ortho/para ratio or rotational population, need to be stabilised on a 10−3 level due to their direct impact on the initial state distribution of the investigated β decay. In order to obtain a complete model of the molecular processes in the sample various spectroscopic measurements of mixtures with non-radioactive isotopologues (H2, HD, D2) have been using IR spectroscopy in the liquid at temperatures <25 K and Raman spectroscopy in the gaseous phase at room temperature. This poster presents an overview of recent and current investigations with TApIR: The investigation of dimer and cluster formation under KATRIN conditions, as well as the ongoing task to investigate mixtures beyond the thermal equilibrium with highly concentrated HD and the design of a tritium compatible system for temperatures between (15−293) K.