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O: Fachverband Oberflächenphysik
O 18: Poster Session II: Metal substrates II
O 18.7: Poster
Monday, March 1, 2021, 13:30–15:30, P
Tritium adsorption on a gold surface from a gaseous tritium source — Max Aker and •Frank Hermann — Institute for Astroparticle Physics and Institute of Experimental Particle Physics, Karlsruhe Institute of Technology
The KATRIN collaboration aims to determine the neutrino mass with a sensitivity of 0.2 eV/c2 (90 % CL). This will be achieved by measuring the endpoint region of the β-electron spectrum of gaseous tritium. A gold-coated stainless steel disk defines the physical limit of the tritium source. This so-called rear wall and any potential adlayer on it are exposed to impinging β-electrons, tritium cluster ions and neutral tritium molecules which allows ad- and absorbing tritium.
The beta-spectrum from tritium decays on or below the rear wall surface differs from that of the gaseous tritium source. This leads to a spectral distortion which needs to be considered in the neutrino mass determination. Investigations with regard to spectral shape, radial distribution and temporal evolution will be presented in this poster. Also first models predicting its future increase and hypotheses for the state of the surface-near bound tritium will be discussed.
This work is supported by the Helmholtz Association (HGF), the Ministry for Education and Research BMBF (05A17PM3, 05A17PX3, 05A17VK2, and 05A17WO3), the Helmholtz Alliance for Astroparticle Physics (HAP), and the Helmholtz Young Investigator Group (VH-NG-1055).