Bonn 2010 – wissenschaftliches Programm
HK 36.32: Poster
Mittwoch, 17. März 2010, 14:00–16:00, HG Aula
Deconvolution method for determination of the KATRIN energy loss function — Volker Hannen1, •Christopher Kranz1, Anna Sejersen Riis1,2, and Christian Weinheimer1 — 1Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Germany — 2Department of Physics and Astronomy, Aarhus University, Denmark
The KATRIN experimental sensitivity to the neutrino mass depends heavily on the proper reduction of systematic errors, one of which stems from incomplete knowledge of the so-called energy loss function.
As the electrons created by tritium beta decay move through the tritium source they may undergo scattering on T2 molecules and, as a consequence, loose energy and change their direction of motion. This process is described by the energy loss function.
Using singular value decomposition methods the energy loss function can be deconvoluted from measurements of the KATRIN response function at different Tritium densities using a monoenergetic electron gun. From simulated data we determined a systematic error due to the remaining uncertainties in the deconvoluted energy loss function of Δ m2 ≈ 0.007 eV2. This exactly satisfies the KATRIN design report requirements.
A more systematic investigation is currently underway, to optimize the measurement procedure for the experimental determination of the energy loss function.
This work is supported by BMBF under contract number 05A08PM1.