Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Postersitzung

HK 36.32: Poster

Mittwoch, 17. März 2010, 14:00–16:00, HG Aula

Deconvolution method for determination of the KATRIN energy loss functionVolker Hannen1, •Christopher Kranz1, Anna Sejersen Riis1,2, and Christian Weinheimer11Institut 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.

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