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T: Fachverband Teilchenphysik

T 20: Neutrinophysik I

T 20.2: Talk

Monday, March 19, 2018, 16:20–16:35, Z6 - SR 2.012

Investigation on the electron drift at the edges of the EXO-200 TPC — •Sebastian Schmidt, Gerrit Wrede, Tobias Ziegler, Jürgen Hößl, Gisela Anton, and Thilo Michel — Erlangen Centre for Astroparticle Physics (ECAP), Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen

The EXO-200 experiment searches for the neutrinoless double beta decay (0νββ) of ¹³⁶Xe using a TPC filled with enriched liquid xenon. An event taking place within the detector leads to the ionization and excitation of Xe-atoms. The created electrons are drifting in an electric field until they either recombine with a Xe-ion or reach the charge detection unit of the system. Deexcitation, as well as recombination, causes the emission of scintillation light which is also detected. This information is combined in order to estimate the energies as well as the positions of the interactions of a primary particle.
In this contribution, the analysis of non-uniformities of the electric field close to the edges of the EXO-200 TPC is presented. This involves the investigation of the standoff distance, describing the shortest distance of a reconstructed interaction vertex to the inner boundary of the TPC. By using charge drift simulations in combination with optimization methods, an improvement of the agreement of MC and data is achieved.