Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 72: Postersitzung Teilchenphysik

T 72.12: Poster

Tuesday, March 28, 2017, 16:45–19:00, F Foyer

Investigation on position reconstruction at the edges of the EXO-200 TPC — •Sebastian Schmidt, Gerrit Wrede, Gisela Anton, Jürgen Hößl, and Thilo Michel — Erlangen Centre for Astroparticle Physics (ECAP), Friedrich-Alexander-Universität Erlangen-Nürnberg, Erwin-Rommel-Str. 1, 91058 Erlangen

EXO-200 is an experiment searching for the neutrinoless double beta decay of Xe-136 using a TPC filled with enriched liquid xenon.

Events taking place in the bulk liquid lead to the emergence of scintillation light with a wavelength in the vacuum ultraviolet band and free charge in the form of electrons. The light and charge signals are used to determine the energy of an event. The position is reconstructed with the charge signal only.

A larger mass of the fiducial volume increases the sensitivity of the experiment. To improve this, further investigations of effects close to the border of the TPC are made in order to include events in this region and to extend the active volume as a consequence.

In this contribution we present our analysis of the standoff distance distribution - the shortest distance of an event vertex to the inner boundary of the TPC - for Monte Carlo data and compare the results to real data.

Additionally, a drift simulation of electrons in the TPC is used to get a better agreement of Monte Carlo and data taken by the experiment in order to eventually improve the detector sensitivity.