Göttingen 2012 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 116: Experimentelle Techniken der Astroteilchenphysik 4

T 116.2: Vortrag

Donnerstag, 1. März 2012, 17:05–17:20, VG 0.110

Attenuation length measurements of liquid Argon — •Alexander Neumeier1, Thomas Dandl1, Thomas Heindl1, Martin Hofmann1, Lothar Oberauer1, Walter Potzel1, Stefan Schönert1, Jochen Wieser2, and Andreas Ulrich11TU München — 2Optimare GmbH Wilhelmshaven

In the recent years liquified rare gases have been proven to be good detector media for particle physics, e.g. for the search for Dark Matter or the neutrinoless double β-decay. These detectors most often use the UV scintillation light emitted by the rare gas being excited or ionized by a traversing charged particle. One important key point to fully understand the detector response is the determination of the attenuation length of the liquid rare gas at the wavelength of its scintillation light. In this talk a table-top setup for the measurement of these attenuation lengths is presented, which uses a deuterium arc lamp as light source in the VUV and UV range and a monochromator with an intensified diode array detector as read-out system. The liquified rare gas is contained in a target cell with MgF2-windows and condensed, re-evaporated and cleaned in a continuous mode. The results of the spectrally resolved measurements with liquid Argon with two different cell lengths (58 mm and 116 mm) will be shown and discussed. The influence of gas impurities has been studied, too, showing that even small concentrations of water and Xenon in the liquid Argon can severly deteriorate the light transmission.

This work has been supported by founds of the Maier-Leibnitz-Laboratorium Garching.

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