Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 55: Suche nach Dunkler Materie 2 (Direkter Nachweis)

T 55.6: Talk

Tuesday, March 28, 2017, 18:10–18:25, VSH 19

Particle Identification via Liquid Argon-Xenon Scintillation — •Andreas Himpsl¹, Thomas Dandl¹, Stefan Schönert¹, Andreas Ulrich¹, and Jochen Wieser² — ¹Physik Department E15, Technische Universität München — ²Excitech GmbH, Branterei 33, 26419 Schortens, Germany

Intense infrared scintillation light with a center wavelength of 1173nm was found in liquid argon with a 10ppm xenon admixture (A. Neumeier EPL 109, 12001, 2015). The admixture also shifts the well known 130nm scintillation of argon to the corresponding xenon emission at 175nm. We present the results of a study in which we compare the intensity of the two emission bands (VUV and NIR) for excitation by different projectiles. Low energy (10keV) electrons and various ions such as carbon, sulfur, and iodine with energies of several MeV/u are used for that purpose. The scintillation light is detected with two phototubes with selective sensitivity in the VUV and NIR, respectively. The goal is to test whether the emission bands can be used for purely optical particle identification in liquid argon detectors with a xenon admixture. This work was supported by the DFG Excellenzcluster Origin and Structure of the Universe and the Maier-Leibnitz-Laboratorium Garching.