Würzburg 2018 – scientific programme

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T: Fachverband Teilchenphysik

T 52: Suche nach dunkler Materie III

T 52.7: Talk

Wednesday, March 21, 2018, 18:10–18:25, Philo-HS5

Particle Identification via Liquid Argon-Xenon Scintillation — •Andreas Himpsl¹, Walter Potzel¹, Stefan Schönert¹, Marcel Toulemonde², Andreas Ulrich¹, and Jochen Wieser³ — ¹Technische Universität München, Physik Department E15, James-Franck-Str., 85748 Garching, Germany — ²CIMAP-GANIL, Bd. Henri Becquerel BP5133 14070 Caen cedex 5, France — ³Excitech GmbH, Branterei 33, 26419 Schortens, Germany

Two well separated scintillation light emission peaks are observed in liquid argon with a 10ppm xenon admixture: The VUV emission of the xenon excimer at 174nm, and a NIR emission with a center wavelength of 1173nm, attributed to a transition between a Wannier Mott exciton and the first excited level in xenon (A. Neumeier EPL109, 12001, 2015). The goal of this study was to test potential particle identification by measuring the NIR-to-VUV intensity ratio. Various ions from the Munich Tandem accelerator exciting the liquid with energies between 0.3 and 20 MeV/u were used for that purpose. It was found that the NIR/VUV intensity ratio depends on the projectile species and its energy. Furthermore, for detector physics, energy deposition per unit volume is important, not only linear energy transfer (LET). Superheating and boiling conditions have to be considered in the center of some of the heavy ion tracks. To explain the results the transition from LET to energy deposition per atom will be discussed.

This work was supported by the DFG Excellenzcluster Origin and Structure of the Universe and the Maier-Leibnitz-Laboratorium (Garching).