Mainz 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 105: Experimentelle Methoden der Astroteilchenphysik 4
T 105.2: Vortrag
Donnerstag, 27. März 2014, 17:00–17:15, P7
Studies of the reflectivity properties of teflon for VUV light in liquid xenon — •Cecilia Levy, Karen Bokeloh, Ethan Brown, Christian Huhmann, Stephan Rosendahl, and Christian Weinheimer — Institut fuer Kernphysik, Wilhelm-Klemm Str 9, 48149 Muenster
Ordinary matter makes up only 5% of the universe as we know it. Out of the remaining 95%, 25% are composed of a new type of matter called dark matter. By looking for the interaction of dark matter particles with liquid xenon and the resulting scintillation, the XENON project attempts to discover dark matter in the form of Weakly Interacting Massive Particles (WIMPs). The current experiment XENON100 has achieved a sensitivity of σ < 2.0 * 10−45 cm2 to the WIMP-nucleon cross section. The experiment now in its next phase, XENON1T, will increase this sensitivity by two orders of magnitude. In order to have a high scintillation collection to detect the low energy recoils of dark matter interactions, a teflon reflector is used, whose reflection properties need to be better understood. For this purpose, a deuterium lamp has been set up, which shines 178 nm light on a teflon sample contained in a VUV transparent quartz tube filled with liquid xenon. The reflected light is then viewed by a movable PMT. This setup allows to measure the specular and diffuse reflectivity of teflon at varying angles of incidence and reflection, allowing for a full model of the reflection process in liquid xenon. Results of these measurements will be discussed. The project is supported by DFG and Helmholtz Allianz for Astroparticle Physics HAP.