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T: Fachverband Teilchenphysik

T 99: Kosmische Strahlung 1

T 99.5: Vortrag

Montag, 27. Februar 2012, 17:50–18:05, ZHG 006

A composition study of ultra high energy cosmic rays using timing information from the 750m infill array of the Pierre Auger Observatory — •Roman Hiller and Markus Roth — KIT Karlsruhe, Institut für Kernphysik

The Pierre Auger Observatory is a hybrid detector for the purpose of detecting extensive air showers from ultra high energy cosmic rays (UHECR). It consists of an array of water cherenkov detectors, the surface detector (SD), and atmospheric fluorescence telescopes, the fluorescence detector. The determination of the mass composition of UHECR is one of its main tasks and may give important hints on their sources and accelerators. One approach to deduce it from data of the SD is to use the risetime, the time it takes for the integrated signal of a surface detector station to rise from 10% to 50% of its final value. For the 750m infill array, that was commissioned in 2008 as a part of the AMIGA extension and makes energies below 1 EeV accessible to the SD, risetime studies have yet to be performed. To use risetime for the determination of mass composition one has to condense the information of the stations from a single event to one mass sensitive observable that can be compared with simulations. Therefore risetime has to be corrected for azimuthal asymmetry, furthermore its dependance on the distance to the shower core and zenith angle has to be taken into account. Details on the implementation and the results are shown.