Freiburg 2008 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 84: Kosmische Strahlung IV

T 84.1: Gruppenbericht

Donnerstag, 6. März 2008, 16:45–17:05, KGI-HS 1199

Lateral distribution, momentum spectrum and charge ratio of cosmic ray muons at a depth of 320 m.w.e. underground — •Michael Schmelling¹, Claus Grupen², Nadir Omar Hashim^1,2, Steffen Luitz³, Florin Maciuc², Arif Mailov², Anke-Susanne Mueller⁴, Alois Putzer⁵, Bertram Rensch⁶, Heinz-Georg Sander⁷, Sascha Schmeling⁸, Rodica Tcaciuc², Horst Wachsmuth⁸, Thomas Ziegler⁹, and Kai Zuber¹⁰ — ¹MPI for Nuclear Physics — ²Uni Siegen — ³SLAC — ⁴Forschungszentrum Karlsruhe — ⁵Uni Heidelberg — ⁶erphi Electronics — ⁷Uni Mainz — ⁸CERN — ⁹Princeton — ¹⁰Uni Dortmund

The CosmoALEPH experiment at CERN has studied cosmic ray muons at a depth of 320 m.w.e. underground. The momentum spectrum up to energies of 3 TeV was measured with the ALEPH Time Projection Chamber. The lateral distribution was determined from coincidence rates between the ALEPH hadron calorimeter and scintillator stations located in the cavern and the LEP tunnel up to distances of 1 km. Final results are presented for the momentum spectrum and the charge ratio of vertical muons extrapolated to the surface, and for the underground lateral distribution in the form of a decoherence curve, which is sensitive to the chemical composition of primary cosmic rays. The data are compared to Monte Carlo simulations and measurements by other experiments.