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Das Spektrum der kosmischen Elektronen gemessen mit H.E.S.S.


Egberts,  Kathrin
Division Prof. Dr. Werner Hofmann, MPI for Nuclear Physics, Max Planck Society;

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Egberts, K. (2005). Das Spektrum der kosmischen Elektronen gemessen mit H.E.S.S. Diploma Thesis, Ruprecht-Karls Universität, Fakultät für Physik und Astronomie, Heidelberg.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-8800-9
This work presents a new method for gamma-hadron separation for the H.E.S.S. experiment and its application to the analysis of cosmic ray electrons. "Random Forest" is a classification algorithm. It demonstrates good separation power and agreement with the H.E.S.S. standard analysis. Because of the small differences between the air shower images of gammas and electrons it can be used for the analysis of cosmic ray electrons. The proof for being electrons is done by analysing the height of the interaction maximum. The main result of this work is the energy spectrum of the cosmic ray electrons. It has low statistical but big systematic errors. The systematic errors are due to the background estimation based on Monte Carlo simulations. The spectrum is compatible with previous measurements, it has a spectral index of 3.6 +- 0.1 and a flux at 1 TeV of 62+-16 GeV2m-2s-1sr-1. At energies higher than 1 TeV there is some indication for an excess in the shape of the spectrum. This excess can be interpreted as contribution of local sources.