In this work, for the first time, all three neutrino flavours and all interactions channels are exploited in a search for cosmic neutrino sources. As a first step, a reconstruction algorithm for electromagnetic and hadronic shower events was developed (chapter 5). Later, these shower events were combined with muon candidates from an already existing muon track reconstruction. On this superset of events, searches for significant clustering were performed (chapter 7). A detection of such a cluster would be a hint for a cosmic neutrino source. In the end, stringent limits for point-like and extended sources could be set (chapter 8).
The successor of the ANTARES detector is called KM3NeT and is currently under construction on two different sites in the deep Mediterranean Sea. It will encompass several cubic kilometres of instrumented volume and consist of thousands of optical modules; each housing not one large but 31 small photomultiplier tubes. A first prototype of this multi-PMT optical module has been deployed within ANTARES. The results from the calibration and analysis of this prototype are presented here as well (chapter 4).
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