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Reconstruction of high-energy neutrino-induced showers in KM3NeT

Zijlstra, G. (2011) Reconstruction of high-energy neutrino-induced showers in KM3NeT. Bachelor's Thesis, Physics.

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To study the origin of Cosmic Rays, a new large-volume neutrino telescope (KM3NeT) will be built. Neutrinos can be detected through their interactions with matter, creating relativistic secondary particles. In water, these secondary particles will emit Cherenkov light, which can be measured by KM3NeT through detection lines with Multi-PMT Optical Modules. Initially, KM3NeT has been designed to detect muon tracks, but in this work the extension of KM3NeT for showers has been demonstrated. The performance of KM3NeT and Antares has been tested by simulating electron-neutrino-induced hadronic showers and muon-neutrino-induced hadronic showers using AMHiC and AGeMOM simulating tools. The AMHiC simulating tool has been compared to a standard tool for Antares simulations and was found to be working well for Antares. Thereafter, AMHiC had been adjusted to aAMHiC for simulations in KM3NeT. In parallel, simulations in KM3NeT have been done with the existing AGeMOM tool. The aAMHiC tool was found to give the best results, as its simulations gave the best accuracy in determining the spacetime coordinates of the shower interaction vertex. As the last step, a new reconstruction strategy had been applied on simulations of electron-neutrino-induced hadronic showers and muon-neutrino-induced muons. With the ability to reconstruct showers, the next challenge was to distinguish the showers from the huge atmospheric muon background. A quality cut, developed for Antares, can be applied in order to distinguish shower events from muons. This has been demonstrated for simulations with aAMHiC, showing that this newly developed tool can be used for shower selection in KM3NeT. The simulation methods aAMhiC and AGeMOM have produced showers in KM3NeT which can be reconstructed with a new selection strategy in order to distinguish shower events from muons with high efficiency and purity.

Item Type: Thesis (Bachelor's Thesis)
Degree programme: Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 15 Feb 2018 07:55
Last Modified: 15 Feb 2018 07:55

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