Study of the KM3NeT/ARCA Neutrino Telescope first data and study of the diffuse astrophysical neutrino flux

• Main Authors: Sinopoulou, Anna, Σινοπούλου, Άννα
• Format: Doctoral or Postdoctoral Thesis
• Language: English
• Published: National Technical University of Athens (NTUA) 2022
• Subjects: Νετρίνα; Αστροφυσικά νετρίνα; υπερκαινοφανή νετρίνα; νετρίνα β-δέσμης; Monte Carlo προσομοίωση; Υποθαλάσσιο τηλεσκόπιο νετρίνων KM3NeT; Ανάλυση δεδομένων; Neutrinos; Astrophysical neutrinos; supernova neutrinos; beta-beam neutrinos; Monte Carlo simulations; Underwater neutrino telescope KM3NeT; Data analysis; Φυσική; Φυσικές Επιστήμες; Αστρονομία και Αστροφυσική; Σωματιδιακή φυσική και Φυσική πεδίων; Physical Sciences; Natural Sciences; Astronomy and Astrophysics; Particles and fields physics; Orca
• Online Access: http://hdl.handle.net/10442/hedi/53243; https://doi.org/10.12681/eadd/53243

The Universe has always been of interest for humans and its mysteries still fascinate us. Several mechanisms are still to be understood; the acceleration of high-energetic cosmic rays belongs to the fundamental open questions of modern physics. In order to fully understand and investigate the Universe it is needed to explore different cosmic messengers in addition to photons, which have been used for thousands of years. Photons may be absorbed by the interstellar medium and cosmic magnetic fields distort the trajectory of charged particles, a fact which imposes limitations to our observations using these messengers. A new era in astronomy has begun the last years with the discovery of gravitational waves and the discoveries from neutrino telescopes. Gravitational waves have already pointed to extremely energetic events of the Universe such as the merging of neutron stars. Neutrinos from astrophysical sources have already been detected; for example neutrino emission from the direction of the blazar TXS-0506+056 with the IceCube neutrino telescope. Neutrinos, being neutral and weakly interacting with matter, are considered the ideal cosmic messengers as they can point to high-energetic cosmic ray sources and unveil several of the Universe mysteries.The KM3NeT collaboration works on the infrastructure that hosts the future neutrino detectors in the Mediterranean Sea; the ORCA and ARCA detector. ORCA will be used for investigation of the neutrino properties, while ARCA will be used as a neutrino telescope to observe high energetic astrophysical phenomena. At the time of writing, ARCA is being constructed and data are being collected with the currently operating deployed detection units. This thesis will focus on analysing the data collected aiming at showing that ARCA with ∼ 1−5% of its full instrumented volume is able to successfully reject the atmospheric muon background, detect neutrino candidate events and to perform an analysis on the detector sensitivity to the diffuse astrophysical neutrino flux. The first ...