Identification of acoustic neutrino signals of astrophysical origin in underwater detectors

Identification of acoustic neutrino signals of astrophysical origin in underwater detectors

URI: https://www.openarchives.gr/aggregator-openarchives/edm/ntua/000011-123456789_59094
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National Technical University of Athens

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Title

Ανίχνευση ακουστικών σημάτων νετρίνων αστροφυσικής προέλευσης με υποβρύχιους ανιχνευτές (EL)

Identification of acoustic neutrino signals of astrophysical origin in underwater detectors (EN)

Creator

Πάσχος, Κωνσταντίνος (EL)

Paschos, Konstantinos (EN)

Contributor

Ρούνη, Παναγιώτα (EL)

ntua (EL)

Αναγνωστάκης, Μάριος (EL)

Πετρόπουλος, Νικόλαος (EL)

Type

bachelorThesis

Thesis
Bachelor thesis (EN)

Issued

2024-04-04T08:29:02Z

2023-10-27

Year

2023 (EN)

Description

The neutrino is a very special elementary particle. It gathers the attention of scientists with a broad spectrum of expertise. Particle physicists expect neutrinos to reveal new physics beyond the Standard Model, while astroparticle physicists utilize them as a powerful messenger, sometimes more credible than photons, able to shed light on yet unknown phenomena in our universe. Neutrino telescopes detect Cherenkov radiation emerging from neutrino interactions inside the detector volume in order to reconstruct the particle’s direction and energy up to the scale of PeV. When it comes to the ultra-high-energy region, above 100 PeV, Cherenkov detectors are not a viable solution, as their geometry should exceed both technological and financial limits in order to keep up with the challenges of a very small cosmic neutrino flux and a very broad Cherenkov cone of light. Acoustic neutrino detection is a promising technique that aims to observe ultra-high-energy neutrinos by exploiting the pressure disorder propagated in water due to the rapid and dense energy deposited from the neutrino interactions that take place inside the medium. This thesis develops the thermoacoustic model that describes the sound propagation after the energy deposition and presents a numerical scheme for the calculation of the resulting pressure field, as well as an overall framework for simulating neutrino-induced acoustic pulses. Subsequently, it develops a method for locating them among real sound data acquired at sea, both with and without the use of machine learning techniques. The work concludes with the discussion of implementing such classification techniques into an acoustic detector configuration aimed at working as a neutrino telescope in the ultra-high-energy window. (EN)

Scientific field

Engineering and Technology ▶ Mechanical Engineering
Nuclear Energy and Engineering (EN)

Subject

Νετρίνο (EL)

Θερμοακουστικό μοντέλο (EL)

Μετασχηματισμός wavelet (EL)

Neutrino (EL)

Κοσμική ακτινοβολία (EL)

Ακουστική ανίχνευση (EL)

Wavelet transform (EN)

Thermoacoustic model (EN)

Ultra high energy cosmic rays (EN)