Acoustic sensor development for ultra high energy neutrino detection

TL;DR

This paper discusses the development of acoustic sensors aimed at detecting ultra high energy neutrinos, emphasizing the potential of acoustic techniques for large-volume detection due to their long attenuation lengths.

Contribution

It reports on current acoustic R&D activities, sensor sensitivities, triangulation capabilities, and requirements for building a full-scale neutrino detector.

Findings

Achieved specific sensitivities in acoustic detection

Demonstrated triangulation capabilities for source localization

Outlined requirements for a large-scale detector

Abstract

The GZK neutrino flux characterization would give insights into cosmological source evolution, source spectra and composition at injection from the partial recovery of the degraded information carried by the ultra high energy cosmic rays. The flux is expected to be at levels necessitating a much larger instrumented volume ($>$100 km$^3$) than those currently operating. First suggested by Askaryan, both radio and acoustic detection techniques could render this quest possible thanks to longer wave attenuation lengths (predicted to exceed a kilometer) allowing for a much sparser instrumentation compared to optical detection technique. We present the current acoustic R&D activities at our lab developing adapted devices, report on the obtained sensitivies and triangulation capabilities we obtained, and define some of the requirements for the construction of a full scale detector.