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νSpaceSim: An end-to-end simulation package to model the sensitivity of UHECR experiments to upward-moving extensive air showers sourced by cosmic neutrinos interacting in the Earth
Conference proceeding   Open access   Peer reviewed

νSpaceSim: An end-to-end simulation package to model the sensitivity of UHECR experiments to upward-moving extensive air showers sourced by cosmic neutrinos interacting in the Earth

Jorge Caraça Valente Barrera, John Krizmanic, Yosui Akaike, Luis Anchordoqui, Douglas Bergman, Isaac Buckland, Jorge Caraça-Valente, Austin Cummings, Johannes Eser, Fred Angelo Batan Garcia, …
Pos : proceedings of science, Vol.484, 074
04/29/2025
DOI: 10.22323/1.484.0074
url
https://doi.org/10.22323/1.484.0074View
Published (Version of record) Open Access

Abstract

Neutrinos act as probes of hadronic processes and offer a distinctive view into their astrophysical origins at high energies. When reaching energies on the PeV scale, ντ interactions within the Earth can produce a significant flux of τ-leptons. These τ-leptons subsequently decay, generating upward-moving extensive air showers (EAS). Using the Earth as a target for neutrinos and the atmosphere as a signal generator effectively creates a detector with a mass ≫ gigaton. νSpaceSim is a comprehensive simulation developed to model all the relevant physical processes that describe the neutrino-induced, Earth-emergent lepton chain. The simulation models neutrino interactions inside the Earth that produce leptons, the propagation of the leptons through the Earth into the atmosphere, and their decay, forming composite EAS. Next, it models the generation of air optical Cherenkov and radio signals from these showers, including the propagation and attenuation of these signals through the atmosphere, accounting for effects such as clouds and the ionosphere. Finally, the simulation models the detector response according to the parameters defined by the user (such as altitude, effective area, frequency band...). Through this end-to-end simulation, νSpaceSim aims to help design the next generation of balloon- and space-based experiments, to estimate the exposure of ground-based experiments to these showers, and to understand the data from recent experiments such as EUSO-SPB2 and ANITA.

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