Coherent and random UHECR Spectroscopy of Lightest Nuclei along CenA: Shadows on GZK Tau Neutrinos spread in a near sky and time

TL;DR

This paper discusses how light nuclei like helium dominate ultra-high-energy cosmic rays from CenA, their propagation effects, and the potential for detecting associated neutrino and tau air-shower signals in current observatories.

Contribution

It introduces a detailed model of UHECR propagation involving light nuclei and predicts observable neutrino and tau air-shower signatures at PeV energies.

Findings

CenA is confirmed as a main nearby UHECR source.

Light nuclei like He dominate the UHECR composition.

Predicted neutrino and tau air-shower signals at tens to hundreds of PeV.

Abstract

Earliest 2007 UHECR anisotropy findings and ICRC AUGER updated maps and clustering confirms our understanding of CenA as the main nearby UHECR source. Those events are mostly lightest nuclei, as He. The events are spread by galactic fields. We argue that the main UHECR event bending, along CenA, is spreading vertically (respect to horizontal spiral galactic fields) by random (and a final coherent) Lorentz force. The He-nuclei dominance is also well probed by detailed AUGER composition data. The Lightest nuclei are still compatible with most recent Hires composition results. Such lightest UHECR nuclei are fragile and opaque even to nearest Universe. Offering a very narrow local (ten Mpc) view. This opacity explain the otherwise puzzling Virgo persistent absence. The He photo-disruption in flight should lead to halves energy tail clustering (along the same CenA group), events made by deuterium, He3 and protons (or unstable neutrons). This tail anisotropy should be revaled. The consequent foreseen UHE neutrino by UHECR Lightest nuclei dissociation, at tens-a hundred PeV, may rise soon in AUGER and TA telescopes. Such neutrino signal are quite inclined upward fluorescent Tau air-showers at nearest (2 - 4 km) horizons, at middle-low telescope view zenith angles. Their air-showers will be opening and extending in widest azimuth angle and fastest angular velocity spread. Contrary to far EeV tau expected by popular GZK neutrinos. Even hard to observe these Tau Air-showers at tens and hundred PeVs may soon shine (in a peculiar way) at near telescope views and within a short (years) time, both in AUGER, HEAT and TA sky.