Abstract Ultra-high-energy (UHE) cosmic rays (CRs) of energies ∼(10 18 –10 20 ) eV, accelerated in violent astrophysical environments, interact with background radiation fields via photo-hadronic processes, leading to strong attenuation. Typically, the Universe would become “opaque” UHE CRs after several tens megaparsecs, setting boundary Greisen–Zatsepin–Kuz’min (GZK) horizon. In this work, we...

We discuss some aspects of the propagation of high-energy cosmic rays (CRs) in turbulent magnetic fields, and propose a formula for the diffusion coefficient based on accurate simulations in a wide energy range. We discuss the transition between ballistic and diffusive regimes and the magnetic horizon of CR sources, showing how magnetic fields of a few nG could modify the shape of the GZK featu...

We propose a scenario in which a simple power-like primary spectrum for protons with sources at cosmological distances leads to a quantitative description of all the details of the observed cosmic ray spectrum for energies from 10 17 eV to 10 21 eV. As usual, the ultrahigh energy protons with energies above E GZK ≈ 4 · 10 19 eV loose a large fraction of their energies by the photoproduction of ...

We developed a numerical simulation of the propagation of UHECR in the Cosmic Microwave Background (CMB) and we used it to determine the significance of the GZK feature in the spectrum of UHECR measured by AGASA and HiRes. We find that these two experiments are best fit by two different injection spectra in the region below 10 eV and that the error bars around the GZK feature are dominated by f...

The discoveries of the GZK cutoff with the HiRes and Auger Observatories and the discovery by Auger of clustering of > ∼ 60 EeV ultra-high energy cosmic rays (UHECRs) towards nearby ( < ∼ 75 Mpc) AGNs along the supergalactic plane establishes the astrophysical origin of the UHECRs. The likely sources of the UHECRs are gamma-ray bursts and radio-loud AGNs because: (1) they are extragalactic; (2)...

Relic neutrino νr light masses clustering in Galactic and Local Hot Dark Halos act as a beam dump calorimeter. Ultra High Energy ν, above ZeV, born by AGNs,GRBs at cosmic edges, overcoming the Greisen, Zatsepin, Kuzmin (GZK) cut-off, may hit near Z resonance and WW-ZZ channels energies: their showering into nucleons and γ Ultra High Cosmic Ray (UHECR) fit observed data. Any tiny neutrino mass s...

The energy losses and spectra of Ultra High Energy Cosmic Rays (UHECR) are calculated for protons as primary particles. The attention is given to the energy losses due to electron-positron production in collisions with the microwave 2.73 K photons. The energy spectra are calculated for several models, which differ by production spectra and by source distribution, namely: (i) Uniform distributio...

Object of research - disturbed lands Ingulets Iron Ore dressing Work (Ingulets GZK) The purpose work development and substantiation technology realization principles cascade waste use. Research methods – field experiment, comparative analysis, systems analysis. As part the implementation use principle, results on impact application sewage sludge formation protosoils rocks GZK dumps are presente...