In this paper we review the extragalactic propagation of ultrahigh energy cosmic-ray
(UHECR). We present the different energy loss processes of protons and nuclei, and their …

Observations of ultrahigh energy cosmic rays (UHECR) do not uniquely determine both the
injection spectrum and the evolution model for UHECR sources—primarily because …

We study the production of cosmogenic neutrinos and photons during the extragalactic
propagation of ultra-high-energy cosmic rays (UHECRs). For a wide range of models in …

The origin of ultrahigh energy cosmic rays (UHECR) is still unknown. However, great
progress has been achieved in past years due to the good quality and large statistics in …

We develop a model for explaining the data of Pierre Auger Observatory (Auger) for ultra
high energy cosmic rays (UHECR), in particular, the mass composition being steadily …

We argue that an astrophysical solution to the ultrahigh energy cosmic ray (UHECR)
problem is viable. The detailed study of UHECR energy spectra is performed. The spectral …

Ultrahigh-energy cosmic rays (UHECRs) are atomic nuclei from space with vastly higher
energies than any other particles ever observed. Their origin and chemical composition …

Recent results from the Pierre Auger Observatory, showing energy-dependent chemical
composition of ultrahigh-energy cosmic rays (UHECRs) with a growing fraction of heavy …

Ultra-High-Energy Cosmic-Ray (UHECR) astronomy in the next decade aims to answer the
questions: What is the nature and origin of UHECRs? How are UHECRs accelerated to such …

The Pierre Auger Observatory's (PAO) shower profile measurements can be used to
constrain the chemical composition of the ultra-high energy cosmic ray (UHECR) spectrum …