The possible feature of the energy spectrum of the primary cosmic rays at ultra-high energies

TL;DR

This paper estimates the energies of the most energetic cosmic ray air showers at Yakutsk using all detector data, revealing energies up to 200 EeV and analyzing their composition based on different nuclei.

Contribution

It introduces a method to estimate cosmic ray energies without the standard s(600) parameter, providing new insights into ultra-high-energy cosmic ray spectra.

Findings

Maximum energy of 200 EeV observed for some showers

Energy estimates vary with primary particle type

Supports the presence of ultra-high-energy cosmic rays

Abstract

The energies of the most energetic extensive air showers observed at the Yakutsk array have been estimated with help of the all detectors readings instead of using of the standard procedure with a parameter s(600). The energy of the most energetic extensive air shower observed at the Yakutsk array happened to be 200, 200, 180 and 165 EeV with the values of the Xi**2 function per one degree of freedom 0.9, 1., 0.9 and 1.1 for the primary protons and helium, oxygen and iron nuclei accordingly.