Extensive air showers of cosmic rays with energies above 5.10**18 eV registered by the Yakutsk array have been analyzed. The existence of showers without muon component is found. Among them we found 5 clusters and these clusters correlate with nearest pulsars. It is found that there exist 4 classes of showers. Showers with high content of muons are mainly observed at E> 4.10**19 eV and they are formed most likely by heavy nuclei.
@article{arxiv.astro-ph/0507680,
title = {Extensive air showers without muon component},
author = {A. A. Mikhailov and N. N. Efremov and E. S. Nikiforova},
journal= {arXiv preprint arXiv:astro-ph/0507680},
year = {2007}
}
Comments
4 pages, 2 figures, the paper will be publish in Proc. ICRC, Pune, India, 2005