Journal
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
Volume 136, Issue -, Pages 18-27Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysbps.2004.10.045
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We completed a successful 14-year observation of the Akeno Giant Air Shower Array (AGASA). We observed about 1000 extremely highest energy cosmic rays (EHECRs) above 10(19) eV including eleven events above 10(20) eV. The AGASA data indicate that the cosmic ray spectrum extends well beyond the predicted GreiseD-Zatsepin-Kuz'min cutoff. In the arrival direction distribution of EHECRs, clusters of events are found which suggest the presence of the extragalactic EHECR point sources. The composition of EHECRs is consistent with light hadrons around 10(19) eV, and no gamma-ray dominance has been observed.
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