文章基本信息

标题：Recent Results from the HiRes Experiment
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作者：A. Zech
期刊名称：PoS - Proceedings of Science
印刷版ISSN：1824-8039
出版年度：2005
卷号：2005
出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The High Resolution Fly’s Eye (HiRes) collaboration has measured the spectrum of ultra-high energy cosmic rays (UHECR) in the energy range from 1017.2 to 1020.2 eV with two air fluorescence detectors. Two spectral features have been found: The “ankle” is clearly seen at about 1018.5 eV. We have also evidence for a suppression of the cosmic ray flux at an energy of about 1019.8 eV, where the GZK effect is expected to become apparent in the spectrum. The composition of cosmic rays has been measured between 1018.0 and 1019.4 eV using the Xmax method. A measurement of the proton-air inelastic cross section has been made. We have also searched for anisotropy in the arrival directions of ultra-high energy cosmic rays. Our latest results on these topics will be presented.