期刊
NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS
卷 165, 期 -, 页码 19-26出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nuclphysbps.2006.11.004
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The High Resolution Fly's Eye (HiRes) experiment has observed the GZK cutoff. HiRes observes two features in the ultra-high energy cosmic ray (UHECR) flux spectrum: the Ankle at an energy of 4 x 10(18) eV and a high energy suppression at, 6 x 10(19) eV. The later feature is at exactly the right energy for the GZK cutoff according to the E-1/2 criterion. HiRes cannot claim to observe a third feature at lower energies, the Second Knee. The HiRes monocular spectra are presented, along with data demonstrating our control and understanding of systematic uncertainties affecting the energy and flux measurements.
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