Observation of the GZK Cutoff Using the HiRes Detector

Details Observation of the GZK Cutoff Using the HiRes Detector Observation of the GZK Cutoff Using the HiRes Detector

2006-09-15

arxiv.org/abs/astro-ph/0609453v1

Nucl.Phys.Proc.Suppl.165:19-26,2007

Astronomy and Astrophysics

Astrophysics

8 pages, 12 figures. Proceedings submission for CRIS 2006, Catania, May/June 2006

Scientific paper

10.1016/j.nuclphysbps.2006.11.00

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 $4\times10^{18}$ eV and a high energy suppression at $6\times10^{19}$ 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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