First Observation of the Greisen-Zatsepin-Kuzmin Suppression

Details First Observation of the Greisen-Zatsepin-Kuzmin Suppression First Observation of the Greisen-Zatsepin-Kuzmin Suppression

2007-03-06

arxiv.org/abs/astro-ph/0703099v2

Phys.Rev.Lett.100:101101,2008

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, accepted by and to appear in PRL

Scientific paper

10.1103/PhysRevLett.100.101101

The High Resolution Fly's Eye (HiRes) experiment has observed the Greisen-Zatsepin-Kuzmin suppression (called the GZK cutoff) with a statistical significance of five standard deviations. HiRes' measurement of the flux of ultrahigh energy (UHE) cosmic rays shows a sharp suppression at an energy of $6 \times 10^{19}$ eV, consistent with the expected cutoff energy. We observe the ``ankle'' of the cosmic-ray energy spectrum as well, at an energy of $4 \times 10^{18}$ eV. We describe the experiment, data collection, analysis, and estimate the systematic uncertainties. The results are presented and the calculation of the statistical significance of our observation is described.

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