%0 Generic %1 collaboration2007first %A HiRes\ Collaboration, %D 2007 %K cutoff gzk hires %R 10.1103/PhysRevLett.100.101101 %T First Observation of the Greisen-Zatsepin-Kuzmin Suppression %U http://arxiv.org/abs/astro-ph/0703099 %X 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 $6 10^19$ 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.

@misc{collaboration2007first, abstract = {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.}, added-at = {2015-02-03T18:37:08.000+0100}, author = {HiRes{\ }Collaboration}, biburl = {https://www.bibsonomy.org/bibtex/2b1f35820eac32059113588e3341e94c1/watz}, description = {[astro-ph/0703099] First Observation of the Greisen-Zatsepin-Kuzmin Suppression}, doi = {10.1103/PhysRevLett.100.101101}, interhash = {d04749fdacfb650bab84994200971be5}, intrahash = {b1f35820eac32059113588e3341e94c1}, keywords = {cutoff gzk hires}, note = {cite arxiv:astro-ph/0703099 Comment: 4 pages, 3 figures, accepted by and to appear in PRL}, timestamp = {2015-02-04T01:08:13.000+0100}, title = {First Observation of the Greisen-Zatsepin-Kuzmin Suppression}, url = {http://arxiv.org/abs/astro-ph/0703099}, year = 2007 }