Observation of the GZK Cutoff

Details Observation of the GZK Cutoff Observation of the GZK Cutoff

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aps..apr.p7008b&link_type=abstract

American Physical Society, APS April Meeting, April 22-26, 2006, abstract #P7.008

Physics

Scientific paper

The GZK Cutoff is the predicted end of the cosmic ray spectrum at an energy of about 6x10^19 eV, and is due to interactions between the cosmic rays and the microwave background. The cutoff was predicted soon after the discovery of the Cosmic Microwave Background, and his been called the Holy Grail of Ultrahigh Energy Cosmic Ray physics. We use evidence from fits to the published HiRes Monocular differential spectra and from the E1/2 criterion, the energy at which the measured integral spectrum is half the expected integral spectrum with no cutoff, to argue that HiRes has observed this cutoff.

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