First observation of the Greisen-Zatsepin-Kuzmin suppression.
Phys Rev Lett
; 100(10): 101101, 2008 Mar 14.
Article
em En
| MEDLINE
| ID: mdl-18352170
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 cosmic rays shows a sharp suppression at an energy of 6 x 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 x 10(18) eV. We describe the experiment, data collection, and 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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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2008
Tipo de documento:
Article