Cosmic Rays: The Second Knee and Beyond

Details Cosmic Rays: The Second Knee and Beyond Cosmic Rays: The Second Knee and Beyond

2007-04-27

arxiv.org/abs/0704.3721v1

J.Phys.G34:R359,2007

Astronomy and Astrophysics

Astrophysics

46 pages, 30 figures. Topical Review to appear in J. Physics G

Scientific paper

10.1088/0954-3899/34/10/R01

We conduct a review of experimental results on Ultra-High Energy Cosmic Rays (UHECR's) including measurements of the features of the spectrum, the composition of the primary particle flux and the search for anisotropy in event arrival direction. We find that while there is a general consensus on the features in the spectrum -- the Second Knee, the Ankle, and (to a lesser extent) the GZK Cutoff -- there is little consensus on the composition of the primaries that accompany these features. This lack of consensus on the composition makes interpretation of the agreed upon features problematic. There is also little direct evidence about potential sources of UHECRs, as early reports of arrival direction anisotropies have not been confirmed in independent measurements.

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