High-energy Cosmic Rays

Details High-energy Cosmic Rays High-energy Cosmic Rays

2005-10-11

arxiv.org/abs/astro-ph/0510321v1

Astronomy and Astrophysics

Astrophysics

16 pages, 5 fugures, to be published in Nuclear Physics A

Scientific paper

10.1016/j.nuclphysa.2005.01.024

After a brief review of galactic cosmic rays in the GeV to TeV energy range, we describe some current problems of interest for particles of very high energy. Particularly interesting are two features of the spectrum, the `knee' above $10^{15}$ eV and the `ankle' above $10^{18}$ eV. An important question is whether the highest energy particles are of extra-galactic origin and, if so, at what energy the transition occurs. A theme common to all energy ranges is use of nuclear abundances as a tool for understanding the origin of the cosmic radiation.

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