Composition of Primary Cosmic-Ray Nuclei at High Energies

Details Composition of Primary Cosmic-Ray Nuclei at High Energies Composition of Primary Cosmic-Ray Nuclei at High Energies

2008-01-03

arxiv.org/abs/0801.0582v1

The Astrophysical Journal, 678:262-273, 2008 May 1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in the Astrophysical Journal (3-Jan-08), 37 pages, 15 figures

Scientific paper

10.1086/529424

The TRACER instrument (``Transition Radiation Array for Cosmic Energetic Radiation'') has been developed for direct measurements of the heavier primary cosmic-ray nuclei at high energies. The instrument had a successful long-duration balloon flight in Antarctica in 2003. The detector system and measurement process are described, details of the data analysis are discussed, and the individual energy spectra of the elements O, Ne, Mg, Si, S, Ar, Ca, and Fe (nuclear charge Z=8 to 26) are presented. The large geometric factor of TRACER and the use of a transition radiation detector make it possible to determine the spectra up to energies in excess of 10$^{14}$ eV per particle. A power-law fit to the individual energy spectra above 20 GeV per amu exhibits nearly the same spectral index ($\sim$ 2.65 $\pm$ 0.05) for all elements, without noticeable dependence on the elemental charge Z.

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