The Elemental Composition of High-Energy Cosmic Rays: Measurements with TRACER

Details The Elemental Composition of High-Energy Cosmic Rays: Measurements with TRACER The Elemental Composition of High-Energy Cosmic Rays: Measurements with TRACER

2008-10-16

arxiv.org/abs/0810.2967v1

Mod.Phys.Lett.A23:2031-2045,2008

Astronomy and Astrophysics

Astrophysics

Modern Physics Letters A, Brief Review, 15 pages, 11 Figures

Scientific paper

10.1142/S0217732308028260

TRACER ('Transition Radiation Array for Cosmic Energetic Radiation') is a balloon borne instrument that has been developed to directly measure the composition and energy spectra of individual heavy elements up to 10^15 eV per particle. TRACER achieves a large geometric factor (5 m^2 sr) through the use of a Transition Radiation Detector utilizing arrays of single wire proportional tubes. TRACER has measured the energy spectra of the elements O, Ne, Mg, Si, S, Ar, Ca, and Fe. The energy spectra reach energies in excess of 10^14 eV per particle and exhibit nearly the same spectral index (2.65 +/- 0.05) for all elements.

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