Composition of Primary Cosmic-Ray Nuclei at High Energies

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dc.creatorAve, M.
dc.creatorBoyle, P. J.
dc.creatorGahbauer, F.
dc.creatorHoppner, C.
dc.creatorHorandel, J. R.
dc.creatorIchimura, M.
dc.creatorMuller, D.
dc.creatorRomero-Wolf, A.
dc.date2008-01-03
dc.date.accessioned2026-07-07T09:38:08Z
dc.date.available2026-07-07T09:38:08Z
dc.descriptionThe 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.
dc.descriptionAccepted for publication in the Astrophysical Journal (3-Jan-08), 37 pages, 15 figures
dc.identifierhttps://arxiv.org/abs/0801.0582
dc.identifierhttp://arxiv.org/abs/0801.0582
dc.identifierThe Astrophysical Journal, 678:262-273, 2008 May 1
dc.identifierdoi:10.1086/529424
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/160703
dc.subjectAstrophysics
dc.titleComposition of Primary Cosmic-Ray Nuclei at High Energies
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