Elemental energy spectra of cosmic rays measured by CREAM-II

Details Elemental energy spectra of cosmic rays measured by CREAM-II Elemental energy spectra of cosmic rays measured by CREAM-II

2010-03-30

arxiv.org/abs/1003.5759v1

Proc. of the 31st International Cosmic Ray Conference Lodz (2009)

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

4 pages, 3 figures, presented at ICRC 2009, Lodz, Poland

Scientific paper

We present new measurements of the energy spectra of cosmic-ray (CR) nuclei from the second flight of the balloon-borne experiment CREAM (Cosmic Ray Energetics And Mass). The instrument (CREAM-II) was comprised of detectors based on different techniques (Cherenkov light, specific ionization in scintillators and silicon sensors) to provide a redundant charge identification and a thin ionization calorimeter capable of measuring the energy of cosmic rays up to several hundreds of TeV. The data analysis is described and the individual energy spectra of C, O, Ne, Mg, Si and Fe are reported up to ~ 10^14 eV. The spectral shape looks nearly the same for all the primary elements and can be expressed as a power law in energy E^{-2.66+/-0.04}. The nitrogen absolute intensity in the energy range 100-800 GeV/n is also measured.

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