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28 March 2024
 
  » arxiv » 0810.2972

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Propagation and Source Energy Spectra of Cosmic-Ray Nuclei at High Energies
M. Ave ; P.J. Boyle ; C. Hoeppner ; J. Marshall ; D. Muller ;
Date 16 Oct 2008
AbstractA recent measurement of the TRACER instrument on long-duration balloon has determined the individual energy spectra of the major primary cosmic-ray nuclei from oxygen (Z=8) to iron (Z=26). The measurements cover a large range of energies and extend to energies beyond 10^14 eV. We investigate if the data set can be described by a simple but plausible model for acceleration and propagation of cosmic rays. The model assumes a power-law energy spectrum at the source with a common spectral index alpha for all nuclear species, and an energy dependent propagation pathlength (Lambda proportional to E^-0.6) combined with an energy-independent residual pathlength Lambda_0. We find that the data can be fit with a fairly soft source spectrum alpha=2.3-2.4), and with a residual pathlength Lambda_0 as high as 0.3 g cm^-2. We discuss this model in the context of other pertinent information, and we determine the relative abundances of the elements at the cosmic-ray source.
Source arXiv, 0810.2972
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