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28 March 2024 |
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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 | Abstract: | A 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 | Services: | Forum | Review | PDF | Favorites |
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