Rigidity dependence of cosmic ray escape length in the Galaxy obtained from a comparison of proton and iron spectra in the range 3-3000 GV

Details Rigidity dependence of cosmic ray escape length in the Galaxy obtained from a comparison of proton and iron spectra in the range 3-3000 GV Rigidity dependence of cosmic ray escape length in the Galaxy obtained from a comparison of proton and iron spectra in the range 3-3000 GV

2010-12-13

arxiv.org/abs/1012.2722v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

The proceedings of 31 ICRC, Lodz, 2009

Scientific paper

The simple leaky-box model of propagation of cosmic rays in the Galaxy is quite suitable for handling data on cosmic ray nuclei energy spectra and composition at E ? 1 GeV [1,2]. In the leakybox model a full information about cosmic ray propagation in Galaxy is compressed to the single parameter - escape length, Xe, characterizing mean grams of a matter passed by cosmic rays from sources to the Earth. In this paper we analyze the world data on proton and iron cosmic ray spectra collected in the past (HEAO, CRN et al.) and in series of recent electronic experiments (ATIC, CREAM, MS, BESS, Tracer et al.) and obtain the rigidity dependence of escape length, Xe(R) = R^(-0.47\pm-0.03), from the measured rigidity dependence of the protons/iron ratio. It quite agrees with the one stimated in standard manner from the secondary/primary nuclei ratio. But at R > 300 GV the behavior of Xe(R)distinctly changes, that can (variant of explanation)point out to the change of proton/iron ratio in cosmic ray sources.

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