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The simple leaky-box model of propagation of cosmic rays in the Galaxy isquite suitable for handling data on cosmic ray nuclei energy spectra andcomposition at E ? 1 GeV [1,2]. In the leakybox model a full information aboutcosmic ray propagation in Galaxy is compressed to the single parameter - escapelength, Xe, characterizing mean grams of a matter passed by cosmic rays fromsources to the Earth. In this paper we analyze the world data on proton andiron cosmic ray spectra collected in the past (HEAO, CRN et al.) and in seriesof recent electronic experiments (ATIC, CREAM, MS, BESS, Tracer et al.) andobtain 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 quiteagrees with the one stimated in standard manner from the secondary/primarynuclei ratio. But at R > 300 GV the behavior of Xe(R)distinctly changes, thatcan (variant of explanation)point out to the change of proton/iron ratio incosmic ray sources.

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