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arXiv 1012.2722astro-ph.HE
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从3-3000 GV范围内质子和铁谱的比较得到的银河系中cosmic ray逃逸长度的刚性依赖性

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

Olga Strelnikova, Lyubov Sveshnikova, Vladimir Ptuskin

摘要:

简单的漏盒模型的宇宙射线在银河系中的传播是相当适合于处理数据的宇宙射线核的能量谱和成分在E?1 GeV [1,2]。在漏盒模型中,宇宙线在银河系中传播的全部信息被压缩成单个参数--逃逸长度,表征宇宙射线从源到地球的物质的平均克数。本文分析了过去收集的质子和铁宇宙线谱的世界数据(HEAO,CRN等)。和最近的一系列电子实验(ATIC,CREAM,MS,BESS,Tracer等)。并且从测量的质子/铁比的刚性依赖性获得逃逸长度的刚性依赖性,R(R)= R^(-0.47 \pm -0.03)。这与用标准方法估算的次生/初生核比值相当吻合。但在R > 300 GV时,γ(R)的行为发生了明显的变化,这可以(解释的变体)指出宇宙线源中质子/铁比的变化。

英文摘要:

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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