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arXiv 1010.3019astro-ph.HEhep-ph
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超高能Cosmic Ray核解析解的再研究

Analytic Solutions of Ultra-High Energy Cosmic Ray Nuclei Revisited

Markus Ahlers, Andrew M. Taylor

摘要:

超高能宇宙射线的化学成分是粒子天体物理学中的一个关键问题。从宇宙射线簇射的延伸率推断的测量成分总体上看与初始源成分非常不同:宇宙辐射背景中的共振光衰变在最高能量下迅速进行,并且初始成分在传播过程中迅速变得更轻。为了对不断改进的宇宙线数据进行统计分析,需要尽可能精确地知道次级谱。本文讨论了超高能宇宙线核演化方程的精确解析解。我们引入一个图解形式主义,导致系统的解析扩展的精确解的传播的二阶效应。我们展示了如何一阶修正这种膨胀可以提高二级光谱的预测中的半解析处理。

英文摘要:

The chemical composition of ultra-high energy cosmic rays is a key question in particle astrophysics. The measured composition, inferred from the elongation rates of cosmic ray showers, looks in general very different from the initial source composition: resonant photo-disintegration in the cosmic radiation background proceeds rapidly at the highest energies and the initial composition quickly becomes lighter during propagation. For a statistical analysis of continuously improving cosmic ray data it is desirable to know the secondary spectra as precisely as possible. Here, we discuss exact analytic solutions of the evolution equation of ultra-high energy cosmic ray nuclei. We introduce a diagrammatic formalism that leads to a systematic analytic expansion of the exact solution in terms of second order effects of the propagation. We show how the first order corrections of this expansion can improve the predictions of secondary spectra in a semi-analytical treatment.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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