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arXiv 0906.3075astro-ph.HEhep-ph
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质子-空气截面和广泛的空气簇射

Proton-Air Cross Section and Extensive Air Showers

Ralf Ulrich, Ralph Engel, Steffen Müller, Fabian Schüssler, Michael Unger

摘要:

超高能强子截面对大范围空气簇射叶栅的发展有重要影响。因此,对空气簇射数据的解释主要依赖于强子相互作用模型,该模型将加速器测量的截面外推到最高宇宙射线能量。我们讨论了如何极端的情况下,截面外推可以影响空气簇射数据的解释。我们发现,外推质子-空气截面在超高能量的理论不确定性是远远大于现有的传播可用的蒙特卡罗模型预测建议。证明了对簇射最大值深度的影响。

英文摘要:

Hadronic cross sections at ultra-high energy have a significant impact on the development of extensive air shower cascades. Therefore the interpretation of air shower data depends critically on hadronic interaction models that extrapolate the cross section from accelerator measurements to the highest cosmic ray energies. We discuss how extreme scenarios of cross section extrapolations can affect the interpretation of air shower data. We find that the theoretical uncertainty of the extrapolated proton-air cross section at ultra-high energies is much larger than suggested by the existing spread of available Monte Carlo model predictions. The impact on the depth of the shower maximum is demonstrated.

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