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arXiv 0910.2873astro-ph.HE
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超高能倾斜空气簇射中电磁分量的特征

Characterisation of the electromagnetic component in ultra-high energy inclined air showers

I. Valino, J. Alvarez-Muniz, M. Roth, R. A. Vazquez, E. Zas

摘要:

倾斜的空气簇射-那些到达地面的天顶角相对于垂直θ> 60度-的特征是地面上的μ子分量占主导地位,伴随着主要由μ子衰变和μ子相互作用产生的电磁晕。通过蒙特卡罗模拟,我们给出了地面超高能斜簇射中粒子密度随初始能量和质量组成以及模拟中所采用的不同强子模型的函数关系。我们还研究了粒子密度的固有的簇射到簇射波动的影响。

英文摘要:

Inclined air showers - those arriving at ground with zenith angle with respect to the vertical theta > 60 deg - are characterised by the dominance of the muonic component at ground which is accompanied by an electromagnetic halo produced mainly by muon decay and muon interactions. By means of Monte Carlo simulations we give a full characterisation of the particle densities at ground in ultra-high energy inclined showers as a function of primary energy and mass composition, as well as for different hadronic models assumed in the simulations. We also investigate the effect of intrinsic shower-to-shower fluctuations in the particle densities.

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