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arXiv 0710.5508astro-ph
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超高能空气簇射的μ子含量：雅库茨克资料与模拟

Muon content of ultra-high-energy air showers: Yakutsk data versus simulations

A. V. Glushkov, I. T. Makarov, M. I. Pravdin, I. E. Sleptsov, D. S. Gorbunov, G. I. Rubtsov, S. V. Troitsky

备注：
8 pages, 3 figures; v2: replaced with journal version
发表信息：
JETPLett.87:190-194,2008
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摘要：

我们分析了33个广泛的空气簇射（EAS）的样本，估计的初级能量超过2 \cdot 10^{19} eV和高质量的μ子数据记录的雅库茨克EAS阵列。我们比较，事件的事件，观察到的μ介子密度预期从CORSIKA模拟的初级质子和铁，使用SIBYLL和EPOS强子相互作用模型。这项研究表明存在两种不同的强子成分，“轻”和“重”。与EPOS的模拟是在一个很好的协议与预期的组合物中，轻组分对应于质子和重组分的类铁核。使用SYBILL，对于相同的电磁信号，铁原色的模拟μ介子密度比重组分的观测值小\sim 1.5倍。假设质子-铁组成为两组分，采用EPOS模型，在95%置信水平下，能量E>10^{19} eV的质子所占比例为0.52^{+0.19}-0.20}。

英文摘要：

We analyse a sample of 33 extensive air showers (EAS) with estimated primary energies above 2\cdot 10^{19} eV and high-quality muon data recorded by the Yakutsk EAS array. We compare, event-by-event, the observed muon density to that expected from CORSIKA simulations for primary protons and iron, using SIBYLL and EPOS hadronic interaction models. The study suggests the presence of two distinct hadronic components, ``light'' and ``heavy''. Simulations with EPOS are in a good agreement with the expected composition in which the light component corresponds to protons and the heavy component to iron-like nuclei. With SYBILL, simulated muon densities for iron primaries are a factor of \sim 1.5 less than those observed for the heavy component, for the same electromagnetic signal. Assuming two-component proton-iron composition and the EPOS model, the fraction of protons with energies E>10^{19} eV is 0.52^{+0.19}_{-0.20} at 95% confidence level.

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