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arXiv 1002.2472astro-ph.HE
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用EAS阵列测量超高能宇宙射线能谱的比较

Comparing the energy spectra of ultra-high energy cosmic rays measured with EAS arrays

A. A. Ivanov

摘要:

利用巨型广延空气簇射(EAS)阵列测量的超高能宇宙射线(CR)能谱显示出通量强度和/或CR能量估计值之间的差异超过了实验误差。由于在快速下降的能谱的存在下测量量的分散而引起的众所周知的强度校正因子不足以解释发散。系统能量测定误差的另一个来源,提出了关于带电粒子密度测量的表面阵列,这是由于简化(即叠加近似)在核-核相互作用的描述适用于簇射建模。利用必要的修正因子,在实验误差范围内得到一致的CR能谱。巨型阵列的能量尺度的残余差异可以归因于所使用的EAS检测技术的实际整体精度。CR加速和传播模型模拟使用的倾角和脚踝的情况下,从银河系到河外CR组件的过渡与EAS阵列观察到的组合能谱是一致的。

英文摘要:

The energy spectra of ultra-high energy cosmic rays (CRs) measured with giant extensive air shower (EAS) arrays exhibit discrepancies between the flux intensities and/or estimated CR energies exceeding experimental errors. The well-known intensity correction factor due to the dispersion of the measured quantity in the presence of a rapidly falling energy spectrum is insufficient to explain the divergence. Another source of systematic energy determination error is proposed concerning the charged particle density measured with the surface arrays, which arises due to simplifications (namely, the superposition approximation) in nucleus-nucleus interaction description applied to the shower modeling. Making use of the essential correction factors results in congruous CR energy spectra within experimental errors. Residual differences in the energy scales of giant arrays can be attributed to the actual overall accuracy of the EAS detection technique used. CR acceleration and propagation model simulations using the dip and ankle scenarios of the transition from galactic to extragalactic CR components are in agreement with the combined energy spectrum observed with EAS arrays.

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