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arXiv 1502.00305astro-ph.HE
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宇宙射线:从$10^{10}$到$10^{20}$ eV的光谱和化学组成

Cosmic rays: the spectrum and chemical composition from $10^{10}$ to $10^{20}$ eV

C. J. Todero Peixoto, Vitor de Souza, Peter L. Biermann

摘要:

宇宙中高能粒子的产生仍然是现代科学的重大谜团之一。天体物理源的加速机制以及通过银河系和河外介质传播的细节仍有待确定。近年来,通过使用不同技术的几次实验,在\energy{10}至\energyEV{20.5}的能量范围内高精度地测量了宇宙线通量。在某些能量范围内,可以确定单个元素的通量(氢到铁核)。本文探讨了一个天体物理的情况下,只有我们的银河系和无线电星系岑A产生的所有粒子在地球上测量的能量范围从\energy{10}到\energyEV{20.5}。考虑了AMS-02、CREAM、KASCADE、KASCADE-Grande和Pierre Auger天文台的数据。这里开发的模型是能够描述的总的和单个粒子通量的所有实验考虑。结果表明,这里所使用的理论是能够描述从空间为基础的地面测量的平滑过渡。在该模型框架内还探讨了由KASCADE和KASCADE-Grande测定的各元素的通量以及由\energyEV{18}上方的Pierre Auger天文台测定的质量灵敏度参数\xmax。仔细分析了从\energy{16}到\energyEV{18}的转换。它表明,在这个能量范围内测量的数据表明,存在一个额外的宇宙射线尚未了解的组成部分。

英文摘要:

The production of energetic particles in the universe remains one of the great mysteries of modern science. The mechanisms of acceleration in astrophysical sources and the details about the propagation through the galactic and extragalactic media are still to be defined. In recent years, the cosmic ray flux has been measured with high precision in the energy range from \energy{10} to \energyEV{20.5} by several experiments using different techniques. In some energy ranges, it has been possible to determine the flux of individual elements (hydrogen to iron nuclei). This paper explores an astrophysical scenario in which only our Galaxy and the radio galaxy Cen A produce all particles measured on Earth in the energy range from \energy{10} to \energyEV{20.5}. Data from AMS-02, CREAM, KASCADE, KASCADE-Grande and the Pierre Auger Observatories are considered. The model developed here is able to describe the total and individual particle flux of all experiments considered. It is shown that the theory used here is able to describe the smooth transition from space-based to ground-based measurements. The flux of each element as determined by KASCADE and KASCADE-Grande and the mass sensitivity parameter \xmax measured by the Pierre Auger Observatory above \energyEV{18} are also explored within the framework of the model. The transition from \energy{16} to \energyEV{18} is carefully analyzed. It is shown that the data measured in this energy range suggest the existence of an extra component of cosmic rays yet to be understood.

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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