Properties of Heavy Secondary Fluorine Cosmic Rays: Results from the Alpha Magnetic Spectrometer
Properties of Heavy Secondary Fluorine Cosmic Rays: Results from the Alpha Magnetic Spectrometer
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DOI：
10.1103/physrevlett.126.081102
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发表时间：
2021-02-25
影响因子：
8.6
通讯作者：
Zuccon, P.
中科院分区：
文献类型：
--
作者：
Aguilar, M.;Cavasonza, L. Ali;Zuccon, P.
精确了解次级宇宙线通量和次级与初级通量比的电荷和刚度依赖性对于理解宇宙线传播至关重要。根据国际空间站阿尔法磁谱仪实验收集的29万个事件，我们报告了刚性R范围为2.15 GV至2.9 TV的重次级宇宙线氟F的性质。氟的光谱在200 GV以上偏离单一的幂律。较重的二次与一次F/Si通量比刚性依赖性明显不同于较轻的B/O（或B/C）刚性依赖性。特别地，在10 GV以上，F/Si/B/O比率可以由幂律R-δ描述，其中δ = 0.052 +/-0.007。这表明，从F到Si的重宇宙线的传播特性与从He到O的轻宇宙线的传播特性不同，次级宇宙线有两类。
Precise knowledge of the charge and rigidity dependence of the secondary cosmic ray fluxes and the secondary-to-primary flux ratios is essential in the understanding of cosmic ray propagation. We report the properties of heavy secondary cosmic ray fluorine F in the rigidity R range 2.15 GV to 2.9 TV based on 0.29 million events collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. The fluorine spectrum deviates from a single power law above 200 GV. The heavier secondary-to-primary F/Si flux ratio rigidity dependence is distinctly different from the lighter B/O (or B/C) rigidity dependence. In particular, above 10 GV, the F/Si/B/O ratio can be described by a power law R-delta with delta = 0.052 +/- 0.007. This shows that the propagation properties of heavy cosmic rays, from F to Si, are different from those of light cosmic rays, from He to O, and that the secondary cosmic rays have two classes.