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 $\frac{\mathrm{F}/\mathrm{Si}}{\mathrm{B}/\mathrm{O}}$ ratio can be described by a power law $R^{\delta }$ with $\delta =0.052\pm 0.007$. 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.

中文翻译：

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二次氟重宇宙射线的特性：阿尔法磁谱仪的结果

精确了解次级宇宙射线通量的电荷和刚度依赖性以及次级与初次通量之比对于了解宇宙射线的传播至关重要。我们报告了重次宇宙射线中的氟F的性质$\mathrm{[R}$根据国际空间站Alpha电磁光谱仪实验收集到的29万个事件，得出了2.15 GV至2.9 TV的变化范围。氟光谱偏离200 GV以上的单一功率定律。次要的与主要的F / Si通量比的刚性相关性与轻的B / O（或B / C）刚性相关性明显不同。特别是高于10 GV时，$\frac{\mathrm{F}/硅}{\mathrm{乙}/\mathrm{Ø}}$ 比率可以用幂定律来描述 ${\mathrm{[R}}^{\delta }$ 和 $\delta =0.052\pm 0.007$。这表明从F到Si的重宇宙射线的传播特性与从He到O的轻宇宙射线的传播特性不同，并且次级宇宙射线具有两类。