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Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, Spain.
I. Physics Institute and JARA-FAME, RWTH Aachen University, 52056 Aachen, Germany.
Phys Rev Lett. 2021 Feb 26;126(8):081102. doi: 10.1103/PhysRevLett.126.081102.
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^{δ} with δ=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.
精确了解次级宇宙射线通量以及次级与初级通量比的电荷和刚性依赖性对于理解宇宙射线传播至关重要。我们基于国际空间站上阿尔法磁谱仪实验收集的29万个事件，报告了刚性R在2.15吉伏至2.9太伏范围内重次级宇宙射线氟F的特性。氟谱在200吉伏以上偏离单一幂律。较重的次级与初级F/Si通量比的刚性依赖性与较轻的B/O（或B/C）刚性依赖性明显不同。特别是，在10吉伏以上，F/Si/B/O比可用幂律R^δ描述，其中δ = 0.052±0.007。这表明从重宇宙射线F到Si的传播特性与从轻宇宙射线He到O的传播特性不同，且次级宇宙射线有两类。
