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Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), E-28040 Madrid, Spain.
I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germany.
Phys Rev Lett. 2018 Jan 12;120(2):021101. doi: 10.1103/PhysRevLett.120.021101.
We report on the observation of new properties of secondary cosmic rays Li, Be, and B measured in the rigidity (momentum per unit charge) range 1.9 GV to 3.3 TV with a total of 5.4×10^{6} nuclei collected by AMS during the first five years of operation aboard the International Space Station. The Li and B fluxes have an identical rigidity dependence above 7 GV and all three fluxes have an identical rigidity dependence above 30 GV with the Li/Be flux ratio of 2.0±0.1. The three fluxes deviate from a single power law above 200 GV in an identical way. This behavior of secondary cosmic rays has also been observed in the AMS measurement of primary cosmic rays He, C, and O but the rigidity dependences of primary cosmic rays and of secondary cosmic rays are distinctly different. In particular, above 200 GV, the secondary cosmic rays harden more than the primary cosmic rays.
我们报告了对次级宇宙射线锂、铍和硼新特性的观测结果。这些观测是在国际空间站上运行的前五年中，由阿尔法磁谱仪（AMS）在1.9吉伏至3.3太伏的刚度（单位电荷的动量）范围内进行的，共收集了5.4×10⁶个原子核。锂和硼通量在7吉伏以上具有相同的刚度依赖性，并且在30吉伏以上所有三种通量都具有相同的刚度依赖性，锂/铍通量比为2.0±0.1。在200吉伏以上，这三种通量以相同的方式偏离单一幂律。这种次级宇宙射线的行为在AMS对初级宇宙射线氦、碳和氧的测量中也有观察到，但初级宇宙射线和次级宇宙射线的刚度依赖性明显不同。特别是，在200吉伏以上，次级宇宙射线比初级宇宙射线更硬。
