Speaker
Description
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 ratio can be described by a power law Rδ 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.
Keywords
AMS; Fluorine; heavy nuclei; secondary cosmic ray; cosmic ray propagation; latest new AMS result
| Subcategory | Experimental Results |
|---|---|
| Collaboration | AMS |
