Jul 12 – 23, 2021
Europe/Berlin timezone

Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer

Jul 14, 2021, 6:00 PM
1h 30m


Talk CRD | Cosmic Ray Direct Discussion


Yao Chen (Shandong Institute of Advanced Technology (SDIAT))


We report the observation of new properties of primary iron (Fe) cosmic rays in the rigidity range 2.65 GV to 3.0 TV with 0.62 million iron nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. Above 80.5 GV the rigidity dependence of the cosmic ray Fe flux is identical to the rigidity dependence of the primary cosmic ray He, C, and O fluxes, with the Fe/O flux ratio being constant at 0.155±0.006. This shows that unexpectedly Fe and He, C, and O belong to the same class of primary cosmic rays which is different from the primary cosmic rays Ne, Mg, and Si class.


Cosmic-ray composition, Cosmic-ray spectra, Cosmic-ray sources, Cosmic-ray acceleration, Cosmic-ray propagation, Cosmic rays and astroparticles

Collaboration AMS
Subcategory Experimental Results

Primary author

Yao Chen (Shandong Institute of Advanced Technology (SDIAT))


Presentation materials