Abstract
We report the observation of new properties of primary iron (Fe) cosmic rays in the rigidity range 2.65GV to 3.0 TV with 0.62×10^{6} iron nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. Above 80.5GV 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.
Highlights
Featured in PhysicsProperties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer
12IPST, University of Maryland, College Park, Maryland 20742, USA 13CHEP, Kyungpook National University, 41566 Daegu, Korea 14CNR–IROE, 50125 Firenze, Italy
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 × 106 iron nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station
Summary
Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer. Physics Institute and JARA-FAME, RWTH Aachen University, 52056 Aachen, Germany 2Department of Physics, Middle East Technical University (METU), 06800 Ankara, Turkey 3Univ. Savoie Mont Blanc, CNRS, LAPP-IN2P3, 74000 Annecy, France. Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38000 Grenoble, France 18Kapteyn Astronomical Institute, University of Groningen, P.O. Box 800, 9700 AV Groningen, Netherlands
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