Antiproton flux and properties of elementary particle fluxes in primary cosmic rays measured with the Alpha Magnetic Spectrometer on the International Space Station

摘要

Precision measurements by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 525 GV is presented, together with the fluxes and flux ratios of charged elementary particles in cosmic rays up to 1 TV. In the absolute rigidity range 60-500 GV, the antiproton (p) over bar, proton p and positron e(+) fluxes are found to have nearly identical rigidity dependence and the electron e(-) flux exhibits different rigidity dependence. From 60GV to 500 GV, the (p) over bar /p, (p) over bar /e(+) and p/e(+) flux ratios are rigidity independent. These AMS measurements continue to reveal important properties of cosmic ray elementary particle fluxes and provide invaluable input towards understanding the origin of many observed unexpected phenomena. (C) 2019 COSPAR. Published by Elsevier Ltd. All rights reserved.