High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5-500 GeV with the Alpha Magnetic Spectrometer on the International Space Station

• Main Authors: Becker, Ulrich J. (Contributor), Behlmann, Matthew Daniel (Contributor), Burger, Joseph D. (Contributor), Cai, Xudong (Contributor), Capell, Michael H. (Contributor), Carosi, G. (Contributor), Chen, Andrew I. (Contributor), Chen, Hai (Contributor), Choumilov, Evgueni (Contributor), Choutko, Vitali (Contributor), Eline, Alexandre (Contributor), Eppling, Frederic J. (Contributor), Fisher, Peter H. (Contributor), Galaktionov, Y. (Contributor), Goglov, Pavel (Contributor), Heil, Melanie (Contributor), Henning, R. (Contributor), Hsieh, Timothy Hwa-wei (Contributor), Kounina, Olga (Contributor), Kounine, Andrei (Contributor), Koutsenko, Vladimir (Contributor), Krafczyk, Matthew Scott (Contributor), Lebedev, Alexei (Contributor), Li, Q. (Contributor), Monreal, Benjamin (Contributor), Plyaskin, Vasily (Contributor), Rozhkov, Andrey B. (Contributor), Rybka, G. (Contributor), Shi, X. Y. (Contributor), Sun, Wei (Contributor), Sun, W. H. (Contributor), Ting, Samuel C. C. (Contributor), Ting, Susan Marks (Contributor), Vaurynovich, Siarhei S. (Contributor), Wang, Xiaozhen (Contributor), Weng, Zhili (Contributor), Xie, M. (Contributor), Xu, Weiwei (Contributor), Zhou, F. (Contributor), Zuccon, Paolo (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Physics (Contributor), Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2014-10-01T14:23:16Z.
• Subjects: Article
• Online Access: Get fulltext

 A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above ∼200  GeV the positron fraction no longer exhibits an increase with energy.