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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.

  • Accardo L INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Aguilar M Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Aisa D INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Alpat B INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Alvino A INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Ambrosi G INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Andeen K Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB.
  • Arruda L Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Attig N Jülich Supercomputing Centre and JARA-FAME, Research Centre Jülich, D-52425 Jülich, GermanyA.
  • Azzarello P DPNC, Université de Genève, CH-1211 Genève 4, Switzerland and INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Bachlechner A I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Barao F Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Barrau A Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France.
  • Barrin L European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland.
  • Bartoloni A INFN-Sezione di Roma 1, I-00185 Roma, Italyx.
  • Basara L Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France and INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx.
  • Battarbee M Space Research Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.
  • Battiston R INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx.
  • Bazo J INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Becker U Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Behlmann M Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Beischer B I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Berdugo J Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Bertucci B INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Bigongiari G INFN-Sezione di Pisa, I-56100 Pisa, Italyx and Università di Pisa, I-56100 Pisa, Italy.
  • Bindi V Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA.
  • Bizzaglia S INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Bizzarri M INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Boella G INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx and Università di Milano-Bicocca, I-20126 Milano, Italy.
  • de Boer W Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB.
  • Bollweg K NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA.
  • Bonnivard V Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France.
  • Borgia B INFN-Sezione di Roma 1, I-00185 Roma, Italyx and Università di Roma La Sapienza, I-00185 Roma, Italy.
  • Borsini S INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Boschini MJ INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx.
  • Bourquin M DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Burger J Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Cadoux F DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Cai XD Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Capell M Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Caroff S Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Carosi G Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Casaus J Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Cascioli V INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Castellini G CNR-IROE, I-50125 Firenze, Italy.
  • Cernuda I Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Cerreta D INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Cervelli F INFN-Sezione di Pisa, I-56100 Pisa, Italyx.
  • Chae MJ Department of Physics, Ewha Womans University, Seoul 120-750, KoreaE.
  • Chang YH National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany.
  • Chen AI Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Chen H Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Cheng GM Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw.
  • Chen HS Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw.
  • Cheng L Shandong University, SDU, Jinan, Shandong 250100, China.
  • Chikanian A Physics Department, Yale University, New Haven, Connecticut 06520, USA.
  • Chou HY National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany.
  • Choumilov E Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Choutko V Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Chung CH I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Cindolo F INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Clark C NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA.
  • Clavero R Instituto de Astrofísica de Canarias, IAC, E-38205 La Laguna, Tenerife, Spain.
  • Coignet G Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Consolandi C Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA.
  • Contin A INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Corti C Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA.
  • Coste B INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx.
  • Cui Z Shandong University, SDU, Jinan, Shandong 250100, China.
  • Dai M Institute of Electrical Engineering, IEE, Chinese Academy of Sciences, Beijing 100080, China.
  • Delgado C Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Della Torre S INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx.
  • Demirköz MB Department of Physics, Middle East Technical University, METU, 06800 Ankara, Turkeyv.
  • Derome L Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France.
  • Di Falco S INFN-Sezione di Pisa, I-56100 Pisa, Italyx.
  • Di Masso L INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Dimiccoli F INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx.
  • Díaz C Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • von Doetinchem P Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA.
  • Du WJ Shandong University, SDU, Jinan, Shandong 250100, China.
  • Duranti M INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • D'Urso D INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Eline A Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Eppling FJ Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Eronen T Space Research Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.
  • Fan YY Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany.
  • Farnesini L INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Feng J Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Fiandrini E INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Fiasson A Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Finch E Physics Department, Yale University, New Haven, Connecticut 06520, USA.
  • Fisher P Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Galaktionov Y Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Gallucci G European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and INFN-Sezione di Pisa, I-56100 Pisa, Italyx.
  • García B Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • García-López R Instituto de Astrofísica de Canarias, IAC, E-38205 La Laguna, Tenerife, Spain.
  • Gast H I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Gebauer I Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB.
  • Gervasi M INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx and Università di Milano-Bicocca, I-20126 Milano, Italy.
  • Ghelfi A Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France.
  • Gillard W National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany.
  • Giovacchini F Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Goglov P Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Gong J Southeast University, SEU, Nanjing 210096, China.
  • Goy C Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Grabski V Instituto de Física, Universidad Nacional Autónoma de México, UNAM, México D.F. 01000, MéxicoD.
  • Grandi D INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx.
  • Graziani M European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Guandalini C INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Guerri I INFN-Sezione di Pisa, I-56100 Pisa, Italyx and Università di Pisa, I-56100 Pisa, Italy.
  • Guo KH Sun Yat-Sen University, SYSU, Guangzhou 510275, China.
  • Haas D DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Habiby M DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Haino S National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany and Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany.
  • Han KC National Chung-Shan Institute of Science and Technology, NCSIST, Longtan, Tao Yuan 325, Taiwan.
  • He ZH Sun Yat-Sen University, SYSU, Guangzhou 510275, China.
  • Heil M Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA and Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB.
  • Henning R Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Hoffman J National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany.
  • Hsieh TH Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Huang ZC Sun Yat-Sen University, SYSU, Guangzhou 510275, China.
  • Huh C CHEP, Kyungpook National University, 702-701 Daegu, Koreaz.
  • Incagli M INFN-Sezione di Pisa, I-56100 Pisa, Italyx.
  • Ionica M INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Jang WY CHEP, Kyungpook National University, 702-701 Daegu, Koreaz.
  • Jinchi H National Chung-Shan Institute of Science and Technology, NCSIST, Longtan, Tao Yuan 325, Taiwan.
  • Kanishev K INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx.
  • Kim GN CHEP, Kyungpook National University, 702-701 Daegu, Koreaz.
  • Kim KS CHEP, Kyungpook National University, 702-701 Daegu, Koreaz.
  • Kirn T I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Kossakowski R Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Kounina O Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Kounine A Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Koutsenko V Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Krafczyk MS Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Kunz S Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB.
  • La Vacca G European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx.
  • Laudi E INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Laurenti G INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Lazzizzera I INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx.
  • Lebedev A Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Lee HT Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany.
  • Lee SC Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany.
  • Leluc C DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Levi G INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Li HL Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany.
  • Li JQ Southeast University, SEU, Nanjing 210096, China.
  • Li Q Southeast University, SEU, Nanjing 210096, China.
  • Li Q Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Li TX Sun Yat-Sen University, SYSU, Guangzhou 510275, China.
  • Li W Beihang University, BUAA, Beijing 100191, China.
  • Li Y DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Li ZH Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw.
  • Li ZY Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany.
  • Lim S Department of Physics, Ewha Womans University, Seoul 120-750, KoreaE.
  • Lin CH Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany.
  • Lipari P INFN-Sezione di Roma 1, I-00185 Roma, Italyx.
  • Lippert T Jülich Supercomputing Centre and JARA-FAME, Research Centre Jülich, D-52425 Jülich, GermanyA.
  • Liu D Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwany.
  • Liu H Southeast University, SEU, Nanjing 210096, China.
  • Lolli M INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Lomtadze T INFN-Sezione di Pisa, I-56100 Pisa, Italyx.
  • Lu MJ INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx.
  • Lu YS Institute of High Energy Physics, IHEP, Chinese Academy of Sciences, Beijing 100039, Chinaw.
  • Luebelsmeyer K I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Luo F Shandong University, SDU, Jinan, Shandong 250100, China.
  • Luo JZ Southeast University, SEU, Nanjing 210096, China.
  • Lv SS Sun Yat-Sen University, SYSU, Guangzhou 510275, China.
  • Majka R Physics Department, Yale University, New Haven, Connecticut 06520, USA.
  • Malinin A IPST, University of Maryland, College Park, Maryland 20742, USA.
  • Mañá C Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Marín J Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Martin T NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA.
  • Martínez G Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Masi N INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Massera F INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Maurin D Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France.
  • Menchaca-Rocha A Instituto de Física, Universidad Nacional Autónoma de México, UNAM, México D.F. 01000, MéxicoD.
  • Meng Q Southeast University, SEU, Nanjing 210096, China.
  • Mo DC Sun Yat-Sen University, SYSU, Guangzhou 510275, China.
  • Monreal B Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Morescalchi L INFN-Sezione di Pisa, I-56100 Pisa, Italyx.
  • Mott P NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA.
  • Müller M I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Ni JQ Sun Yat-Sen University, SYSU, Guangzhou 510275, China.
  • Nikonov N Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB.
  • Nozzoli F INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Nunes P Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Obermeier A I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Oliva A Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Orcinha M Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Palmonari F INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Palomares C Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Paniccia M DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Papi A INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Pauluzzi M INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Pedreschi E INFN-Sezione di Pisa, I-56100 Pisa, Italyx.
  • Pensotti S INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx and Università di Milano-Bicocca, I-20126 Milano, Italy.
  • Pereira R Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA and Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Pilastrini R INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Pilo F INFN-Sezione di Pisa, I-56100 Pisa, Italyx.
  • Piluso A INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Pizzolotto C INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Plyaskin V Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Pohl M DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Poireau V Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Postaci E Department of Physics, Middle East Technical University, METU, 06800 Ankara, Turkeyv.
  • Putze A Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Quadrani L INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Qi XM Sun Yat-Sen University, SYSU, Guangzhou 510275, China.
  • Rancoita PG INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx.
  • Rapin D DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Ricol JS Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France.
  • Rodríguez I Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Rosier-Lees S Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Rossi L European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland.
  • Rozhkov A Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Rozza D INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx.
  • Rybka G Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Sagdeev R East-West Center for Space Science, University of Maryland, College Park, Maryland 20742, USA.
  • Sandweiss J Physics Department, Yale University, New Haven, Connecticut 06520, USA.
  • Saouter P DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Sbarra C INFN-Sezione di Bologna, I-40126 Bologna, Italyx and Università di Bologna, I-40126 Bologna, Italy.
  • Schael S I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Schmidt SM Jülich Supercomputing Centre and JARA-FAME, Research Centre Jülich, D-52425 Jülich, GermanyA.
  • Schuckardt D Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB.
  • Schulz von Dratzig A I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Schwering G I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Scolieri G INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Seo ES IPST, University of Maryland, College Park, Maryland 20742, USA.
  • Shan BS Beihang University, BUAA, Beijing 100191, China.
  • Shan YH Beihang University, BUAA, Beijing 100191, China.
  • Shi JY Southeast University, SEU, Nanjing 210096, China.
  • Shi XY Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Shi YM Shanghai Jiaotong University, SJTU, Shanghai 200030, China.
  • Siedenburg T I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
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  • 2014-10-04
Published in:
  • Physical review letters. - 2014
English 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.
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