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Article
Title 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
Author(s)

Accardo, L (INFN, Perugia) ; Aguilar, M (Madrid, CIEMAT) ; Aisa, D (INFN, Perugia ; U. Perugia (main)) ; Alpat, B (INFN, Perugia) ; Alvino, A (INFN, Perugia) ; Ambrosi, G (INFN, Perugia) ; Andeen, K (Karlsruhe U., EKP) ; Arruda, L (LIP, Lisbon) ; Attig, N (Julich, NIC ; JARA-FAME, Jülich) ; Azzarello, P (Geneva U. ; INFN, Perugia) ; Bachlechner, A (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Barao, F (LIP, Lisbon) ; Barrau, A (LPSC, Grenoble) ; Barrin, L (CERN) ; Bartoloni, A (INFN, Rome) ; Basara, L (Annecy, LAPP ; Savoie U. (main) ; INFN, Trento ; Trento U.) ; Battarbee, M (Turku U.) ; Battiston, R (INFN, Trento ; Trento U.) ; Bazo, J (INFN, Perugia) ; Becker, U (MIT) ; Behlmann, M (MIT) ; Beischer, B (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Berdugo, J (Madrid, CIEMAT) ; Bertucci, B (INFN, Perugia ; U. Perugia (main)) ; Bigongiari, G (INFN, Pisa ; U. Pisa (main)) ; Bindi, V (Hawaii U.) ; Bizzaglia, S (INFN, Perugia) ; Bizzarri, M (INFN, Perugia ; U. Perugia (main)) ; Boella, G (INFN, Milan Bicocca ; Milan Bicocca U.) ; de Boer, W (Karlsruhe U., EKP) ; Bollweg, K (NASA, Houston ; Jacobs-Sverdrup, Houston) ; Bonnivard, V (LPSC, Grenoble) ; Borgia, B (INFN, Rome ; U. Rome La Sapienza (main)) ; Borsini, S (INFN, Perugia) ; Boschini, M J (INFN, Milan Bicocca) ; Bourquin, M (Geneva U.) ; Burger, J (MIT) ; Cadoux, F (Geneva U.) ; Cai, X D (MIT) ; Capell, M (MIT) ; Caroff, S (Annecy, LAPP ; Savoie U. (main)) ; Carosi, G (MIT) ; Casaus, J (Madrid, CIEMAT) ; Cascioli, V (INFN, Perugia) ; Castellini, G (Florence, IROE) ; Cernuda, I (Madrid, CIEMAT) ; Cerreta, D (INFN, Perugia ; U. Perugia (main)) ; Cervelli, F (INFN, Pisa) ; Chae, M J (Ewha Women's U., Seoul) ; Chang, Y H (Taiwan, Natl. Central U.) ; Chen, A I (MIT) ; Chen, H (MIT) ; Cheng, G M (Beijing, Inst. High Energy Phys.) ; Chen, H S (Beijing, Inst. High Energy Phys.) ; Cheng, L (Shandong U.) ; Chikanian, A (Yale U.) ; Chou, H Y (Taiwan, Natl. Central U.) ; Choumilov, E (MIT) ; Choutko, V (MIT) ; Chung, C H (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Cindolo, F (INFN, Bologna ; U. Bologna (main)) ; Clark, C (NASA, Houston ; Jacobs-Sverdrup, Houston) ; Clavero, R (IAC, La Laguna) ; Coignet, G (Annecy, LAPP ; Savoie U. (main)) ; Consolandi, C (Hawaii U.) ; Contin, A (INFN, Bologna ; U. Bologna (main)) ; Corti, C (Hawaii U.) ; Coste, B (INFN, Trento ; Trento U.) ; Cui, Z (Shandong U.) ; Dai, M (Inst. Electr. Engin., Beijing) ; Delgado, C (Madrid, CIEMAT) ; Della Torre, S (INFN, Milan Bicocca) ; Demirköz, M B (Middle East Tech. U., Ankara) ; Derome, L (LPSC, Grenoble) ; Di Falco, S (INFN, Pisa) ; Di Masso, L (INFN, Perugia ; U. Perugia (main)) ; Dimiccoli, F (INFN, Trento ; Trento U.) ; Díaz, C (Madrid, CIEMAT) ; von Doetinchem, P (Hawaii U.) ; Du, W J (Shandong U.) ; Duranti, M (INFN, Perugia) ; D’Urso, D (INFN, Perugia) ; Eline, A (MIT) ; Eppling, F J (MIT) ; Eronen, T (Turku U.) ; Fan, Y Y (Taiwan, Inst. Phys. ; Xian Jiaotong U. ; China Scholarship Council) ; Farnesini, L (INFN, Perugia) ; Feng, J (Annecy, LAPP ; Savoie U. (main) ; SYSU, Guangzhou ; China Scholarship Council) ; Fiandrini, E (INFN, Perugia ; U. Perugia (main)) ; Fiasson, A (Annecy, LAPP ; Savoie U. (main)) ; Finch, E (Yale U.) ; Fisher, P (MIT) ; Galaktionov, Y (MIT) ; Gallucci, G (CERN ; INFN, Pisa) ; García, B (Madrid, CIEMAT) ; García-López, R (IAC, La Laguna) ; Gast, H (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Gebauer, I (Karlsruhe U., EKP) ; Gervasi, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Ghelfi, A (LPSC, Grenoble) ; Gillard, W (Taiwan, Natl. Central U.) ; Giovacchini, F (Madrid, CIEMAT) ; Goglov, P (MIT) ; Gong, J (Southeast U., Nanjing) ; Goy, C (Annecy, LAPP ; Savoie U. (main)) ; Grabski, V (Mexico U.) ; Grandi, D (INFN, Milan Bicocca) ; Graziani, M (CERN ; INFN, Perugia) ; Guandalini, C (INFN, Bologna ; U. Bologna (main)) ; Guerri, I (INFN, Pisa ; U. Pisa (main)) ; Guo, K H (Zhongshan U.) ; Haas, D (Geneva U.) ; Habiby, M (Geneva U.) ; Haino, S (Taiwan, Natl. Central U. ; Taiwan, Inst. Phys.) ; Han, K C (CSIST, Taiwan) ; He, Z H (Zhongshan U.) ; Heil, M (MIT ; Karlsruhe U., EKP) ; Henning, R (MIT) ; Hoffman, J (Taiwan, Natl. Central U.) ; Hsieh, T H (MIT) ; Huang, Z C (Zhongshan U.) ; Huh, C (Kyungpook Natl. U., Daegu (Main) ; CHEP, Taegu) ; Incagli, M (INFN, Pisa) ; Ionica, M (INFN, Perugia) ; Jang, W Y (Kyungpook Natl. U., Daegu (Main) ; CHEP, Taegu) ; Jinchi, H (CSIST, Taiwan) ; Kanishev, K (INFN, Trento ; Trento U.) ; Kim, G N (Kyungpook Natl. U., Daegu (Main) ; CHEP, Taegu) ; Kim, K S (Kyungpook Natl. U., Daegu (Main) ; CHEP, Taegu) ; Kirn, Th (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Kossakowski, R (Annecy, LAPP ; Savoie U. (main)) ; Kounina, O (MIT) ; Kounine, A (MIT) ; Koutsenko, V (MIT) ; Krafczyk, M S (MIT) ; Kunz, S (Karlsruhe U., EKP) ; La Vacca, G (CERN ; INFN, Milan Bicocca) ; Laudi, E (INFN, Perugia ; U. Perugia (main)) ; Laurenti, G (INFN, Bologna ; U. Bologna (main)) ; Lazzizzera, I (INFN, Trento ; Trento U.) ; Lebedev, A (MIT) ; Lee, H T (Taiwan, Inst. Phys.) ; Lee, S C (Taiwan, Inst. Phys.) ; Leluc, C (Geneva U.) ; Levi, G (INFN, Bologna ; U. Bologna (main)) ; Li, H L (Taiwan, Inst. Phys. ; Shandong U. ; China Scholarship Council) ; Li, J Q (Southeast U., Nanjing) ; Li, Q (Southeast U., Nanjing) ; Li, Q (MIT ; Harbin Inst. Tech. ; China Scholarship Council) ; Li, T X (Zhongshan U.) ; Li, W (BeiHang U.) ; Li, Y (Geneva U. ; SYSU, Guangzhou ; China Scholarship Council) ; Li, Z H (Beijing, Inst. High Energy Phys.) ; Li, Z Y (Taiwan, Inst. Phys. ; SYSU, Guangzhou ; China Scholarship Council) ; Lim, S (Ewha Women's U., Seoul) ; Lin, C H (Taiwan, Inst. Phys.) ; Lipari, P (INFN, Rome) ; Lippert, T (Julich, NIC ; JARA-FAME, Jülich) ; Liu, D (Taiwan, Inst. Phys.) ; Liu, H (Southeast U., Nanjing) ; Lolli, M (INFN, Bologna ; U. Bologna (main)) ; Lomtadze, T (INFN, Pisa) ; Lu, M J (Annecy, LAPP ; Savoie U. (main) ; Hefei, CUST ; China Scholarship Council) ; Lu, Y S (Beijing, Inst. High Energy Phys.) ; Luebelsmeyer, K (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Luo, F (Shandong U.) ; Luo, J Z (Southeast U., Nanjing) ; Lv, S S (Zhongshan U.) ; Majka, R (Yale U.) ; Malinin, A (Maryland U., College Park) ; Mañá, C (Madrid, CIEMAT) ; Marín, J (Madrid, CIEMAT) ; Martin, T (NASA, Houston ; Jacobs-Sverdrup, Houston) ; Martínez, G (Madrid, CIEMAT) ; Masi, N (INFN, Bologna ; U. Bologna (main)) ; Massera, F (INFN, Bologna ; U. Bologna (main)) ; Maurin, D (LPSC, Grenoble) ; Menchaca-Rocha, A (Mexico U.) ; Meng, Q (Southeast U., Nanjing) ; Mo, D C (Zhongshan U.) ; Monreal, B (MIT) ; Morescalchi, L (INFN, Pisa ; U. Siena (main)) ; Mott, P (NASA, Houston ; Jacobs-Sverdrup, Houston) ; Müller, M (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Ni, J Q (Zhongshan U.) ; Nikonov, N (Karlsruhe U., EKP) ; Nozzoli, F (INFN, Perugia) ; Nunes, P (LIP, Lisbon) ; Obermeier, A (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Oliva, A (Madrid, CIEMAT) ; Orcinha, M (LIP, Lisbon) ; Palmonari, F (INFN, Bologna ; U. Bologna (main)) ; Palomares, C (Madrid, CIEMAT) ; Paniccia, M (Geneva U.) ; Papi, A (INFN, Perugia) ; Pauluzzi, M (INFN, Perugia ; U. Perugia (main)) ; Pedreschi, E (INFN, Pisa) ; Pensotti, S (INFN, Milan Bicocca ; Milan Bicocca U.) ; Pereira, R (Hawaii U. ; LIP, Lisbon) ; Pilastrini, R (INFN, Bologna ; U. Bologna (main)) ; Pilo, F (INFN, Pisa) ; Piluso, A (INFN, Perugia ; U. Perugia (main)) ; Pizzolotto, C (INFN, Perugia) ; Plyaskin, V (MIT) ; Pohl, M (Geneva U.) ; Poireau, V (Annecy, LAPP ; Savoie U. (main)) ; Postaci, E (Middle East Tech. U., Ankara) ; Putze, A (Annecy, LAPP ; Savoie U. (main)) ; Quadrani, L (INFN, Bologna ; U. Bologna (main)) ; Qi, X M (Zhongshan U.) ; Rancoita, P G (INFN, Milan Bicocca) ; Rapin, D (Geneva U.) ; Ricol, J S (LPSC, Grenoble) ; Rodríguez, I (Madrid, CIEMAT) ; Rosier-Lees, S (Annecy, LAPP ; Savoie U. (main)) ; Rossi, L (CERN) ; Rozhkov, A (MIT) ; Rozza, D (INFN, Milan Bicocca) ; Rybka, G (MIT) ; Sagdeev, R (Maryland U., College Park) ; Sandweiss, J (Yale U.) ; Saouter, P (Geneva U.) ; Sbarra, C (INFN, Bologna ; U. Bologna (main)) ; Schael, S (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Schmidt, S M (Julich, NIC ; JARA-FAME, Jülich) ; Schuckardt, D (Karlsruhe U., EKP) ; Schulz von Dratzig, A (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Schwering, G (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Scolieri, G (INFN, Perugia) ; Seo, E S (Maryland U., College Park) ; Shan, B S (BeiHang U.) ; Shan, Y H (BeiHang U.) ; Shi, J Y (Southeast U., Nanjing) ; Shi, X Y (MIT ; Beijing Normal U. ; China Scholarship Council) ; Shi, Y M (Shanghai Jiaotong U.) ; Siedenburg, T (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Son, D (Kyungpook Natl. U., Daegu (Main) ; CHEP, Taegu) ; Spada, F (INFN, Rome) ; Spinella, F (INFN, Pisa) ; Sun, W (MIT) ; Sun, W H (MIT ; Southeast U., Nanjing ; China Scholarship Council) ; Tacconi, M (INFN, Milan Bicocca ; Milan Bicocca U.) ; Tang, C P (Zhongshan U.) ; Tang, X W (Beijing, Inst. High Energy Phys.) ; Tang, Z C (Beijing, Inst. High Energy Phys.) ; Tao, L (Annecy, LAPP ; Savoie U. (main)) ; Tescaro, D (IAC, La Laguna) ; Ting, Samuel C C (MIT) ; Ting, S M (MIT) ; Tomassetti, N (LPSC, Grenoble) ; Torsti, J (Turku U.) ; Türkoğlu, C (Middle East Tech. U., Ankara) ; Urban, T (NASA, Houston ; Jacobs-Sverdrup, Houston) ; Vagelli, V (Karlsruhe U., EKP) ; Valente, E (INFN, Rome ; U. Rome La Sapienza (main)) ; Vannini, C (INFN, Pisa) ; Valtonen, E (Turku U.) ; Vaurynovich, S (MIT) ; Vecchi, M (Annecy, LAPP ; Savoie U. (main)) ; Velasco, M (Madrid, CIEMAT) ; Vialle, J P (Annecy, LAPP ; Savoie U. (main)) ; Vitale, V (INFN, Perugia) ; Volpini, G (INFN, Milan ; Milan U.) ; Wang, L Q (Shandong U.) ; Wang, Q L (Inst. Electr. Engin., Beijing) ; Wang, R S (Shanghai Jiaotong U.) ; Wang, X (MIT) ; Wang, Z X (Zhongshan U.) ; Weng, Z L (MIT) ; Whitman, K (Hawaii U.) ; Wienkenhöver, J (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Wu, H (Southeast U., Nanjing) ; Wu, K Y (Taiwan, Inst. Phys.) ; Xia, X (Madrid, CIEMAT ; Shandong U. ; China Scholarship Council) ; Xie, M (MIT ; Harbin Inst. Tech. ; China Scholarship Council) ; Xie, S (Shanghai Jiaotong U.) ; Xiong, R Q (Southeast U., Nanjing) ; Xin, G M (Shandong U.) ; Xu, N S (Zhongshan U.) ; Xu, W (Beijing, Inst. High Energy Phys. ; MIT) ; Yan, Q (Beijing, Inst. High Energy Phys.) ; Yang, J (Ewha Women's U., Seoul) ; Yang, M (Beijing, Inst. High Energy Phys.) ; Ye, Q H (Shanghai Jiaotong U.) ; Yi, H (Southeast U., Nanjing) ; Yu, Y J (Inst. Electr. Engin., Beijing) ; Yu, Z Q (Beijing, Inst. High Energy Phys.) ; Zeissler, S (Karlsruhe U., EKP) ; Zhang, J H (Southeast U., Nanjing) ; Zhang, M T (Zhongshan U.) ; Zhang, X B (Zhongshan U.) ; Zhang, Z (Zhongshan U.) ; Zheng, Z M (BeiHang U.) ; Zhou, F (MIT) ; Zhuang, H L (Beijing, Inst. High Energy Phys.) ; Zhukov, V (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Zichichi, A (INFN, Bologna ; U. Bologna (main)) ; Zimmermann, N (Aachen, Tech. Hochsch. ; JARA-FAME, Aachen) ; Zuccon, P (MIT) ; Zurbach, C (U. Montpellier 2, LUPM)

Publication 2014
In: Phys. Rev. Lett. 113 (2014) 121101
DOI 10.1103/PhysRevLett.113.121101
Subject category Particle Physics - Experiment ; Astrophysics and Astronomy
Accelerator/Facility, Experiment AMS RE1
Abstract 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.

Corresponding record in: Inspire


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