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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

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 s...

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Detalles Bibliográficos
Autores principales: Accardo, L, Aguilar, M, Aisa, D, Alpat, B, Alvino, A, Ambrosi, G, Andeen, K, Arruda, L, Attig, N, Azzarello, P, Bachlechner, A, Barao, F, Barrau, A, Barrin, L, Bartoloni, A, Basara, L, Battarbee, M, Battiston, R, Bazo, J, Becker, U, Behlmann, M, Beischer, B, Berdugo, J, Bertucci, B, Bigongiari, G, Bindi, V, Bizzaglia, S, Bizzarri, M, Boella, G, de Boer, W, Bollweg, K, Bonnivard, V, Borgia, B, Borsini, S, Boschini, M J, Bourquin, M, Burger, J, Cadoux, F, Cai, X D, Capell, M, Caroff, S, Carosi, G, Casaus, J, Cascioli, V, Castellini, G, Cernuda, I, Cerreta, D, Cervelli, F, Chae, M J, Chang, Y H, Chen, A I, Chen, H, Cheng, G M, Chen, H S, Cheng, L, Chikanian, A, Chou, H Y, Choumilov, E, Choutko, V, Chung, C H, Cindolo, F, Clark, C, Clavero, R, Coignet, G, Consolandi, C, Contin, A, Corti, C, Coste, B, Cui, Z, Dai, M, Delgado, C, Della Torre, S, Demirköz, M B, Derome, L, Di Falco, S, Di Masso, L, Dimiccoli, F, Díaz, C, von Doetinchem, P, Du, W J, Duranti, M, D’Urso, D, Eline, A, Eppling, F J, Eronen, T, Fan, Y Y, Farnesini, L, Feng, J, Fiandrini, E, Fiasson, A, Finch, E, Fisher, P, Galaktionov, Y, Gallucci, G, García, B, García-López, R, Gast, H, Gebauer, I, Gervasi, M, Ghelfi, A, Gillard, W, Giovacchini, F, Goglov, P, Gong, J, Goy, C, Grabski, V, Grandi, D, Graziani, M, Guandalini, C, Guerri, I, Guo, K H, Haas, D, Habiby, M, Haino, S, Han, K C, He, Z H, Heil, M, Henning, R, Hoffman, J, Hsieh, T H, Huang, Z C, Huh, C, Incagli, M, Ionica, M, Jang, W Y, Jinchi, H, Kanishev, K, Kim, G N, Kim, K S, Kirn, Th, Kossakowski, R, Kounina, O, Kounine, A, Koutsenko, V, Krafczyk, M S, Kunz, S, La Vacca, G, Laudi, E, Laurenti, G, Lazzizzera, I, Lebedev, A, Lee, H T, Lee, S C, Leluc, C, Levi, G, Li, H L, Li, J Q, Li, Q, Li, T X, Li, W, Li, Y, Li, Z H, Li, Z Y, Lim, S, Lin, C H, Lipari, P, Lippert, T, Liu, D, Liu, H, Lolli, M, Lomtadze, T, Lu, M J, Lu, Y S, Luebelsmeyer, K, Luo, F, Luo, J Z, Lv, S S, Majka, R, Malinin, A, Mañá, C, Marín, J, Martin, T, Martínez, G, Masi, N, Massera, F, Maurin, D, Menchaca-Rocha, A, Meng, Q, Mo, D C, Monreal, B, Morescalchi, L, Mott, P, Müller, M, Ni, J Q, Nikonov, N, Nozzoli, F, Nunes, P, Obermeier, A, Oliva, A, Orcinha, M, Palmonari, F, Palomares, C, Paniccia, M, Papi, A, Pauluzzi, M, Pedreschi, E, Pensotti, S, Pereira, R, Pilastrini, R, Pilo, F, Piluso, A, Pizzolotto, C, Plyaskin, V, Pohl, M, Poireau, V, Postaci, E, Putze, A, Quadrani, L, Qi, X M, Rancoita, P G, Rapin, D, Ricol, J S, Rodríguez, I, Rosier-Lees, S, Rossi, L, Rozhkov, A, Rozza, D, Rybka, G, Sagdeev, R, Sandweiss, J, Saouter, P, Sbarra, C, Schael, S, Schmidt, S M, Schuckardt, D, Schulz von Dratzig, A, Schwering, G, Scolieri, G, Seo, E S, Shan, B S, Shan, Y H, Shi, J Y, Shi, X Y, Shi, Y M, Siedenburg, T, Son, D, Spada, F, Spinella, F, Sun, W, Sun, W H, Tacconi, M, Tang, C P, Tang, X W, Tang, Z C, Tao, L, Tescaro, D, Ting, Samuel C C, Ting, S M, Tomassetti, N, Torsti, J, Türkoğlu, C, Urban, T, Vagelli, V, Valente, E, Vannini, C, Valtonen, E, Vaurynovich, S, Vecchi, M, Velasco, M, Vialle, J P, Vitale, V, Volpini, G, Wang, L Q, Wang, Q L, Wang, R S, Wang, X, Wang, Z X, Weng, Z L, Whitman, K, Wienkenhöver, J, Wu, H, Wu, K Y, Xia, X, Xie, M, Xie, S, Xiong, R Q, Xin, G M, Xu, N S, Xu, W, Yan, Q, Yang, J, Yang, M, Ye, Q H, Yi, H, Yu, Y J, Yu, Z Q, Zeissler, S, Zhang, J H, Zhang, M T, Zhang, X B, Zhang, Z, Zheng, Z M, Zhou, F, Zhuang, H L, Zhukov, V, Zichichi, A, Zimmermann, N, Zuccon, P, Zurbach, C
Lenguaje:eng
Publicado: 2014
Materias:
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.113.121101
http://cds.cern.ch/record/1756484
Descripción
Sumario: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.