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

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Date

2014-09-18

Author

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, Melahat Bilge
Derome, L.
Di Falco, S.
Di Masso, L.
Dimiccoli, F.
Diaz, 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.
Garcia, B.
Garcia-Lopez, 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, 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.
Mana, C.
Marin, J.
Martin, T.
Martinez, G.
Masi, N.
Massera, F.
Maurin, D.
Menchaca-Rocha, A.
Meng, Q.
Mo, D. C.
Monreal, B.
Morescalchi, L.
Mott, P.
Mueller, 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.
Rodriguez, 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.
von Dratzig, A. Schulz
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.
Tuerkoglu, 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.
Wienkenhoever, 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.

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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 similar to 200 GeV the positron fraction no longer exhibits an increase with energy.

URI

https://hdl.handle.net/11511/69001

Journal

PHYSICAL REVIEW LETTERS

DOI

https://doi.org/10.1103/physrevlett.113.121101

Collections

Department of Physics, Article

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Citation Formats

L. Accardo et al., “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,” PHYSICAL REVIEW LETTERS, pp. 0–0, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/69001.