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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
Authors
L. Accardo,M. Aguilar
D. Aisa,B. Alpat,A. Alvino,G. Ambrosi,K. Andeen,L. Arruda,N. Attig,P. Azzarello,A. Bachlechner,F. Barão,Aurélien Barrau,L. Barrin,C. Baty,L. Basara,Markus Battarbee,R. Battiston,I. Bearden,U. Becker,M. Behlmann,B. Beischer,J. Berdugo,B. Bertucci,G. Bigongiari,V. Bindi,C. Cecchi,M. Bizzarri,G. Boella,W. Boer,K. Bollweg,V. Bonnivard,L. Taylor,S. Borsini,M. Boschini,J.D. Burger,F. Cadoux,Xudong Cai,M. Capell,S. Caroff,G. Carosi,J. Casaus,Vincenzo Cascioli,G. Castellini,I. Cernuda,D. Cerreta,F. Cervelli,M. Chae,Yuan-Hann Chang,A. Chen,H. Chen,Cheng Gong,H Chen,Lin Cheng,A. Chikanian,H. Chou,E. Choumilov,Vitali Choutko,C. Chung,F. Cindolo,C. Clark,R. Clavero,G. Coignet,C. Consolandi,A. Contin,C. Corti,Benoît Coste,Zheng Cui,Min Dai,C. Mendez,S. Torre,B. Demirköz,L. Derome,S. Falco,L. Masso,F. Dimiccoli,C. Díaz,P. Doetinchem,Wenjing Du,M. Duranti,D. D’Urso,A. Eline,F.J. Eppling,T. Eronen,Yi-Zhong Fan,L. Farnesini,J. Feng,E. Fiandrini,A. Fiaßon,E. Finch,W. Fisher,Yu. Galaktionov,G. Gallucci,H. Gemmeke,R. López,H. Gast,Iris Gebauer,M. Gervasi,A. Ghelfi,W. Gillard,F. Giovacchini,P. Goglov,J. Gong,C. Goy,Varlen Grabski,D. Grandi,M. Graziani,C. Guandalini,I. Guerri,Kexin Guo,C. Luci,M. Habiby,S. Haino,K. Han,Z. He,M. Heil,R. Henning,J. Hoffman,Timothy Hsieh,Z. Huang,C. Huh,M. Incagli,M. Ionica,W. Jang,H. Jinchi,K. Kanishev,C. Moon,K Kim,Th. Kirn,R. Kossakowski,O. Kounina,A. Kounine,V. Koutsenko,M. Krafczyk,Simon Kunz,G. Vacca,Elisa Laudi,G. Laurenti,I. Lazzizzera,A. Lebedev,H. Lee,Z. Lawrence,C. Leluc,G. Lévi,Huanhuan Li,J Li,Q. Li,T. Li,Wei Li,Y. Li,Z Li,Soobin Lim,Chao‐Hung Lin,P. Lipari,Thomas Lippert,D. Liu,H. Liu,M. Lolli,F. Palla,M. Lu,Yudong Lu,K. Luebelsmeyer,Feng Luo,Junzhou Luo,Serova Lv,M. Csanád,L. Malgeri,C. Mañá,Gustavo Martı́nez,N. Masi,F. Massera,D. Maurin,A. Menchaca-Rocha,Qiao Meng,L. Morescalchi,B. Monreal,P. Mott,M. Müller,N. Nikonov,F. Nozzoli,Pedro Nunes,Andreas Obermeier,A. Oliva,M. Orcinha,F. Palmonari,H. Nowak,M. Paniccia,Alberto Papi,G. Passaleva,E. Pedreschi,S. Pensotti,R. Pilastrini,F. Pilo,A. Piluso,C. Pizzolotto,V. Plyaskin,M. Pohl,B. Rudak,E. Postaci,L. Quadrani,X. Qi,P.G. Rancoita,D. Rapin,J. Ricol,I. Rodríguez,A. Rubbia,L. Rossi,D. Rozza,G. Rybka,R. Sagdeev,J. Sandweiss,P. Saouter,V. Savinov,S. Schael,Sebastian Schmidt,D. Schuckardt,A. Dratzig,E. Seo,G. Scolieri,B. Shan,Y. Shan,J. Shi,Xiaofeng Shi,Ying Shi,A. Straessner,S. Choi,G. Spandre,F. Spinella,M. Tacconi,Chengpei Tang,Xiao Tang,Zhi-Cheng Tang,L. Tao,D. Tescaro,Samuel Ting,S.M. Ting,J. Torsti,V. Vagelli,E. Valente,G. Tonelli,M. Acosta,S. Vaurynovich,P. Vernin,M. Velasco,J. Vialle,V. Vitale,S. Vlachos,L. Wang,Q Wang,R Wang,X. Wang,Zirun Wang,Z. Weng,Kathryn Whitman,J. Wienkenhöver,X. Wu,Kang Wu,X. Xia,Min Xie,S. Xie,W. Xu,Gongming Xin,N. Xu,M. Yang,Q. Ye,Han Yi,Yongji Yu,M. Zannoni,J Zhang,M. Zhang,X. Zhang,Z. Zhang,Z. Zheng,F. Zhou,H.L. Zhuang,P. Carniti,A. Zichichi,P. Zuccon,T. Zwitter,Wim Boer
+278 authors
,Lucas TaylorJournal
Published
Sep 18, 2014
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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.
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