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First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5–350 GeV
Authors
M. Aguilar,G. Alberti
B. Alpat,A. Alvino,G. Ambrosi,K. Andeen,H. Anderhub,L. Arruda,P. Azzarello,A. Bachlechner,F. Barão,B. Baret,Aurélien Barrau,L. Barrin,C. Baty,L. Basara,A. Basili,L. Batalha,J. Bates,R. Battiston,I. Bearden,R. Becker,U. Becker,M. Behlmann,B. Beischer,J. Berdugo,L. Taylor,B. Bertucci,G. Bigongiari,A. Biland,V. Bindi,C. Cecchi,G. Boella,W. Boer,K. Bollweg,J. Bolmont,S. Borsini,M. Boschini,G. Boudoul,T. Bulik,M. Buénerd,J.D. Burger,W. Burger,F. Cadoux,Xudong Cai,M. Capell,D. Casadei,J. Casaus,Vincenzo Cascioli,G. Castellini,I. Cernuda,F. Cervelli,M. Chae,Yuan-Hann Chang,A. Chen,C. Chen,H. Chen,Cheng Gong,H Chen,Lin Cheng,N. Chernoplyiokov,A. Chikanian,E. Choumilov,V. Choutko,C. Chung,C. Clark,R. Clavero,G. Coignet,V. Commichau,C. Consolandi,A. Contin,C. Corti,M. Costado,Benoît Coste,D. Crespo,Z. Cui,Min Dai,C. Mendez,S. Torre,B. Demirköz,P. Dennett,L. Derome,S. Falco,Xinyue Diao,A. Diago,L. Djambazov,C. Díaz,P. Doetinchem,Wenjing Du,Jean Dubois,R. Duperay,M. Duranti,D. D’Urso,A. Egorov,A. Eline,F.J. Eppling,T. Eronen,J. Es,H. Esser,A. Falvard,E. Fiandrini,A. Fiaßon,E. Finch,W. Fisher,K. Flood,R. Foglio,M. Fohey,S. Fopp,N. Fouque,Yu. Galaktionov,M. Gallilee,L. Gallin-Martel,G. Gallucci,H. Gemmeke,Jorge-Armando Garcia,R. López,L. García‐Tabarés,Corrado Gargiulo,H. Gast,Iris Gebauer,J. Saraiva,M. Gervasi,W. Gillard,F. Giovacchini,M. Drinkwater,P. Goglov,J. Gong,C. Goy-Henningsen,D. Grandi,M. Graziani,A. Grechko,A. Groß,I. Guerri,C. Guía,Kexin Guo,M. Habiby,S. Haino,F. Hauler,Z. He,M. Heil,J. Heilig,R. Hermel,H. Höfer,Z. Huang,W. Hungerford,M. Incagli,M. Ionica,A. Jachołkowska,W. Jang,H. Jinchi,M. Jongmanns,Laure Journet,L. Jungermann,W. Karpiński,G. Kim,K Kim,Th. Kirn,R. Kossakowski,A. Koulemzine,O. Kounina,A. Kounine,V. Koutsenko,M. Krafczyk,Elisa Laudi,G. Laurenti,C. Lauritzen,A. Lebedev,M. Lee,S. Lee,C. Leluc,H. Vargas,V. Lepareur,J. Li,Q. Li,T Li,W. Li,Z Li,P. Lipari,Chao‐Hung Lin,Dongdong Liu,Huamei Liu,F. Palla,Yudong Lu,S. Lucidi,C. Luci,Junzhou Luo,C. Mackay,Serova Lv,Jim Madsen,M. Csanád,L. Malgeri,C. Mañá,Gustavo Martı́nez,F. Masciocchi,N. Masi,D. Maurin,A.D. McInturff,K. McFarland,A. Menchaca-Rocha,Q. Meng,M. Menichelli,I. Mereu,Mark Millinger,L. Morescalchi,Marco Molina,P. Mott,Ari Mujunen,Sonia Natale,Péter Németh,N. Nikonov,F. Nozzoli,Pedro Nunes,Andreas Obermeier,S. Oh,A. Oliva,F. Palmonari,H. Nowak,M. Paniccia,Alberto Papi,W. Park,G. Passaleva,F. Pauss,A. Pauw,E. Pedreschi,S. Pensotti,E. Perrin,G. Pessina,G. Pierschel,F. Pilo,A. Piluso,C. Pizzolotto,V. Plyaskin,J. Pochon,M. Pohl,V. Poireau,Scott Porter,J. Pouxe,L. Quadrani,X. Qi,P.G. Rancoita,D. Rapin,Zhiyuan Ren,J. Ricol,E. Riihonen,I. Rodríguez,U. Roeser,Gavin Rowell,L. Rossi,D. Rozza,A. Sabellek,R. Sagdeev,J. Sandweiss,B. Santos,P. Saouter,M. Sarchioni,S. Schael,D. Schinzel,M. Schmanau,E. Seo,A. Dratzig,G. Scolieri,B. Shan,J. Shi,Ying Shi,A. Straessner,R. Siedling,P. Sopicki,G. Spandre,F. Spinella,M. Steuer,Kerry Stiff,M. Tacconi,X. Sun,Chengpei Tang,Xiao Tang,Zhi-Cheng Tang,L. Tao,Jean Tassan-Viol,Samuel Ting,S.M. Ting,Christine Titus,F. Toral,J. Torsti,Jaime Tsai,J. Tutt,S. Vlachos,V. Vagelli,E. Valente,G. Tonelli,M. Acosta,Marciano Vargas-Treviño,S. Vaurynovich,P. Vernin,M. Vergain,B. Verlaat,C. Vescovi,J. Vialle,D. Wang,N. Wang,Qiuliang Wang,R Wang,Xuan Wang,Z Wang,Meng Wang,Z. Weng,M. Willenbrock,M. Wlochal,X. Wu,Kang Wu,Z. Wu,Wenjia Xiao,S. Xie,W. Xu,Gongming Xin,N. Xu,M. Yang,Min Yang,Q. Ye,Han Yi,Yongji Yu,M. Zannoni,J. Zhang,Z. Zhang,M.-M. Zhang,Z. Zheng,H. Zhuang,P. Zuccon,A. Zichichi,T. Zwitter,Lucas Taylor,Wim Boer,Gaëlle Boudoul,Zhaoyuan Cui
+331 authors
,Vitaly SmirnovJournal
Published
Apr 3, 2013
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Abstract
A precision measurement by the Alpha Magnetic Spectrometer on the International Space Station of the positron fraction in primary cosmic rays in the energy range from 0.5 to 350 GeV based on 6.8 × 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to ∼ 250 GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude. The positron fraction spectrum shows no fine structure, and the positron to electron ratio shows no observable anisotropy. Together, these features show the existence of new physical phenomena.
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