A1 Refereed original research article in a scientific journal

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




AuthorsAguilar M, Alberti G, Alpat B, Alvino A, Ambrosi G, Andeen K, Anderhub H, Arruda L, Azzarello P, Bachlechner A, Barao F, Baret B, Barrau A, Barrin L, Bartoloni A, Basara L, Basili A, Batalha L, Bates J, Battiston R, Bazo J, Becker R, Becker U, Behlmann M, Beischer B, Berdugo J, Berges P, Bertucci B, Bigongiari G, Biland A, Bindi V, Bizzaglia S, Boella G, De Boer W, Bollweg K, Bolmont J, Borgia B, Borsini S, Boschini M, Boudoul G, Bourquin M, Brun P, Buénerd M, Burger J, Burger W, Cadoux F, Cai X, Capell M, Casadei D, Casaus J, Cascioli V, Castellini G, Cernuda I, Cervelli F, Chae M, Chang Y, Chen A, Chen C, Chen H, Cheng G, Chen H, Cheng L, Chernoplyiokov N, Chikanian A, Choumilov E, Choutko V, Chung C, Clark C, Clavero R, Coignet G, Commichau V, Consolandi C, Contin A, Corti C, Costado Dios M, Coste B, Crespo D, Cui Z, Dai M, Delgado C, Della Torre S, Demirkoz B, Dennett P, Derome L, Di Falco S, Diao X, Diago A, Djambazov L, Díaz C, Von Doetinchem P, Du W, Dubois J, Duperay R, Duranti M, D'Urso D, Egorov A, Eline A, Eppling F, Eronen T, Van Es J, Esser H, Falvard A, Fiandrini E, Fiasson A, Finch E, Fisher P, Flood K, Foglio R, Fohey M, Fopp S, Fouque N, Galaktionov Y, Gallilee M, Gallin-Martel L, Gallucci G, García B, García J, García-López R, García-Tabares L, Gargiulo C, Gast H, Gebauer I, Gentile S, Gervasi M, Gillard W, Giovacchini F, Girard L, Goglov P, Gong J, Goy-Henningsen C, Grandi D, Graziani M, Grechko A, Gross A, Guerri I, De La Guía C, Guo K, Habiby M, Haino S, Hauler F, He Z, Heil M, Heilig J, Hermel R, Hofer H, Huang Z, Hungerford W, Incagli M, Ionica M, Jacholkowska A, Jang W, Jinchi H, Jongmanns M, Journet L, Jungermann L, Karpinski W, Kim G, Kim K, Kirn T, Kossakowski R, Koulemzine A, Kounina O, Kounine A, Koutsenko V, Krafczyk M, Laudi E, Laurenti G, Lauritzen C, Lebedev A, Lee M, Lee S, Leluc C, León Vargas H, Lepareur V, Li J, Li Q, Li T, Li W, Li Z, Lipari P, Lin C, Liu D, Liu H, Lomtadze T, Lu Y, Lucidi S, Lübelsmeyer K, Luo J, Lustermann W, Lv S, Madsen J, Majka R, Malinin A, Mañá C, Marín J, Martin T, Martínez G, Masciocchi F, Masi N, Maurin D, McInturff A, McIntyre P, Menchaca-Rocha A, Meng Q, Menichelli M, Mereu I, Millinger M, Mo D, Molina M, Mott P, Mujunen A, Natale S, Nemeth P, Ni J, Nikonov N, Nozzoli F, Nunes P, Obermeier A, Oh S, Oliva A, Palmonari F, Palomares C, Paniccia M, Papi A, Park W, Pauluzzi M, Pauss F, Pauw A, Pedreschi E, Pensotti S, Pereira R, Perrin E, Pessina G, Pierschel G, Pilo F, Piluso A, Pizzolotto C, Plyaskin V, Pochon J, Pohl M, Poireau V, Porter S, Pouxe J, Putze A, Quadrani L, Qi X, Rancoita P, Rapin D, Ren Z, Ricol J, Riihonen E, Rodríguez I, Roeser U, Rosier-Lees S, Rossi L, Rozhkov A, Rozza D, Sabellek A, Sagdeev R, Sandweiss J, Santos B, Saouter P, Sarchioni M, Schael S, Schinzel D, Schmanau M, Schwering G, Schulz Von Dratzig A, Scolieri G, Seo E, Shan B, Shi J, Shi Y, Siedenburg T, Siedling R, Son D, Spada F, Spinella F, Steuer M, Stiff K, Sun W, Sun W, Sun X, Tacconi M, Tang C, Tang X, Tang Z, Tao L, Tassan-Viol J, Ting S, Ting S, Titus C, Tomassetti N, Toral F, Torsti J, Tsai J, Tutt J, Ulbricht J, Urban T, Vagelli V, Valente E, Vannini C, Valtonen E, Vargas Trevino M, Vaurynovich S, Vecchi M, Vergain M, Verlaat B, Vescovi C, Vialle J, Viertel G, Volpini G, Wang D, Wang N, Wang Q, Wang R, Wang X, Wang Z, Wallraff W, Weng Z, Willenbrock M, Wlochal M, Wu H, Wu K, Wu Z, Xiao W, Xie S, Xiong R, Xin G, Xu N, Xu W, Yan Q, Yang J, Yang M, Ye Q, Yi H, Yu Y, Yu Z, Zeissler S, Zhang J, Zhang Z, Zhang M, Zheng Z, Zhuang H, Zhukov V, Zichichi A, Zuccon P, Zurbach C

PublisherAmerican Physical Society

Publication year2013

JournalPhysical Review Letters

Journal name in sourcePhysical Review Letters

Journal acronymPRL

Article number141102

Number in series14

Volume110

Issue14

Number of pages10

ISSN0031-9007

DOIhttps://doi.org/10.1103/PhysRevLett.110.141102(external)

Web address http://api.elsevier.com/content/abstract/scopus_id:84876003828(external)


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 6.8×106 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. © 2013 American Physical Society.



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