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




Aguilar 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

2013

Physical Review Letters

Physical Review Letters

PRL

141102

14

110

14

10

0031-9007

DOIhttps://doi.org/10.1103/PhysRevLett.110.141102

http://api.elsevier.com/content/abstract/scopus_id:84876003828



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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