doi: 10.1103/PhysRevLett.110.141102. Epub 2013 Apr 3.
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
M Aguilar 1, G Alberti 2, B Alpat 3, A Alvino 2, G Ambrosi 3, K Andeen 4, H Anderhub 5, L Arruda 6, P Azzarello 7, A Bachlechner 8, F Barao 6, B Baret 9, A Barrau 9, L Barrin 10, A Bartoloni 11, L Basara 12, A Basili 13, L Batalha 6, J Bates 14, R Battiston 15, J Bazo 3, R Becker 13, U Becker 13, M Behlmann 13, B Beischer 8, J Berdugo 16, P Berges 13, B Bertucci 2, G Bigongiari 17, A Biland 5, V Bindi 18, S Bizzaglia 3, G Boella 19, W de Boer 4, K Bollweg 14, J Bolmont 20, B Borgia 21, S Borsini 2, M J Boschini 22, G Boudoul 9, M Bourquin 23, P Brun 12, M Buénerd 9, J Burger 13, W Burger 24, F Cadoux 25, X D Cai 13, M Capell 13, D Casadei 26, J Casaus 16, V Cascioli 2, G Castellini 27, I Cernuda 16, F Cervelli 28, M J Chae 29, Y H Chang 30, A I Chen 13, C R Chen 31, H Chen 13, G M Cheng 32, H S Chen 32, L Cheng 33, N Chernoplyiokov 34, A Chikanian 35, E Choumilov 13, V Choutko 13, C H Chung 8, C Clark 14, R Clavero 36, G Coignet 12, V Commichau 5, C Consolandi 37, A Contin 26, C Corti 18, M T Costado Dios 36, B Coste 9, D Crespo 16, Z Cui 33, M Dai 38, C Delgado 16, S Della Torre 19, B Demirkoz 39, P Dennett 13, L Derome 9, S Di Falco 28, X H Diao 40, A Diago 36, L Djambazov 5, C Díaz 16, P von Doetinchem 8, W J Du 33, J M Dubois 12, R Duperay 9, M Duranti 2, D D'Urso 41, A Egorov 13, A Eline 13, F J Eppling 13, T Eronen 42, J van Es 43, H Esser 8, A Falvard 20, E Fiandrini 2, A Fiasson 12, E Finch 35, P Fisher 13, K Flood 13, R Foglio 9, M Fohey 14, S Fopp 8, N Fouque 12, Y Galaktionov 13, M Gallilee 13, L Gallin-Martel 9, G Gallucci 28, B García 16, J García 16, R García-López 36, L García-Tabares 16, C Gargiulo 44, H Gast 8, I Gebauer 4, S Gentile 21, M Gervasi 19, W Gillard 9, F Giovacchini 16, L Girard 12, P Goglov 13, J Gong 45, C Goy-Henningsen 12, D Grandi 22, M Graziani 2, A Grechko 34, A Gross 8, I Guerri 17, C de la Guía 16, K H Guo 40, M Habiby 23, S Haino 46, F Hauler 4, Z H He 40, M Heil 4, J Heilig 14, R Hermel 12, H Hofer 5, Z C Huang 40, W Hungerford 47, M Incagli 48, M Ionica 2, A Jacholkowska 20, W Y Jang 49, H Jinchi 50, M Jongmanns 5, L Journet 12, L Jungermann 4, W Karpinski 8, G N Kim 49, K S Kim 49, Th Kirn 8, R Kossakowski 12, A Koulemzine 13, O Kounina 13, A Kounine 13, V Koutsenko 13, M S Krafczyk 13, E Laudi 2, G Laurenti 51, C Lauritzen 14, A Lebedev 13, M W Lee 49, S C Lee 52, C Leluc 23, H León Vargas 53, V Lepareur 12, J Q Li 45, Q Li 45, T X Li 40, W Li 54, Z H Li 32, P Lipari 11, C H Lin 52, D Liu 52, H Liu 45, T Lomtadze 28, Y S Lu 32, S Lucidi 3, K Lübelsmeyer 8, J Z Luo 45, W Lustermann 5, S Lv 40, J Madsen 55, R Majka 35, A Malinin 56, C Mañá 16, J Marín 16, T Martin 14, G Martínez 16, F Masciocchi 23, N Masi 26, D Maurin 9, A McInturff 57, P McIntyre 57, A Menchaca-Rocha 53, Q Meng 45, M Menichelli 3, I Mereu 2, M Millinger 8, D C Mo 40, M Molina 58, P Mott 14, A Mujunen 59, S Natale 60, P Nemeth 14, J Q Ni 40, N Nikonov 4, F Nozzoli 61, P Nunes 6, A Obermeier 4, S Oh 29, A Oliva 62, F Palmonari 26, C Palomares 16, M Paniccia 25, A Papi 3, W H Park 49, M Pauluzzi 2, F Pauss 5, A Pauw 43, E Pedreschi 28, S Pensotti 19, R Pereira 6, E Perrin 23, G Pessina 19, G Pierschel 8, F Pilo 28, A Piluso 2, C Pizzolotto 61, V Plyaskin 13, J Pochon 63, M Pohl 23, V Poireau 12, S Porter 14, J Pouxe 9, A Putze 8, L Quadrani 26, X N Qi 40, P G Rancoita 22, D Rapin 23, Z L Ren 52, J S Ricol 9, E Riihonen 42, I Rodríguez 16, U Roeser 5, S Rosier-Lees 12, L Rossi 64, A Rozhkov 13, D Rozza 65, A Sabellek 4, R Sagdeev 66, J Sandweiss 35, B Santos 6, P Saouter 23, M Sarchioni 3, S Schael 8, D Schinzel 13, M Schmanau 4, G Schwering 8, A Schulz von Dratzig 8, G Scolieri 3, E S Seo 56, B S Shan 54, J Y Shi 45, Y M Shi 67, T Siedenburg 8, R Siedling 8, D Son 49, F Spada 11, F Spinella 28, M Steuer 13, K Stiff 57, W Sun 13, W H Sun 45, X H Sun 40, M Tacconi 19, C P Tang 40, X W Tang 32, Z C Tang 32, L Tao 12, J Tassan-Viol 12, Samuel C C Ting 13, S M Ting 13, C Titus 13, N Tomassetti 2, F Toral 16, J Torsti 42, J R Tsai 31, J C Tutt 14, J Ulbricht 5, T Urban 14, V Vagelli 4, E Valente 11, C Vannini 28, E Valtonen 42, M Vargas Trevino 9, S Vaurynovich 13, M Vecchi 30, M Vergain 13, B Verlaat 68, C Vescovi 9, J P Vialle 12, G Viertel 5, G Volpini 69, D Wang 31, N H Wang 33, Q L Wang 38, R S Wang 67, X Wang 13, Z X Wang 40, W Wallraff 8, Z L Weng 70, M Willenbrock 13, M Wlochal 8, H Wu 45, K Y Wu 71, Z S Wu 40, W J Xiao 40, S Xie 67, R Q Xiong 45, G M Xin 33, N S Xu 40, W Xu 32, Q Yan 32, J Yang 29, M Yang 32, Q H Ye 67, H Yi 45, Y J Yu 38, Z Q Yu 32, S Zeissler 4, J G Zhang 45, Z Zhang 40, M M Zhang 40, Z M Zheng 54, H L Zhuang 32, V Zhukov 8, A Zichichi 26, P Zuccon 72, C Zurbach 20; AMS Collaboration
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- PMID:25166975
- DOI: 10.1103/PhysRevLett.110.141102
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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
M Aguilar et al. Phys Rev Lett..
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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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