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 x 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to similar 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. DOI: 10.1103/PhysRevLett.110.141102

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, Mj; Boudoul, G; Bourquin, M; Brun, P; Buenerd, M; Burger, J; Burger, W; Cadoux, F; Cai, Xd; Capell, M; Casadei, D; Casaus, J; Cascioli, V; Castellini, G; Cernuda, I; Cervelli, F; Chae, Mj; Chang, Yh; Chen, Ai; Chen, Cr; Chen, H; Cheng, Gm; Chen, Hs; Cheng, L; Chernoplyiokov, N; Chikanian, A; Choumilov, E; Choutko, V; Chung, Ch; Clark, C; Clavero, R; Coignet, G; Commichau, V; Consolandi, C; Contin, A; Corti, C; Dios, Mtc; Coste, B; Crespo, D; Cui, Z; Dai, M; Delgado, C; Della Torre, S; Demirkoz, B; Dennett, P; Derome, L; Di Falco, S; Diao, Xh; Diago, A; Djambazov, L; Diaz, C; von Doetinchem, P; Du, Wj; Dubois, Jm; Duperay, R; Duranti, M; D'Urso, D; Egorov, A; Eline, A; Eppling, Fj; 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; Garcia, B; Garcia, J; Garcia-Lopez, R; Garcia-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 Guia, C; Guo, Kh; Habiby, M; Haino, S; Hauler, F; He, Zh; Heil, M; Heilig, J; Hermel, R; Hofer, H; Huang, Zc; Hungerford, W; Incagli, M; Ionica, M; Jacholkowska, A; Jang, Wy; Jinchi, H; Jongmanns, M; Journet, L; Jungermann, L; Karpinski, W; Kim, Gn; Kim, Ks; Kirn, T; Kossakowski, R; Koulemzine, A; Kounina, O; Kounine, A; Koutsenko, V; Krafczyk, Ms; Laudi, E; Laurenti, G; Lauritzen, C; Lebedev, A; Lee, Mw; Lee, Sc; Leluc, C; Vargas, Hl; Lepareur, V; Li, Jq; Li, Q; Li, Tx; Li, W; Li, Zh; Lipari, P; Lin, Ch; Liu, D; Liu, H; Lomtadze, T; Lu, Ys; Lucidi, S; Lubelsmeyer, K; Luo, Jz; Lustermann, W; Lv, S; Madsen, J; Majka, R; Malinin, A; Mana, C; Marin, J; Martin, T; Martinez, G; Masciocchi, F; Masi, N; Maurin, D; Mcinturff, A; Mcintyre, P; Menchaca-Rocha, A; Meng, Q; Menichelli, M; Mereu, I; Millinger, M; Mo, Dc; Molina, M; Mott, P; Mujunen, A; Natale, S; Nemeth, P; Ni, Jq; Nikonov, N; Nozzoli, F; Nunes, P; Obermeier, A; Oh, S; Oliva, A; Palmonari, F; Palomares, C; Paniccia, M; Papi, A; Park, Wh; 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, Xn; Rancoita, Pg; Rapin, D; Ren, Zl; Ricol, Js; Riihonen, E; Rodriguez, 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; von Dratzig, As; Scolieri, G; Seo, Es; Shan, Bs; Shi, Jy; Shi, Ym; Siedenburg, T; Siedling, R; Son, D; Spada, F; Spinella, F; Steuer, M; Stiff, K; Sun, W; Sun, Wh; Sun, Xh; Tacconi, M; Tang, Cp; Tang, Xw; Tang, Zc; Tao, L; Tassan-Viol, J; Ting, Scc; Ting, Sm; Titus, C; Tomassetti, N; Toral, F; Torsti, J; Tsai, Jr; Tutt, Jc; Ulbricht, J; Urban, T; Vagelli, V; Valente, E; Vannini, C; Valtonen, E; Trevino, Mv; Vaurynovich, S; Vecchi, M; Vergain, M; Verlaat, B; Vescovi, C; Vialle, Jp; Viertel, G; Volpini, G; Wang, D; Wang, Nh; Wang, Ql; Wang, Rs; Wang, X; Wang, Zx; Wallraff, W; Weng, Zl; Willenbrock, M; Wlochal, M; Wu, H; Wu, Ky; Wu, Zs; Xiao, Wj; Xie, S; Xiong, Rq; Xin, Gm; Xu, Ns; Xu, W; Yan, Q; Yang, J; Yang, M; Ye, Qh; Yi, H; Yu, Yj; Yu, Zq; Zeissler, S; Zhang, Jg; Zhang, Z; Zhang, Mm; Zheng, Zm; Zhuang, Hl; Zhukov, V; Zichichi, A; Zuccon, P; Zurbach, C. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 110:14(2013). [10.1103/PhysRevLett.110.141102]

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

D'Urso D;Rozza D;
2013

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 x 10(6) positron and electron events is presented. The very accurate data show that the positron fraction is steadily increasing from 10 to similar 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. DOI: 10.1103/PhysRevLett.110.141102
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11388/212154
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 954
  • ???jsp.display-item.citation.isi??? 772
social impact