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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*
  • , G. Alberti
  • , B. Alpat
  • , A. Alvino
  • , G. Ambrosi
  • , K. Andeen
  • , H. Anderhub
  • , L. Arruda
  • , P. Azzarello
  • , A. Bachlechner
  • , F. Barao
  • , B. Baret
  • , A. Barrau
  • , L. Barrin
  • , A. Bartoloni
  • , L. Basara
  • , A. Basili
  • , L. Batalha
  • , J. Bates
  • , R. Battiston
  • J. Bazo, R. Becker, U. Becker, M. Behlmann, B. Beischer, J. Berdugo, P. Berges, B. Bertucci, G. Bigongiari, A. Biland, V. Bindi, S. Bizzaglia, G. Boella, W. De Boer, K. Bollweg, J. Bolmont, B. Borgia, S. Borsini, M. J. Boschini, G. Boudoul, M. Bourquin, P. Brun, M. Buénerd, J. Burger, W. Burger, F. Cadoux, X. D. Cai, M. Capell, D. Casadei, J. Casaus, V. Cascioli, G. Castellini, I. Cernuda, F. Cervelli, M. J. Chae, Y. H. Chang, A. I. Chen, C. R. Chen, H. Chen, G. M. Cheng, H. S. Chen, L. Cheng, N. Chernoplyiokov, A. Chikanian, E. Choumilov, V. Choutko, C. H. Chung, C. Clark, R. Clavero, G. Coignet, V. Commichau, C. Consolandi, A. Contin, C. Corti, M. T. Costado Dios, B. Coste, D. Crespo, Z. Cui, M. Dai, C. Delgado, S. Della Torre, B. Demirkoz, P. Dennett, L. Derome, S. Di Falco, X. H. Diao, A. Diago, L. Djambazov, C. Díaz, P. Von Doetinchem, W. J. Du, J. M. Dubois, R. Duperay, M. Duranti, D. D'Urso, A. Egorov, A. Eline, F. J. Eppling, T. Eronen, J. Van Es, H. Esser, A. Falvard, E. Fiandrini, A. Fiasson, E. Finch, P. Fisher, K. Flood, R. Foglio, M. Fohey, S. Fopp, N. Fouque, Y. Galaktionov, M. Gallilee, L. Gallin-Martel, G. Gallucci, B. García, J. García, R. García-López, L. García-Tabares, C. Gargiulo, H. Gast, I. Gebauer, S. Gentile, M. Gervasi, W. Gillard, F. Giovacchini, L. Girard, P. Goglov, J. Gong, C. Goy-Henningsen, D. Grandi, M. Graziani, A. Grechko, A. Gross, I. Guerri, C. De La Guía, K. H. Guo, M. Habiby, S. Haino, F. Hauler, Z. H. He, M. Heil, J. Heilig, R. Hermel, H. Hofer, Z. C. Huang, W. Hungerford, M. Incagli, M. Ionica, A. Jacholkowska, W. Y. Jang, H. Jinchi, M. Jongmanns, L. Journet, L. Jungermann, W. Karpinski, G. N. Kim, K. S. Kim, Th Kirn, R. Kossakowski, A. Koulemzine, O. Kounina, A. Kounine, V. Koutsenko, M. S. Krafczyk, E. Laudi, G. Laurenti, C. Lauritzen, A. Lebedev, M. W. Lee, S. C. Lee, C. Leluc, H. León Vargas, V. Lepareur, J. Q. Li, Q. Li, T. X. Li, W. Li, Z. H. Li, P. Lipari, C. H. Lin, D. Liu, H. Liu, T. Lomtadze, Y. S. Lu, S. Lucidi, K. Lübelsmeyer, J. Z. Luo, W. Lustermann, S. Lv, J. Madsen, R. Majka, A. Malinin, C. Mañá, J. Marín, T. Martin, G. Martínez, F. Masciocchi, N. Masi, D. Maurin, A. McInturff, P. McIntyre, A. Menchaca-Rocha, Q. Meng, M. Menichelli, I. Mereu, M. Millinger, D. C. Mo, M. Molina, P. Mott, A. Mujunen, S. Natale, P. Nemeth, J. Q. Ni, N. Nikonov, F. Nozzoli, P. Nunes, A. Obermeier, S. Oh, A. Oliva, F. Palmonari, C. Palomares, M. Paniccia, A. Papi, W. H. Park, M. Pauluzzi, F. Pauss, A. Pauw, E. Pedreschi, S. Pensotti, R. Pereira, E. Perrin, G. Pessina, G. Pierschel, F. Pilo, A. Piluso, C. Pizzolotto, V. Plyaskin, J. Pochon, M. Pohl, V. Poireau, S. Porter, J. Pouxe, A. Putze, L. Quadrani, X. N. Qi, P. G. Rancoita, D. Rapin, Z. L. Ren, J. S. Ricol, E. Riihonen, I. Rodríguez, U. Roeser, S. Rosier-Lees, L. Rossi, A. Rozhkov, D. Rozza, A. Sabellek, R. Sagdeev, J. Sandweiss, B. Santos, P. Saouter, M. Sarchioni, S. Schael, D. Schinzel, M. Schmanau, G. Schwering, A. Schulz Von Dratzig, G. Scolieri, E. S. Seo, B. S. Shan, J. Y. Shi, Y. M. Shi, T. Siedenburg, R. Siedling, D. Son, F. Spada, F. Spinella, M. Steuer, K. Stiff, W. Sun, W. H. Sun, X. H. Sun, M. Tacconi, C. P. Tang, X. W. Tang, Z. C. Tang, L. Tao, J. Tassan-Viol, Samuel C.C. Ting, S. M. Ting, C. Titus, N. Tomassetti, F. Toral, J. Torsti, J. R. Tsai, J. C. Tutt, J. Ulbricht, T. Urban, V. Vagelli, E. Valente, C. Vannini, E. Valtonen, M. Vargas Trevino, S. Vaurynovich, M. Vecchi, M. Vergain, B. Verlaat, C. Vescovi, J. P. Vialle, G. Viertel, G. Volpini, D. Wang, N. H. Wang, Q. L. Wang, R. S. Wang, X. Wang, Z. X. Wang, W. Wallraff, Z. L. Weng, M. Willenbrock, M. Wlochal, H. Wu, K. Y. Wu, Z. S. Wu, W. J. Xiao, S. Xie, R. Q. Xiong, G. M. Xin, N. S. Xu, W. Xu, Q. Yan, J. Yang, M. Yang, Q. H. Ye, H. Yi, Y. J. Yu, Z. Q. Yu, S. Zeissler, J. G. Zhang, Z. Zhang, M. M. Zhang, Z. M. Zheng, H. L. Zhuang, V. Zhukov, A. Zichichi, P. Zuccon, C. Zurbach
*Corresponding author for this work
  • CERN
  • CIEMAT
  • National Institute for Nuclear Physics
  • University of Perugia
  • Institut für Experimentelle Kernphysik
  • Karlsruhe Institute of Technology
  • Institute for Particle Physics
  • ETH Zurich - Institute for Particle Physics and Astrophysics (IPA)
  • Laboratório de Instrumentação e Física Experimental de Partículas
  • University of Geneva
  • RWTH Aachen University
  • Laboratoire de Physique Subatomique et de Cosmologie de Grenoble
  • Université Savoie Mont Blanc
  • Massachusetts Institute of Technology
  • NASA Johnson Space Center
  • University of Trento
  • University of Pisa
  • Physics and Astronomy Department
  • University of Hawai'i at Mānoa
  • University of Milan - Bicocca
  • LUPM (Ex LPTA)
  • Laboratoire Univers et Particules de Montpellier
  • University of Rome La Sapienza
  • University of Bologna
  • National Research Council of Italy
  • Department of Physics
  • Ewha Womans University
  • National Central University
  • National Applied Research Laboratories Taiwan
  • CAS - Institute of High Energy Physics
  • Shandong University
  • Russian Research Centre Kurchatov Institute
  • Yale University
  • Instituto de Astrofísica de Canarias
  • IEE
  • CAS - Institute of Electrical Engineering
  • Physics Department
  • Middle East Technical University
  • Sun Yat-Sen University
  • Space Research Laboratory
  • University of Turku
  • Royal Netherlands Aerospace Centre
  • Southeast University, Nanjing
  • Kyungpook National University
  • Chung-shan Institute of Science and Technology Taiwan
  • Academia Sinica - Institute of Physics
  • Instituto de Física
  • Universidad Nacional Autónoma de México
  • Beihang University
  • Department of Physics and Astronomy
  • Aarhus University
  • University of Maryland, College Park
  • Department of Physics
  • Texas A&M University
  • Metsahovi Radio Observatory
  • Aalto University
  • ASDC ESRIN
  • University of Milan
  • East-West Center for Space Science
  • Shanghai Jiao Tong University
  • National Institute for Subatomic Physics

Research output: Contribution to journal › Article › peer-review

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.

Original languageEnglish
Article number141102
JournalPhysical Review Letters
Volume110
Issue number14
DOIs
StatePublished - 3 Apr 2013

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