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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.
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 J; Boudoul, G; Bourquin, M; Brun, P; Buénerd, M; Burger, J; Burger, W; Cadoux, F; Cai, X D; Capell, M; Casadei, D; Casaus, J.
Affiliation
  • Aguilar M; European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland and Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain.
  • Alberti G; INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy.
  • Alpat B; INFN-Sezione di Perugia, I-06100 Perugia, Italy.
  • Alvino A; INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy.
  • Ambrosi G; INFN-Sezione di Perugia, I-06100 Perugia, Italy.
  • Andeen K; Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany.
  • Anderhub H; Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland.
  • Arruda L; Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Azzarello P; DPNC, Université de Genève, CH-1211 Genève 4, Switzerland and INFN-Sezione di Perugia, I-06100 Perugia, Italy.
  • Bachlechner A; I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany.
  • Barao F; Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Baret B; Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France.
  • Barrau A; Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France.
  • Barrin L; European Organization for Nuclear Research, CERN, CH-1211 Geneva 23, Switzerland.
  • Bartoloni A; INFN-Sezione di Roma 1, I-00185 Roma, Italy.
  • Basara L; Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Basili A; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Batalha L; Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Bates J; NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA.
  • Battiston R; INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy and INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italy.
  • Bazo J; INFN-Sezione di Perugia, I-06100 Perugia, Italy.
  • Becker R; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Becker U; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Behlmann M; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Beischer B; I. Physikalisches Institut B, RWTH, D-52056 Aachen, Germany.
  • Berdugo J; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain.
  • Berges P; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Bertucci B; INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy.
  • Bigongiari G; INFN-Sezione di Pisa, I-56100 Pisa, Italy and Università di Pisa, I-56100 Pisa, Italy.
  • Biland A; Institute for Particle Physics, ETH Zürich, CH-8093 Zürich, Switzerland.
  • Bindi V; University of Hawaii, Physics and Astronomy Department, 2505 Correa Road, WAT 432; Honolulu, Hawaii 96822, USA.
  • Bizzaglia S; INFN-Sezione di Perugia, I-06100 Perugia, Italy.
  • Boella G; INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy and Università di Milano-Bicocca, I-20126 Milano, Italy.
  • de Boer W; Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, Germany.
  • Bollweg K; NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA.
  • Bolmont J; Laboratoire Univers et Particules de Montpellier, LUPM (ex LPTA), IN2P3/CNRS and Université de Montpellier II, F-34095 Montpellier, France.
  • Borgia B; INFN-Sezione di Roma 1, I-00185 Roma, Italy and Università di Roma La Sapienza, I-00185 Roma, Italy.
  • Borsini S; INFN-Sezione di Perugia, I-06100 Perugia, Italy and Università di Perugia, I-06100 Perugia, Italy.
  • Boschini MJ; INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italy.
  • Boudoul G; Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France.
  • Bourquin M; DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Brun P; Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Buénerd M; Laboratoire de Physique subatomique et de cosmologie, LPSC, IN2P3/CNRS and Université Joseph Fourier, Grenoble INP, F-38026 Grenoble, France.
  • Burger J; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Burger W; Università di Perugia, I-06100 Perugia, Italy.
  • Cadoux F; Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France and DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Cai XD; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Capell M; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Casadei D; INFN-Sezione di Bologna, I-40126 Bologna, Italy and Università di Bologna, I-40126 Bologna, Italy.
  • Casaus J; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, Spain.
Phys Rev Lett ; 110(14): 141102, 2013 Apr 05.
Article in En | MEDLINE | ID: mdl-25166975
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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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2013 Document type: Article Affiliation country: España
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Collection: 01-internacional Database: MEDLINE Language: En Journal: Phys Rev Lett Year: 2013 Document type: Article Affiliation country: España