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High statistics measurement of the positron fraction in primary cosmic rays of 0.5-500 GeV with the alpha magnetic spectrometer on the international space station.
Accardo, L; Aguilar, M; Aisa, D; Alpat, B; Alvino, A; Ambrosi, G; Andeen, K; Arruda, L; Attig, N; Azzarello, P; Bachlechner, A; Barao, F; Barrau, A; Barrin, L; Bartoloni, A; Basara, L; Battarbee, M; Battiston, R; Bazo, J; Becker, U; Behlmann, M; Beischer, B; Berdugo, J; Bertucci, B; Bigongiari, G; Bindi, V; Bizzaglia, S; Bizzarri, M; Boella, G; de Boer, W; Bollweg, K; Bonnivard, V; Borgia, B; Borsini, S; Boschini, M J; Bourquin, M; Burger, J; Cadoux, F; Cai, X D; Capell, M; Caroff, S; Carosi, G; Casaus, J; Cascioli, V; Castellini, G; Cernuda, I; Cerreta, D; Cervelli, F; Chae, M J; Chang, Y H.
Afiliação
  • Accardo L; INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Aguilar M; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Aisa D; INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Alpat B; INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Alvino A; INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Ambrosi G; INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Andeen K; Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB.
  • Arruda L; Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Attig N; Jülich Supercomputing Centre and JARA-FAME, Research Centre Jülich, D-52425 Jülich, GermanyA.
  • Azzarello P; DPNC, Université de Genève, CH-1211 Genève 4, Switzerland and INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Bachlechner A; I. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Barao F; Laboratório de Instrumentação e Física Experimental de Partículas, LIP, P-1000 Lisboa, Portugal.
  • Barrau A; Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, 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, Italyx.
  • Basara L; Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France and INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx.
  • Battarbee M; Space Research Laboratory, Department of Physics and Astronomy, University of Turku, FI-20014 Turku, Finland.
  • Battiston R; INFN-TIFPA and Università di Trento, I-38123 Povo, Trento, Italyx.
  • Bazo J; INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • 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. Physics Institute and JARA-FAME, RWTH Aachen University, D-52056 Aachen, Germanyu.
  • Berdugo J; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Bertucci B; INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Bigongiari G; INFN-Sezione di Pisa, I-56100 Pisa, Italyx and Università di Pisa, I-56100 Pisa, Italy.
  • Bindi V; Physics and Astronomy Department, University of Hawaii, 2505 Correa Road, WAT 432, Honolulu, Hawaii 96822, USA.
  • Bizzaglia S; INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Bizzarri M; INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Boella G; INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx and Università di Milano-Bicocca, I-20126 Milano, Italy.
  • de Boer W; Institut für Experimentelle Kernphysik, Karlsruhe Institute of Technology, KIT, D-76128 Karlsruhe, GermanyB.
  • Bollweg K; NASA, National Aeronautics and Space Administration, Johnson Space Center, JSC, and Jacobs-Sverdrup, Houston, Texas 77058, USA.
  • Bonnivard V; Laboratoire de Physique Subatomique et de Cosmologie, LPSC, Université Grenoble-Alpes, CNRS/IN2P3, F-38026 Grenoble, France.
  • Borgia B; INFN-Sezione di Roma 1, I-00185 Roma, Italyx and Università di Roma La Sapienza, I-00185 Roma, Italy.
  • Borsini S; INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Boschini MJ; INFN-Sezione di Milano-Bicocca, I-20126 Milano, Italyx.
  • Bourquin M; DPNC, Université de Genève, CH-1211 Genève 4, Switzerland.
  • Burger J; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Cadoux F; 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.
  • Caroff S; Laboratoire d'Annecy-Le-Vieux de Physique des Particules, LAPP, IN2P3/CNRS and Université de Savoie, F-74941 Annecy-le-Vieux, France.
  • Carosi G; Massachusetts Institute of Technology, MIT, Cambridge, Massachusetts 02139, USA.
  • Casaus J; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Cascioli V; INFN-Sezione di Perugia, I-06100 Perugia, Italyx.
  • Castellini G; CNR-IROE, I-50125 Firenze, Italy.
  • Cernuda I; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT, E-28040 Madrid, SpainC.
  • Cerreta D; INFN-Sezione di Perugia, I-06100 Perugia, Italyx and Università di Perugia, I-06100 Perugia, Italy.
  • Cervelli F; INFN-Sezione di Pisa, I-56100 Pisa, Italyx.
  • Chae MJ; Department of Physics, Ewha Womans University, Seoul 120-750, KoreaE.
  • Chang YH; National Central University, NCU, Chung-Li, Tao Yuan 32054, Taiwany.
Phys Rev Lett ; 113(12): 121101, 2014 Sep 19.
Article em En | MEDLINE | ID: mdl-25279616
A precision measurement by AMS of the positron fraction in primary cosmic rays in the energy range from 0.5 to 500 GeV based on 10.9 million positron and electron events is presented. This measurement extends the energy range of our previous observation and increases its precision. The new results show, for the first time, that above ∼200 GeV the positron fraction no longer exhibits an increase with energy.
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Base de dados: MEDLINE Idioma: En Ano de publicação: 2014 Tipo de documento: Article
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Base de dados: MEDLINE Idioma: En Ano de publicação: 2014 Tipo de documento: Article