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Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer.
Aguilar, M; Ali Cavasonza, L; Ambrosi, G; Arruda, L; Attig, N; Bachlechner, A; Barao, F; Barrau, A; Barrin, L; Bartoloni, A; Basegmez-du Pree, S; Battiston, R; Becker, U; Behlmann, M; Beischer, B; Berdugo, J; Bertucci, B; Bindi, V; de Boer, W; Bollweg, K; Borgia, B; Boschini, M J; Bourquin, M; Bueno, E F; Burger, J; Burger, W J; Cai, X D; Capell, M; Caroff, S; Casaus, J; Castellini, G; Cervelli, F; Chang, Y H; Chen, G M; Chen, H S; Chen, Y; Cheng, L; Chou, H Y; Choutko, V; Chung, C H; Clark, C; Coignet, G; Consolandi, C; Contin, A; Corti, C; Cui, Z; Dadzie, K; Dai, Y M; Datta, A; Delgado, C.
Afiliação
  • Aguilar M; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, Spain.
  • Ali Cavasonza L; I. Physics Institute and JARA-FAME, RWTH Aachen University, 52056 Aachen, Germany.
  • Ambrosi G; INFN Sezione di Perugia, 06100 Perugia, Italy.
  • Arruda L; Laboratório de Instrumentação e Física Experimental de Partículas (LIP), 1000 Lisboa, Portugal.
  • Attig N; Jülich Supercomputing Centre and JARA-FAME, Research Centre Jülich, 52425 Jülich, Germany.
  • Bachlechner A; I. Physics Institute and JARA-FAME, RWTH Aachen University, 52056 Aachen, Germany.
  • Barao F; Laboratório de Instrumentação e Física Experimental de Partículas (LIP), 1000 Lisboa, Portugal.
  • Barrau A; Université Grenoble Alpes, CNRS, Grenoble INP, LPSC-IN2P3, 38000 Grenoble, France.
  • Barrin L; European Organization for Nuclear Research (CERN), 1211 Geneva 23, Switzerland.
  • Bartoloni A; INFN Sezione di Roma 1, 00185 Roma, Italy.
  • Basegmez-du Pree S; KVI-Center for Advanced Radiation Technology, University of Groningen, 9700 AB Groningen, The Netherlands.
  • Battiston R; INFN TIFPA, 38123 Povo, Trento, Italy.
  • Becker U; Università di Trento, 38123 Povo, Trento, Italy.
  • Behlmann M; Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA.
  • Beischer B; Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA.
  • Berdugo J; I. Physics Institute and JARA-FAME, RWTH Aachen University, 52056 Aachen, Germany.
  • Bertucci B; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, Spain.
  • Bindi V; INFN Sezione di Perugia, 06100 Perugia, Italy.
  • de Boer W; Università di Perugia, 06100 Perugia, Italy.
  • Bollweg K; Physics and Astronomy Department, University of Hawaii, Honolulu, Hawaii 96822, USA.
  • Borgia B; Institut für Experimentelle Teilchenphysik, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany.
  • Boschini MJ; National Aeronautics and Space Administration Johnson Space Center (JSC), Houston, Texas 77058, USA.
  • Bourquin M; INFN Sezione di Roma 1, 00185 Roma, Italy.
  • Bueno EF; Università di Roma La Sapienza, 00185 Roma, Italy.
  • Burger J; INFN Sezione di Milano-Bicocca, 20126 Milano, Italy.
  • Burger WJ; DPNC, Université de Genève, 1211 Genève 4, Switzerland.
  • Cai XD; KVI-Center for Advanced Radiation Technology, University of Groningen, 9700 AB Groningen, The Netherlands.
  • Capell M; Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA.
  • Caroff S; INFN TIFPA, 38123 Povo, Trento, Italy.
  • Casaus J; Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA.
  • Castellini G; Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA.
  • Cervelli F; Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, LAPP-IN2P3, 74000 Annecy, France.
  • Chang YH; Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), 28040 Madrid, Spain.
  • Chen GM; CNR-IROE, 50125 Firenze, Italy.
  • Chen HS; INFN Sezione di Pisa, 56100 Pisa, Italy.
  • Chen Y; Physics Department and Center for High Energy and High Field, National Central University (NCU), Tao Yuan 32054, Taiwan.
  • Cheng L; Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing 100049, China.
  • Chou HY; University of Chinese Academy of Sciences (UCAS), Beijing 100049, China.
  • Choutko V; Institute of High Energy Physics (IHEP), Chinese Academy of Sciences, Beijing 100049, China.
  • Chung CH; University of Chinese Academy of Sciences (UCAS), Beijing 100049, China.
  • Clark C; DPNC, Université de Genève, 1211 Genève 4, Switzerland.
  • Coignet G; Shandong University (SDU), Jinan, Shandong 250100, China.
  • Consolandi C; Physics Department and Center for High Energy and High Field, National Central University (NCU), Tao Yuan 32054, Taiwan.
  • Contin A; Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA.
  • Corti C; I. Physics Institute and JARA-FAME, RWTH Aachen University, 52056 Aachen, Germany.
  • Cui Z; Massachusetts Institute of Technology (MIT), Cambridge, Massachusetts 02139, USA.
  • Dadzie K; National Aeronautics and Space Administration Johnson Space Center (JSC), Houston, Texas 77058, USA.
  • Dai YM; Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, LAPP-IN2P3, 74000 Annecy, France.
  • Datta A; Physics and Astronomy Department, University of Hawaii, Honolulu, Hawaii 96822, USA.
  • Delgado C; INFN Sezione di Bologna, 40126 Bologna, Italy.
Phys Rev Lett ; 123(18): 181102, 2019 Nov 01.
Article em En | MEDLINE | ID: mdl-31763896
ABSTRACT
Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of ^{3}He and ^{4}He fluxes are presented. The measurements are based on 100 million ^{4}He nuclei in the rigidity range from 2.1 to 21 GV and 18 million ^{3}He from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the ^{3}He and ^{4}He fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the ^{3}He/^{4}He flux ratio is measured for the first time. Below 4 GV, the ^{3}He/^{4}He flux ratio was found to have a significant long-term time dependence. Above 4 GV, the ^{3}He/^{4}He flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law ∝R^{Δ} with Δ=-0.294±0.004. Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Espanha
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2019 Tipo de documento: Article País de afiliação: Espanha