Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station
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Open Access
- 28 November 2016
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 117 (23), 231102
- https://doi.org/10.1103/physrevlett.117.231102
Abstract
Knowledge of the rigidity dependence of the boron to carbon flux ratio (B/C) is important in understanding the propagation of cosmic rays. The precise measurement of the ratio from 1.9 GV to 2.6 TV, based on 2.3 million boron and 8.3 million carbon nuclei collected by AMS during the first 5 years of operation, is presented. The detailed variation with rigidity of the spectral index is reported for the first time. The ratio does not show any significant structures in contrast to many cosmic ray models that require such structures at high rigidities. Remarkably, above 65 GV, the ratio is well described by a single power law with index , in good agreement with the Kolmogorov theory of turbulence which predicts asymptotically.
Funding Information
- National Aeronautics and Space Administration
- Johnson Space Center
- Marshall Space Flight Center
- U.S. Department of Energy
- Massachusetts Institute of Technology
- Fundação de Amparo à Pesquisa do Estado de São Paulo (2015/50378-5, 2015/13533-2, 2016/10222-9)
- Chinese Academy of Sciences
- National Natural Science Foundation of China
- Natural Science Foundation of Shandong Province
- Ministry of Science and Technology of the People’s Republic of China
- China Scholarship Council
- Horizon 2020 (707543-MAtISSE)
- Tekes (40361/01, 40518/03)
- Suomen Akatemia (258963)
- Centre National de la Recherche Scientifique
- Centre National d’Etudes Spatiales
- Agence Nationale de la Recherche
- Deutsches Zentrum für Luft- und Raumfahrt
- Instituto Nazionale di Fisica Nucleare
- Agenzia Spaziale Italiana (2013-002-R.0, 2014-037-R.0)
- National Research Foundation of Korea (NRF-2009-0080142, NRF-2012-010226, NRF-2013-004883)
- Kyungpook National University
- Ewha Womans University
- Consejo Nacional de Ciencia y Tecnología
- Universidad Nacional Autónoma de México
- Fundação para a Ciência e a Tecnologia (PTDC/FIS/122567/2010)
- Centre for Industrial Technological Development
- Secretaría de Estado de Investigación, Desarrollo e Innovación (AYA2012-39526-C02-(01/02), ESP2015-71662-C2-(1-P/2-P), SEV-2011-0187, SEV-2015-0548, MDM-2015-0509)
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
- Academia Sinica
- Ministry of Science and Technology, Taiwan (103-2112-M-006-018-MY3, 105-2112-M-001-003, CDA-105-M06)
- Türkiye Atom Enerjisi Kurumu
- National Science Foundation (1455202, 1551980)
- European Space Agency
- National Laboratory for Aeronautics and Astronautics, Beijing
- Jülich-Aachen Research Alliance - High Performance Computing (JARA0052)
- CHEP
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, Madrid
- Instituto de Astrofísica de Canarias, Spain
- Wyle Laboratories (2014/T72497)
- NASA NESSF (HELIO15F-0005)
- CERN
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