A1 Refereed original research article in a scientific journal

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





AuthorsM. Aguilar, L. Ali Cavasonza, G. Ambrosi, L. Arruda, N. Attig, S. Aupetit, P. Azzarello, A. Bachlechner, F. Barao, A. Barrau, L. Barrin, A. Bartoloni, L. Basara, S. Başeğmez-du Pree, M. Battarbee, R. Battiston, U. Becker, M. Behlmann, B. Beischer, J. Berdugo, B. Bertucci, K. F. Bindel, V. Bindi, G. Boella, W. de Boer, K. Bollweg, V. Bonnivard, B. Borgia, M. J. Boschini, M. Bourquin, E. F. Bueno, J. Burger, F. Cadoux, X. D. Cai, M. Capell, S. Caroff, J. Casaus, G. Castellini, F. Cervelli, M. J. Chae, Y. H. Chang, A. I. Chen, G. M. Chen, H. S. Chen, L. Cheng, H. Y. Chou, E. Choumilov, V. Choutko, C. H. Chung, C. Clark, R. Clavero, G. Coignet, C. Consolandi, A. Contin, C. Corti, W. Creus, M. Crispoltoni, Z. Cui, Y. M. Dai, C. Delgado, S. Della Torre, O. Demakov, M. B. Demirköz, L. Derome, S. Di Falco, F. Dimiccoli, C. Díaz, P. von Doetinchem, F. Dong, F. Donnini, M. Duranti, D. D’Urso, A. Egorov, A. Eline, T. Eronen, J. Feng, E. Fiandrini, E. Finch, P. Fisher, V. Formato, Y. Galaktionov, G. Gallucci, B. García, R. J. García-López, C. Gargiulo, H. Gast, I. Gebauer, M. Gervasi, A. Ghelfi, F. Giovacchini, P. Goglov, D. M. Gómez-Coral, J. Gong, C. Goy, V. Grabski, D. Grandi, M. Graziani, K. H. Guo, S. Haino, K. C. Han, Z. H. He, M. Heil, J. Hoffman, T. H. Hsieh, H. Huang, Z. C. Huang, C. Huh, M. Incagli, M. Ionica, W. Y. Jang, H. Jinchi, S. C. Kang, K. Kanishev, G. N. Kim, K. S. Kim, Th. Kirn, C. Konak, O. Kounina, A. Kounine, V. Koutsenko, M. S. Krafczyk, G. La Vacca, E. Laudi, G. Laurenti, I. Lazzizzera, A. Lebedev, H. T. Lee, S. C. Lee, C. Leluc, H. S. Li, J. Q. Li,,e J. Q. Li, Q. Li, T. X. Li, W. Li, Y. Li, Z. H. Li, Z. Y. Li, S. Lim, C. H. Lin, P. Lipari, T. Lippert, D. Liu, Hu Liu, V. D. Lordello, S. Q. Lu, Y. S. Lu, K. Luebelsmeyer, F. Luo, J. Z. Luo, S. S. Lv, F. Machate, R. Majka, C. Mañá, J. Marín, T. Martin, G. Martínez, N. Masi, D. Maurin, A. Menchaca-Rocha, Q. Meng, V. M. Mikuni, D. C. Mo, L. Morescalchi, P. Mott, T. Nelson, J. Q. Ni, N. Nikonov, F. Nozzoli, A. Oliva, M. Orcinha, F. Palmonari, C. Palomares, M. Paniccia, M. Pauluzzi, S. Pensotti, R. Pereira, N. Picot-Clemente, F. Pilo, C. Pizzolotto, V. Plyaskin, M. Pohl, V. Poireau, A. Putze, L. Quadrani, X. M. Qi, X. Qin, Z. Y. Qu, T. Räihä, P. G. Rancoita, D. Rapin, J. S. Ricol, S. Rosier-Lees, A. Rozhkov, D. Rozza, R. Sagdeev, J. Sandweiss, P. Saouter, S. Schael, S. M. Schmidt, A. Schulz von Dratzig, G. Schwering, E. S. Seo, B. S. Shan, J. Y. Shi, T. Siedenburg, D. Son, J.W. Song, W. H. Sun, M. Tacconi, X.W. Tang, Z. C. Tang, L. Tao, D. Tescaro, Samuel C. C. Ting, S. M. Ting, N. Tomassetti, J. Torsti, C. Türkoğlu, T. Urban, V. Vagelli, E. Valente, C. Vannini, E. Valtonen, M. Vázquez Acosta, M. Vecchi, M. Velasco, J. P. Vialle, V. Vitale, S. Vitillo, L. Q. Wang, N. H. Wang, Q. L. Wang, X. Wang, X. Q. Wang, Z. X. Wang, C. C. Wei, Z. L. Weng, K. Whitman, J. Wienkenhöver, H. Wu, X. Wu, X. Xia, R. Q. Xiong, W. Xu, Q. Yan, J. Yang, M. Yang, Y. Yang, H. Yi, Y. J. Yu, Z. Q. Yu, S. Zeissler, C. Zhang, J. Zhang, J. H. Zhang, S. D. Zhang, S.W. Zhang, Z. Zhang, Z. M. Zheng, Z. Q. Zhu, H. L. Zhuang, V. Zhukov, A. Zichichi, N. Zimmermann, and P. Zuccon

PublisherAmerican Physical Society

Publication year2016

JournalPhysical Review Letters

Journal acronymPRL

Article number231102

Volume117

Issue23

First page 231102-1

Last page231102-8

Number of pages8

ISSN0031-9007

eISSN1079-7114

DOIhttps://doi.org/10.1103/PhysRevLett.117.231102

Web address http://journals.aps.org/prl/abstract/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 B/C 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 B/C spectral index is reported for the first time. The B/C 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 B/C ratio is well described by a single power law RΔ with index Δ = −0.333 +/- 0.014(fit) +/- 0.005(syst), in good agreement with the Kolmogorov theory of turbulence which predicts Δ = −1/3 asymptotically.


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