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

M. Aguilar L. Ali Cavasonza G. Ambrosi L. Arruda N. Attig S. Aupetit 1 P. Azzarello A. Bachlechner F. Barao A. Barrau 1 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. Bindel V. Bindi G. Boella W. de Boer K. Bollweg V. Bonnivard 1 B. Borgia J. Boschini M. Bourquin E. Bueno J. Burger F. Cadoux X. Cai M. Capell S. Caroff 2 J. Casaus G. Castellini F. Cervelli J. Chae H. Chang A. Chen M. Chen S. Chen L. Cheng H. Chou E. Choumilov V. Choutko C. Chung C. Clark R. Clavero G. Coignet 2 C. Consolandi A. Contin C. Corti W. Creus M. Crispoltoni Z. Cui Y. Dai C. Delgado S. Della Torre O. Demakov M. Demirköz L. Derome 1 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 J. García-López C. Gargiulo H. Gast I. Gebauer M. Gervasi A. Ghelfi 1 F. Giovacchini P. Goglov M. Gómez-Coral J. Gong C. Goy 2 V. Grabski D. Grandi M. Graziani H. Guo S. Haino C. Han Z. He M. Heil J. Hoffman H. Hsieh H. Huang Z. Huang C. Huh M. Incagli M. Ionica Y. Jang H. Jinchi C. Kang K. Kanishev N. Kim S. Kim Th. Kirn C. Konak O. Kounina A. Kounine V. Koutsenko S. Krafczyk G. La Vacca E. Laudi G. Laurenti I. Lazzizzera A. Lebedev H. Lee C. Lee C. Leluc S. Li J. Li Q. Li X. Li W. Li Y. Li Z. Li S. Lim C. Lin P. Lipari T. Lippert D. Liu Hu Liu V. Lordello S. Lu K. Luebelsmeyer F. Luo Z. Luo S. Lv F. Machate R. Majka C. Mañá J. Marín T. Martin Gines Martinez Garcia N. Masi D. Maurin 1 A. Menchaca-Rocha Q. Meng V. Mikuni C. Mo L. Morescalchi P. Mott T. Nelson J. 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 2 A. Putze 2 L. Qu M. Qi X. Qin Z. Qu T. Räihä P. Rancoita D. Rapin J. Ricol 1 S. Rosier-Lees 2 A. Rozhkov D. Rozza R. Sagdeev J. Sandweiss P. Saouter S. Schael S. Schmidt A. Schulz von Dratzig G. Schwering S. Seo S. Shan J. Shi T. Siedenburg D. Son J. Song H. Sun M. Tacconi W. Tang Z. Tang L. Tao 2 D. Tescaro C. Ting S. Ting N. Tomassetti J. Torsti C. Türkoğlu T. Urban V. Vagelli E. Valente C. Vannini E. Valtonen M. Vázquez Acosta M. Vecchi M. Velasco P. Vialle 2 V. Vitale S. Vitillo Qiang Wang N. Wang X. Wang Z. Wang C. Wei Z. Weng K. Whitman J. Wienkenhöver H. Wu X. Wu X. Xia Q. Xiong W. Xu Q. Yan J. Yang M. Yang Y. Yang H. Yi J. Yu Z. q. Yu S. Zeissler C. Zhang J. Zhang J. h. Zhang S. d. Zhang S. w. Zhang Zhongkai Zhang Z. m. Zheng Z. q. Zhu H. l. Zhuang V. Zhukov A. Zichichi N. Zimmermann P. Zuccon
1 LPSC - Laboratoire de Physique Subatomique et de Cosmologie
2 LAPP/Laboratoire d'Annecy-le-Vieux de Physique des Particules - Laboratoire d'Annecy de Physique des Particules
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 ¼ −0.333 + 0.014ðfitÞ + 0.005ðsystÞ, in good agreement with the Kolmogorov theory of turbulence which predicts Δ ¼ −1=3 asymptotically.
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Submitted on : Wednesday, December 7, 2016 - 9:08:52 AM
Last modification on : Thursday, December 12, 2019 - 9:48:14 AM

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M. Aguilar, L. Ali Cavasonza, G. Ambrosi, L. Arruda, N. Attig, et al.. 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. Physical Review Letters, American Physical Society, 2016, 117 (23), pp.231102. ⟨10.1103/PhysRevLett.117.231102⟩. ⟨in2p3-01411103⟩

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