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,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,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,P Zuccon

PHYSICAL REVIEW LETTERS（2016）

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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 R. with index. Delta = -0.333 +/- 0.014(fit) +/- 0.005(syst), in good agreement with the Kolmogorov theory of turbulence which predicts. Delta = -1/3 asymptotically.

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Key words

cosmic rays,alpha magnetic spectrometer,carbon flux ratio,boron

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