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. 2016 Dec 2;117(23):231102.
doi: 10.1103/PhysRevLett.117.231102. Epub 2016 Nov 28.

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  1 L Ali Cavasonza  2 G Ambrosi  3 L Arruda  4 N Attig  5 S Aupetit  6 P Azzarello  7 A Bachlechner  2 F Barao  4 A Barrau  6 L Barrin  8 A Bartoloni  9 L Basara  10 S Başeğmez-du Pree  11 M Battarbee  12 R Battiston  10   13 U Becker  14 M Behlmann  14 B Beischer  2 J Berdugo  1 B Bertucci  3   15 K F Bindel  16 V Bindi  17 G Boella  18   19 W de Boer  16 K Bollweg  20 V Bonnivard  6 B Borgia  9   21 M J Boschini  18 M Bourquin  7 E F Bueno  22 J Burger  14 F Cadoux  7 X D Cai  14 M Capell  14 S Caroff  23 J Casaus  1 G Castellini  24 F Cervelli  25 M J Chae  26 Y H Chang  27 A I Chen  14 G M Chen  11 H S Chen  11 L Cheng  28 H Y Chou  27 E Choumilov  14 V Choutko  14 C H Chung  2 C Clark  20 R Clavero  29 G Coignet  23 C Consolandi  17 A Contin  30   31 C Corti  17 W Creus  32 M Crispoltoni  8   3   15 Z Cui  28 Y M Dai  33 C Delgado  1 S Della Torre  18 O Demakov  14 M B Demirköz  34 L Derome  6 S Di Falco  25 F Dimiccoli  10   13 C Díaz  1 P von Doetinchem  17 F Dong  35 F Donnini  8   3   15 M Duranti  3   15 D D'Urso  3 A Egorov  14 A Eline  14 T Eronen  12 J Feng  32 E Fiandrini  3   15 E Finch  36 P Fisher  14 V Formato  8   3 Y Galaktionov  14 G Gallucci  25 B García  1 R J García-López  29 C Gargiulo  8 H Gast  2 I Gebauer  16 M Gervasi  18   19 A Ghelfi  6 F Giovacchini  1 P Goglov  14 D M Gómez-Coral  37 J Gong  35 C Goy  23 V Grabski  37 D Grandi  18 M Graziani  3   15 K H Guo  38 S Haino  32 K C Han  39 Z H He  38 M Heil  14 J Hoffman  17 T H Hsieh  14 H Huang  32 Z C Huang  38 C Huh  40 M Incagli  25 M Ionica  3 W Y Jang  40 H Jinchi  39 S C Kang  40 K Kanishev  10   13 G N Kim  40 K S Kim  40 Th Kirn  2 C Konak  34 O Kounina  14 A Kounine  14 V Koutsenko  14 M S Krafczyk  14 G La Vacca  18 E Laudi  8 G Laurenti  30 I Lazzizzera  10   13 A Lebedev  14 H T Lee  41 S C Lee  32 C Leluc  7 H S Li  42 J Q Li  14 J Q Li  35 Q Li  35 T X Li  38 W Li  43 Y Li  7 Z H Li  11 Z Y Li  32 S Lim  40 C H Lin  32 P Lipari  9 T Lippert  5 D Liu  27 Hu Liu  1 V D Lordello  22 S Q Lu  32 Y S Lu  11 K Luebelsmeyer  2 F Luo  28 J Z Luo  35 S S Lv  38 F Machate  2 R Majka  36 C Mañá  1 J Marín  1 T Martin  20 G Martínez  1 N Masi  30 D Maurin  6 A Menchaca-Rocha  37 Q Meng  35 V M Mikuni  22 D C Mo  38 L Morescalchi  25 P Mott  20 T Nelson  17 J Q Ni  38 N Nikonov  2 F Nozzoli  3 A Oliva  1 M Orcinha  4 F Palmonari  30   31 C Palomares  1 M Paniccia  7 M Pauluzzi  3   15 S Pensotti  18   19 R Pereira  17 N Picot-Clemente  44 F Pilo  25 C Pizzolotto  3 V Plyaskin  14 M Pohl  7 V Poireau  23 A Putze  23 L Quadrani  30   31 X M Qi  38 X Qin  3 Z Y Qu  32 T Räihä  2 P G Rancoita  18 D Rapin  7 J S Ricol  6 S Rosier-Lees  23 A Rozhkov  14 D Rozza  18 R Sagdeev  45 J Sandweiss  36 P Saouter  7 S Schael  2 S M Schmidt  5 A Schulz von Dratzig  2 G Schwering  2 E S Seo  44 B S Shan  43 J Y Shi  35 T Siedenburg  2 D Son  40 J W Song  28 W H Sun  14 M Tacconi  18 X W Tang  11 Z C Tang  11 L Tao  23 D Tescaro  29 Samuel C C Ting  14   8 S M Ting  14 N Tomassetti  3   15 J Torsti  12 C Türkoğlu  34 T Urban  20 V Vagelli  3   15 E Valente  9   21 C Vannini  25 E Valtonen  12 M Vázquez Acosta  29 M Vecchi  22 M Velasco  1 J P Vialle  23 V Vitale  3 S Vitillo  7 L Q Wang  28 N H Wang  28 Q L Wang  33 X Wang  14 X Q Wang  11 Z X Wang  38 C C Wei  32 Z L Weng  14 K Whitman  17 J Wienkenhöver  2 H Wu  35 X Wu  7 X Xia  1 R Q Xiong  35 W Xu  14 Q Yan  14 J Yang  26 M Yang  11 Y Yang  42 H Yi  35 Y J Yu  33 Z Q Yu  11 S Zeissler  16 C Zhang  11 J Zhang  14 J H Zhang  35 S D Zhang  14 S W Zhang  11 Z Zhang  14 Z M Zheng  43 Z Q Zhu  14 H L Zhuang  11 V Zhukov  2 A Zichichi  30   31 N Zimmermann  2 P Zuccon  14 AMS Collaboration
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Free article

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 et al. Phys Rev Lett. .
Free article

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^{Δ} 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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