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Cited by 511

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Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station

Open access
Aguilar, M., Aisa, D., Alpat, B., Alvino, A., Ambrosi, G., Andeen, K., Arruda, L., Attig, N., Azzarello, P., Bachlechner, A., Barao, F., Barrau, A., Barrin, L., Bartoloni, A., Basara, L., Battarbee, M., Battiston, R., Bazo, J., Becker, U., Behlmann, M., Beischer, B., Berdugo, J., Bertucci, B., Bindi, V., Bizzaglia, S., Bizzarri, M., Boella, G., de Boer, W., Bollweg, K., Bonnivard, V., Borgia, B., Borsini, S., Boschini, M. J., Bourquin, M., Burger, J., Cadoux, F., Cai, X. D., Capell, M., Caroff, S., Casaus, J., Castellini, G., Cernuda, I., Cerreta, D., Cervelli, F., Chae, M. J., Chang, Y. H., Chen, A. I., Chen, G. M., Chen, H., Chen, H. S., Cheng, L., Chou, H. Y., Choumilov, E., Choutko, V., Chung, C. H., Clark, C., Clavero, R., Coignet, G., Consolandi, C., Contin, A., Corti, C., Gil, E. Cortina, Coste, B., Creus, W., Crispoltoni, M., Cui, Z., Dai, Y. M., Delgado, C., Della Torre, S., Demirköz, M. B., Derome, L., Di Falco, S., Di Masso, L., Dimiccoli, F., Díaz, C., von Doetinchem, P., Donnini, F., Duranti, M., D’Urso, D., Egorov, A., Eline, A., Eppling, F. J., Eronen, T., Fan, Y. Y., Farnesini, L., Feng, J., Fiandrini, E., Fiasson, A., Finch, E., Fisher, P., Formato, V., Galaktionov, Y., Gallucci, G., García, B., García-López, R., Gargiulo, C., Gast, H., Gebauer, I., Gervasi, M., Ghelfi, A., Giovacchini, F., Goglov, P., Gong, J., Goy, C., Grabski, V., Grandi, D., Graziani, M., Guandalini, C., Guerri, I., Guo, K. H., Haas, D., Habiby, M., Haino, S., Han, K. C., He, Z. H., Heil, M., Hoffman, J., Hsieh, T. H., Huang, Z. C., Huh, C., Incagli, M., Ionica, M., Jang, W. Y., Jinchi, H., Kanishev, K., Kim, G. N., Kim, K. S., Kirn, Th., Korkmaz, M. A., Kossakowski, R., Kounina, O., Kounine, A., Koutsenko, V., Krafczyk, M. S., La Vacca, G., Laudi, E., Laurenti, G., Lazzizzera, I., Lebedev, A., Lee, H. T., Lee, S. C., Leluc, C., Li, H. L., Li, J. Q., Li, J. Q., Li, Q., Li, Q., Li, T. X., Li, W., Li, Y., Li, Z. H., Li, Z. Y., Lim, S., Lin, C. H., Lipari, P., Lippert, T., Liu, D., Liu, H., Liu, Hu, Lolli, M., Lomtadze, T., Lu, M. J., Lu, S. Q., Lu, Y. S., Luebelsmeyer, K., Luo, F., Luo, J. Z., Lv, S. S., Majka, R., Mañá, C., Marín, J., Martin, T., Martínez, G., Masi, N., Maurin, D., Menchaca-Rocha, A., Meng, Q., Mo, D. C., Morescalchi, L., Mott, P., Müller, M., Nelson, T., Ni, J. Q., Nikonov, N., Nozzoli, F., Nunes, P., Obermeier, A., Oliva, A., Orcinha, M., Palmonari, F., Palomares, C., Paniccia, M., Papi, A., Pauluzzi, M., Pedreschi, E., Pensotti, S., Pereira, R., Picot-Clemente, N., Pilo, F., Piluso, A., Pizzolotto, C., Plyaskin, V., Pohl, M., Poireau, V., Putze, A., Quadrani, L., Qi, X. M., Qin, X., Qu, Z. Y., Räihä, T., Rancoita, P. G., Rapin, D., Ricol, J. S., Rodríguez, I., Rosier-Lees, S., Rozhkov, A., Rozza, D., Sagdeev, R., Sandweiss, J., Saouter, P., Schael, S., Schmidt, S. M., von Dratzig, A. Schulz, Schwering, G., Scolieri, G., Seo, E. S., Shan, B. S., Shan, Y. H., Shi, J. Y., Shi, X. Y., Shi, Y. M., Siedenburg, T., Son, D., Song, J. W., Spada, F., Spinella, F., Sun, W., Sun, W. H., Tacconi, M., Tang, C. P., Tang, X. W., Tang, Z. C., Tao, L., Tescaro, D., Ting, Samuel C. C., Ting, S. M., Tomassetti, N., Torsti, J., Türkoğlu, C., Urban, T., Vagelli, V., Valente, E., Vannini, C., Valtonen, E., Vaurynovich, S., Vecchi, M., Velasco, M., Vialle, J. P., Vitale, V., Vitillo, S., Wang, L. Q., Wang, N. H., Wang, Q. L., Wang, R. S., Wang, X., Wang, Z. X., Weng, Z. L., Whitman, K., Wienkenhöver, J., Willenbrock, M., Wu, H., Wu, X., Xia, X., Xie, M., Xie, S., Xiong, R. Q., Xu, N. S., Xu, W., Yan, Q., Yang, J., Yang, M., Yang, Y., Ye, Q. H., Yi, H., Yu, Y. J., Yu, Z. Q., Zeissler, S., Zhang, C., Zhang, J. H., Zhang, M. T., Zhang, S. D., Zhang, S. W., Zhang, X. B., Zhang, Z., Zheng, Z. M., Zhuang, H. L., Zhukov, V., Zichichi, A., Zimmermann, N., Zuccon, P., AMS Collaboration·2015·Physical Review Letters

Abstract

Knowledge of the precise rigidity dependence of the helium flux is important in understanding the origin, acceleration, and propagation of cosmic rays. A precise measurement of the helium flux in primary cosmic rays with rigidity (momentum/charge) from 1.9 GV to 3 TV based on 50 million events is presented and compared to the proton flux. The detailed variation with rigidity of the helium flux spectral index is presented for the first time. The spectral index progressively hardens at rigidities larger than 100 GV. The rigidity dependence of the helium flux spectral index is similar to that of the proton spectral index though the magnitudes are different. Remarkably, the spectral index of the proton to helium flux ratio increases with rigidity up to 45 GV and then becomes constant; the flux ratio above 45 GV is well described by a single power law.

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Authors
Aguilar, M., Aisa, D., Alpat, B., Alvino, A., Ambrosi, G., Andeen, K., Arruda, L., Attig, N., Azzarello, P., Bachlechner, A., Barao, F., Barrau, A., Barrin, L., Bartoloni, A., Basara, L., Battarbee, M., Battiston, R., Bazo, J., Becker, U., Behlmann, M., Beischer, B., Berdugo, J., Bertucci, B., Bindi, V., Bizzaglia, S., Bizzarri, M., Boella, G., de Boer, W., Bollweg, K., Bonnivard, V., Borgia, B., Borsini, S., Boschini, M. J., Bourquin, M., Burger, J., Cadoux, F., Cai, X. D., Capell, M., Caroff, S., Casaus, J., Castellini, G., Cernuda, I., Cerreta, D., Cervelli, F., Chae, M. J., Chang, Y. H., Chen, A. I., Chen, G. M., Chen, H., Chen, H. S., Cheng, L., Chou, H. Y., Choumilov, E., Choutko, V., Chung, C. H., Clark, C., Clavero, R., Coignet, G., Consolandi, C., Contin, A., Corti, C., Gil, E. C., Coste, B., Creus, W., Crispoltoni, M., Cui, Z., Dai, Y. M., Delgado, C., Della Torre, S., Demirköz, M. B., Derome, L., Di Falco, S., Di Masso, L., Dimiccoli, F., Díaz, C., von Doetinchem, P., Donnini, F., Duranti, M., D’Urso, D., Egorov, A., Eline, A., Eppling, F. J., Eronen, T., Fan, Y. Y., Farnesini, L., Feng, J., Fiandrini, E., Fiasson, A., Finch, E., Fisher, P., Formato, V., Galaktionov, Y., Gallucci, G., García, B., García-López, R., Gargiulo, C., Gast, H., Gebauer, I., Gervasi, M., Ghelfi, A., Giovacchini, F., Goglov, P., Gong, J., Goy, C., Grabski, V., Grandi, D., Graziani, M., Guandalini, C., Guerri, I., Guo, K. H., Haas, D., Habiby, M., Haino, S., Han, K. C., He, Z. H., Heil, M., Hoffman, J., Hsieh, T. H., Huang, Z. C., Huh, C., Incagli, M., Ionica, M., Jang, W. Y., Jinchi, H., Kanishev, K., Kim, G. N., Kim, K. S., Kirn, T., Korkmaz, M. A., Kossakowski, R., Kounina, O., Kounine, A., Koutsenko, V., Krafczyk, M. S., La Vacca, G., Laudi, E., Laurenti, G., Lazzizzera, I., Lebedev, A., Lee, H. T., Lee, S. C., Leluc, C., Li, H. L., Li, J. Q., Li, J. Q., Li, Q., Li, Q., Li, T. X., Li, W., Li, Y., Li, Z. H., Li, Z. Y., Lim, S., Lin, C. H., Lipari, P., Lippert, T., Liu, D., Liu, H., Liu, H., Lolli, M., Lomtadze, T., Lu, M. J., Lu, S. Q., Lu, Y. S., Luebelsmeyer, K., Luo, F., Luo, J. Z., Lv, S. S., Majka, R., Mañá, C., Marín, J., Martin, T., Martínez, G., Masi, N., Maurin, D., Menchaca-Rocha, A., Meng, Q., Mo, D. C., Morescalchi, L., Mott, P., Müller, M., Nelson, T., Ni, J. Q., Nikonov, N., Nozzoli, F., Nunes, P., Obermeier, A., Oliva, A., Orcinha, M., Palmonari, F., Palomares, C., Paniccia, M., Papi, A., Pauluzzi, M., Pedreschi, E., Pensotti, S., Pereira, R., Picot-Clemente, N., Pilo, F., Piluso, A., Pizzolotto, C., Plyaskin, V., Pohl, M., Poireau, V., Putze, A., Quadrani, L., Qi, X. M., Qin, X., Qu, Z. Y., Räihä, T., Rancoita, P. G., Rapin, D., Ricol, J. S., Rodríguez, I., Rosier-Lees, S., Rozhkov, A., Rozza, D., Sagdeev, R., Sandweiss, J., Saouter, P., Schael, S., Schmidt, S. M., von Dratzig, A. S., Schwering, G., Scolieri, G., Seo, E. S., Shan, B. S., Shan, Y. H., Shi, J. Y., Shi, X. Y., Shi, Y. M., Siedenburg, T., Son, D., Song, J. W., Spada, F., Spinella, F., Sun, W., Sun, W. H., Tacconi, M., Tang, C. P., Tang, X. W., Tang, Z. C., Tao, L., Tescaro, D., Ting, S. C. C., Ting, S. M., Tomassetti, N., Torsti, J., Türkoğlu, C., Urban, T., Vagelli, V., Valente, E., Vannini, C., Valtonen, E., Vaurynovich, S., Vecchi, M., Velasco, M., Vialle, J. P., Vitale, V., Vitillo, S., Wang, L. Q., Wang, N. H., Wang, Q. L., Wang, R. S., Wang, X., Wang, Z. X., Weng, Z. L., Whitman, K., Wienkenhöver, J., Willenbrock, M., Wu, H., Wu, X., Xia, X., Xie, M., Xie, S., Xiong, R. Q., Xu, N. S., Xu, W., Yan, Q., Yang, J., Yang, M., Yang, Y., Ye, Q. H., Yi, H., Yu, Y. J., Yu, Z. Q., Zeissler, S., Zhang, C., Zhang, J. H., Zhang, M. T., Zhang, S. D., Zhang, S. W., Zhang, X. B., Zhang, Z., Zheng, Z. M., Zhuang, H. L., Zhukov, V., Zichichi, A., Zimmermann, N., Zuccon, P., & AMS Collaboration
Venue
Physical Review Letters
Published
2015-11-17
Volume
115
Issue
21
Pages
211101-211101
ISSN
  • 0031-9007 (ISSN-L)
  • 1079-7114
OpenAlex
W2252702481
Cited by
511
References
1
FWCI
28.42
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station. https://app.cochat.ai/papers/10.1103/physrevlett.115.211101
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Aguilar, M., Aisa, D., Alpat, B., Alvino, A., Ambrosi, G., Andeen, K., Arruda, L., Attig, N., Azzarello, P., Bachlechner, A., Barao, F., Barrau, A., Barrin, L., Bartoloni, A., Basara, L., Battarbee, M., Battiston, R., Bazo, J., Becker, U., . . . AMS Collaboration. (2015). Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station. Physical Review Letters. https://doi.org/10.1103/physrevlett.115.211101

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