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

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 pr...

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Main 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., 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., Cadoux, F., Caroff, S., Casaus, J., Castellini, G., Cernuda, I., Cerreta, D., Cervelli, F., Chae, M. J., Chang, Y. H., Chen, G. M., Chen, H., Chen, H. S., Cheng, L., Chou, H. Y., 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., Eronen, T., Fan, Y. Y., Farnesini, L., Feng, J., Fiandrini, E., Fiasson, A., Finch, E., Formato, V., Galaktionov, Y., Gallucci, G., García, B., García-López, R., Gargiulo, C., Gast, H., Gebauer, I., Gervasi, M., Ghelfi, A., Giovacchini, F., 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., Hoffman, J., 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., La Vacca, G., Laudi, E., Laurenti, G., Lazzizzera, I., Lee, H. T., Lee, S. C., Leluc, C., Li, H. L., Li, J. 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., 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., 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. H., Tacconi, M., Tang, C. P., Tang, X. W., Tang, Z. C., Tao, L., Tescaro, D., Tomassetti, N., Torsti, J., Türkoğlu, C., Urban, T., Vagelli, V., Valente, E., Vannini, C., Valtonen, E., Vecchi, M., Velasco, M., Vialle, J. P., Vitale, V., Vitillo, S., Wang, L. Q., Wang, N. H., Wang, Q. L., Wang, R. S., Wang, Z. X., Whitman, K., Wienkenhöver, J., Wu, H., Wu, X., Xia, X., Xie, M., Xie, S., Xiong, R. Q., Xu, N. S., 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., Behlmann, Matthew Daniel, Cai, Xudong, Choumilov, Evgueni, Choutko, Vitali, Egorov, Alexander, Eline, Alexandre, Goglov, Pavel, Heil, Melanie, Hsieh, Tsai-hsiu, Kounina, Olga, Kounine, Andrei, Koutsenko, Vladimir, Krafczyk, Matthew Scott, Lebedev, Alexei, Plyaskin, Vasily, Rozhkov, Andrey B., Sun, Wei, Ting, Samuel, Vaurynovich, Siarhei S., Wang, Xiaozhen, Weng, Zhili, Willenbrock, Manfred, Xu, Weiwei, Zuccon, Paolo, Li, J. Q., Shi, X. Y., Sun, W. H., Zhang, S. D., Becker, Ulrich J, Burger, Joseph D, Capell, Michael H, Chen, Andrew I, Eppling, Frederic J, Fisher, Peter H, Marks Ting, Susan Carol
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:English
Published: American Physical Society 2015
Online Access:http://hdl.handle.net/1721.1/99947
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author 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.
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.
Cadoux, F.
Caroff, S.
Casaus, J.
Castellini, G.
Cernuda, I.
Cerreta, D.
Cervelli, F.
Chae, M. J.
Chang, Y. H.
Chen, G. M.
Chen, H.
Chen, H. S.
Cheng, L.
Chou, H. Y.
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.
Eronen, T.
Fan, Y. Y.
Farnesini, L.
Feng, J.
Fiandrini, E.
Fiasson, A.
Finch, E.
Formato, V.
Galaktionov, Y.
Gallucci, G.
García, B.
García-López, R.
Gargiulo, C.
Gast, H.
Gebauer, I.
Gervasi, M.
Ghelfi, A.
Giovacchini, F.
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.
Hoffman, J.
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.
La Vacca, G.
Laudi, E.
Laurenti, G.
Lazzizzera, I.
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.
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.
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. H.
Tacconi, M.
Tang, C. P.
Tang, X. W.
Tang, Z. C.
Tao, L.
Tescaro, D.
Tomassetti, N.
Torsti, J.
Türkoğlu, C.
Urban, T.
Vagelli, V.
Valente, E.
Vannini, C.
Valtonen, E.
Vecchi, M.
Velasco, M.
Vialle, J. P.
Vitale, V.
Vitillo, S.
Wang, L. Q.
Wang, N. H.
Wang, Q. L.
Wang, R. S.
Wang, Z. X.
Whitman, K.
Wienkenhöver, J.
Wu, H.
Wu, X.
Xia, X.
Xie, M.
Xie, S.
Xiong, R. Q.
Xu, N. S.
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.
Behlmann, Matthew Daniel
Cai, Xudong
Choumilov, Evgueni
Choutko, Vitali
Egorov, Alexander
Eline, Alexandre
Goglov, Pavel
Heil, Melanie
Hsieh, Tsai-hsiu
Kounina, Olga
Kounine, Andrei
Koutsenko, Vladimir
Krafczyk, Matthew Scott
Lebedev, Alexei
Plyaskin, Vasily
Rozhkov, Andrey B.
Sun, Wei
Ting, Samuel
Vaurynovich, Siarhei S.
Wang, Xiaozhen
Weng, Zhili
Willenbrock, Manfred
Xu, Weiwei
Zuccon, Paolo
Li, J. Q.
Shi, X. Y.
Sun, W. H.
Zhang, S. D.
Becker, Ulrich J
Burger, Joseph D
Capell, Michael H
Chen, Andrew I
Eppling, Frederic J
Fisher, Peter H
Marks Ting, Susan Carol
author2 Massachusetts Institute of Technology. Department of Physics
author_facet Massachusetts Institute of Technology. Department of Physics
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.
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.
Cadoux, F.
Caroff, S.
Casaus, J.
Castellini, G.
Cernuda, I.
Cerreta, D.
Cervelli, F.
Chae, M. J.
Chang, Y. H.
Chen, G. M.
Chen, H.
Chen, H. S.
Cheng, L.
Chou, H. Y.
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.
Eronen, T.
Fan, Y. Y.
Farnesini, L.
Feng, J.
Fiandrini, E.
Fiasson, A.
Finch, E.
Formato, V.
Galaktionov, Y.
Gallucci, G.
García, B.
García-López, R.
Gargiulo, C.
Gast, H.
Gebauer, I.
Gervasi, M.
Ghelfi, A.
Giovacchini, F.
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.
Hoffman, J.
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.
La Vacca, G.
Laudi, E.
Laurenti, G.
Lazzizzera, I.
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.
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.
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. H.
Tacconi, M.
Tang, C. P.
Tang, X. W.
Tang, Z. C.
Tao, L.
Tescaro, D.
Tomassetti, N.
Torsti, J.
Türkoğlu, C.
Urban, T.
Vagelli, V.
Valente, E.
Vannini, C.
Valtonen, E.
Vecchi, M.
Velasco, M.
Vialle, J. P.
Vitale, V.
Vitillo, S.
Wang, L. Q.
Wang, N. H.
Wang, Q. L.
Wang, R. S.
Wang, Z. X.
Whitman, K.
Wienkenhöver, J.
Wu, H.
Wu, X.
Xia, X.
Xie, M.
Xie, S.
Xiong, R. Q.
Xu, N. S.
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.
Behlmann, Matthew Daniel
Cai, Xudong
Choumilov, Evgueni
Choutko, Vitali
Egorov, Alexander
Eline, Alexandre
Goglov, Pavel
Heil, Melanie
Hsieh, Tsai-hsiu
Kounina, Olga
Kounine, Andrei
Koutsenko, Vladimir
Krafczyk, Matthew Scott
Lebedev, Alexei
Plyaskin, Vasily
Rozhkov, Andrey B.
Sun, Wei
Ting, Samuel
Vaurynovich, Siarhei S.
Wang, Xiaozhen
Weng, Zhili
Willenbrock, Manfred
Xu, Weiwei
Zuccon, Paolo
Li, J. Q.
Shi, X. Y.
Sun, W. H.
Zhang, S. D.
Becker, Ulrich J
Burger, Joseph D
Capell, Michael H
Chen, Andrew I
Eppling, Frederic J
Fisher, Peter H
Marks Ting, Susan Carol
author_sort Aguilar, M.
collection MIT
description 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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spelling mit-1721.1/999472023-02-26T08:08:40Z 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 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. 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. Cadoux, F. Caroff, S. Casaus, J. Castellini, G. Cernuda, I. Cerreta, D. Cervelli, F. Chae, M. J. Chang, Y. H. Chen, G. M. Chen, H. Chen, H. S. Cheng, L. Chou, H. Y. 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. Eronen, T. Fan, Y. Y. Farnesini, L. Feng, J. Fiandrini, E. Fiasson, A. Finch, E. Formato, V. Galaktionov, Y. Gallucci, G. García, B. García-López, R. Gargiulo, C. Gast, H. Gebauer, I. Gervasi, M. Ghelfi, A. Giovacchini, F. 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. Hoffman, J. 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. La Vacca, G. Laudi, E. Laurenti, G. Lazzizzera, I. 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. 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. 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. H. Tacconi, M. Tang, C. P. Tang, X. W. Tang, Z. C. Tao, L. Tescaro, D. Tomassetti, N. Torsti, J. Türkoğlu, C. Urban, T. Vagelli, V. Valente, E. Vannini, C. Valtonen, E. Vecchi, M. Velasco, M. Vialle, J. P. Vitale, V. Vitillo, S. Wang, L. Q. Wang, N. H. Wang, Q. L. Wang, R. S. Wang, Z. X. Whitman, K. Wienkenhöver, J. Wu, H. Wu, X. Xia, X. Xie, M. Xie, S. Xiong, R. Q. Xu, N. S. 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. Behlmann, Matthew Daniel Cai, Xudong Choumilov, Evgueni Choutko, Vitali Egorov, Alexander Eline, Alexandre Goglov, Pavel Heil, Melanie Hsieh, Tsai-hsiu Kounina, Olga Kounine, Andrei Koutsenko, Vladimir Krafczyk, Matthew Scott Lebedev, Alexei Plyaskin, Vasily Rozhkov, Andrey B. Sun, Wei Ting, Samuel Vaurynovich, Siarhei S. Wang, Xiaozhen Weng, Zhili Willenbrock, Manfred Xu, Weiwei Zuccon, Paolo Li, J. Q. Shi, X. Y. Sun, W. H. Zhang, S. D. Becker, Ulrich J Burger, Joseph D Capell, Michael H Chen, Andrew I Eppling, Frederic J Fisher, Peter H Marks Ting, Susan Carol Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Becker, Ulrich J. Behlmann, Matthew Daniel Burger, Joseph D. Cai, Xudong Capell, Michael H. Chen, Andrew I. Chen, H. Choumilov, Evgueni Choutko, Vitali Egorov, Alexander Eline, Alexandre Eppling, Frederic J. Fisher, Peter H. Galaktionov, Y. Goglov, Pavel Heil, Melanie Hsieh, Tsai-hsiu Kounina, Olga Kounine, Andrei Koutsenko, Vladimir Krafczyk, Matthew Scott Lebedev, Alexei Li, J. Q. Li, Q. Plyaskin, Vasily Rozhkov, Andrey B. Shi, X. Y. Sun, Wei Sun, W. H. Ting, Samuel Ting, Susan Marks Vaurynovich, Siarhei S. Wang, Xiaozhen Weng, Zhili Willenbrock, Manfred Xie, M. Xu, Weiwei Yan, Q. Zhang, S. D. Zuccon, Paolo 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. 2015-11-20T14:59:54Z 2015-11-20T14:59:54Z 2015-11 2015-08 2015-11-17T23:00:05Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/99947 Aguilar, M., et al. "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." Phys. Rev. Lett. 115, 211101 (November 2015). https://orcid.org/0000-0002-7157-4613 https://orcid.org/0000-0001-7831-7460 https://orcid.org/0000-0002-5000-7150 https://orcid.org/0000-0001-7374-9774 https://orcid.org/0000-0002-2919-9549 https://orcid.org/0000-0003-2249-4542 https://orcid.org/0000-0002-0450-7007 https://orcid.org/0000-0002-6316-0808 https://orcid.org/0000-0003-3513-8408 https://orcid.org/0000-0002-1923-6289 https://orcid.org/0000-0002-8402-3116 https://orcid.org/0000-0002-7172-9021 https://orcid.org/0000-0001-6876-8495 https://orcid.org/0000-0002-2728-0167 https://orcid.org/0000-0002-4436-6077 https://orcid.org/0000-0001-8018-9701 https://orcid.org/0000-0002-8373-3212 https://orcid.org/0000-0002-5006-6847 https://orcid.org/0000-0002-9105-5386 https://orcid.org/0000-0002-4918-5128 https://orcid.org/0000-0002-7216-9206 https://orcid.org/0000-0003-2187-5968 https://orcid.org/0000-0002-8667-5660 https://orcid.org/0000-0002-0236-7274 en http://dx.doi.org/10.1103/PhysRevLett.115.211101 Physical Review Letters Creative Commons Attribution http://creativecommons.org/licenses/by/3.0 authors application/pdf American Physical Society American Physical Society
spellingShingle 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.
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.
Cadoux, F.
Caroff, S.
Casaus, J.
Castellini, G.
Cernuda, I.
Cerreta, D.
Cervelli, F.
Chae, M. J.
Chang, Y. H.
Chen, G. M.
Chen, H.
Chen, H. S.
Cheng, L.
Chou, H. Y.
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.
Eronen, T.
Fan, Y. Y.
Farnesini, L.
Feng, J.
Fiandrini, E.
Fiasson, A.
Finch, E.
Formato, V.
Galaktionov, Y.
Gallucci, G.
García, B.
García-López, R.
Gargiulo, C.
Gast, H.
Gebauer, I.
Gervasi, M.
Ghelfi, A.
Giovacchini, F.
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.
Hoffman, J.
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.
La Vacca, G.
Laudi, E.
Laurenti, G.
Lazzizzera, I.
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.
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.
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. H.
Tacconi, M.
Tang, C. P.
Tang, X. W.
Tang, Z. C.
Tao, L.
Tescaro, D.
Tomassetti, N.
Torsti, J.
Türkoğlu, C.
Urban, T.
Vagelli, V.
Valente, E.
Vannini, C.
Valtonen, E.
Vecchi, M.
Velasco, M.
Vialle, J. P.
Vitale, V.
Vitillo, S.
Wang, L. Q.
Wang, N. H.
Wang, Q. L.
Wang, R. S.
Wang, Z. X.
Whitman, K.
Wienkenhöver, J.
Wu, H.
Wu, X.
Xia, X.
Xie, M.
Xie, S.
Xiong, R. Q.
Xu, N. S.
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.
Behlmann, Matthew Daniel
Cai, Xudong
Choumilov, Evgueni
Choutko, Vitali
Egorov, Alexander
Eline, Alexandre
Goglov, Pavel
Heil, Melanie
Hsieh, Tsai-hsiu
Kounina, Olga
Kounine, Andrei
Koutsenko, Vladimir
Krafczyk, Matthew Scott
Lebedev, Alexei
Plyaskin, Vasily
Rozhkov, Andrey B.
Sun, Wei
Ting, Samuel
Vaurynovich, Siarhei S.
Wang, Xiaozhen
Weng, Zhili
Willenbrock, Manfred
Xu, Weiwei
Zuccon, Paolo
Li, J. Q.
Shi, X. Y.
Sun, W. H.
Zhang, S. D.
Becker, Ulrich J
Burger, Joseph D
Capell, Michael H
Chen, Andrew I
Eppling, Frederic J
Fisher, Peter H
Marks Ting, Susan Carol
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
title 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
title_full 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
title_fullStr 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
title_full_unstemmed 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
title_short 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
title_sort 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
url http://hdl.handle.net/1721.1/99947
https://orcid.org/0000-0002-7157-4613
https://orcid.org/0000-0001-7831-7460
https://orcid.org/0000-0002-5000-7150
https://orcid.org/0000-0001-7374-9774
https://orcid.org/0000-0002-2919-9549
https://orcid.org/0000-0003-2249-4542
https://orcid.org/0000-0002-0450-7007
https://orcid.org/0000-0002-6316-0808
https://orcid.org/0000-0003-3513-8408
https://orcid.org/0000-0002-1923-6289
https://orcid.org/0000-0002-8402-3116
https://orcid.org/0000-0002-7172-9021
https://orcid.org/0000-0001-6876-8495
https://orcid.org/0000-0002-2728-0167
https://orcid.org/0000-0002-4436-6077
https://orcid.org/0000-0001-8018-9701
https://orcid.org/0000-0002-8373-3212
https://orcid.org/0000-0002-5006-6847
https://orcid.org/0000-0002-9105-5386
https://orcid.org/0000-0002-4918-5128
https://orcid.org/0000-0002-7216-9206
https://orcid.org/0000-0003-2187-5968
https://orcid.org/0000-0002-8667-5660
https://orcid.org/0000-0002-0236-7274
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AT zhangjh precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
AT zhangmt precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
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AT zimmermannn precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
AT behlmannmatthewdaniel precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
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AT choutkovitali precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
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AT kouninaolga precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
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AT zucconpaolo precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
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AT sunwh precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
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AT capellmichaelh precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
AT chenandrewi precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
AT epplingfredericj precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
AT fisherpeterh precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation
AT markstingsusancarol precisionmeasurementoftheheliumfluxinprimarycosmicraysofrigidities19gvto3tvwiththealphamagneticspectrometerontheinternationalspacestation