Towards Understanding the Origin of Cosmic-Ray Positrons

M. Aguilar, L. Ali Cavasonza, G. Ambrosi, L. Arruda, N. Attig, P. Azzarello, A. Bachlechner, F. Barao, A. Barrau, L. Barrin, A. Bartoloni, L. Basara, S. Başeǧmez-Du Pree, R. Battiston, U. Becker, M. Behlmann, B. Beischer, J. Berdugo, B. Bertucci, V. Bindi & 207 others W. De Boer, K. Bollweg, B. Borgia, M. J. Boschini, M. Bourquin, E. F. Bueno, J. Burger, W. J. Burger, X. D. Cai, M. Capell, S. Caroff, J. Casaus, G. Castellini, F. Cervelli, Y. H. Chang, G. M. Chen, H. S. Chen, Y. Chen, L. Cheng, H. Y. Chou, V. Choutko, C. H. Chung, C. Clark, G. Coignet, C. Consolandi, A. Contin, C. Corti, M. Crispoltoni, Z. Cui, K. Dadzie, Y. M. Dai, A. Datta, C. Delgado, S. Della Torre, M. B. Demirköz, L. Derome, S. Di Falco, F. Dimiccoli, C. Díaz, P. Von Doetinchem, F. Dong, F. Donnini, M. Duranti, A. Egorov, A. Eline, T. Eronen, J. Feng, E. Fiandrini, P. Fisher, V. Formato, Y. Galaktionov, R. J. García-López, C. Gargiulo, H. Gast, I. Gebauer, M. Gervasi, F. Giovacchini, 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, T. H. Hsieh, H. Huang, Z. C. Huang, M. Incagli, Yi Jia, H. Jinchi, K. Kanishev, B. Khiali, Th Kirn, C. Konak, O. Kounina, A. Kounine, V. Koutsenko, A. Kulemzin, G. La Vacca, E. Laudi, G. Laurenti, I. Lazzizzera, A. Lebedev, H. T. Lee, S. C. Lee, C. Leluc, J. Q. Li, Q. Li, T. X. Li, Z. H. Li, C. Light, C. H. Lin, T. Lippert, F. Z. Liu, Hu Liu, Z. Liu, S. Q. Lu, Y. S. Lu, K. Luebelsmeyer, F. Luo, J. Z. Luo, Xi Luo, S. S. Lyu, F. MacHate, C. Mañá, J. Marín, T. Martin, G. Martínez, N. Masi, D. Maurin, A. Menchaca-Rocha, Q. Meng, D. C. Mo, M. Molero, P. Mott, L. Mussolin, T. Nelson, J. Q. Ni, N. Nikonov, F. Nozzoli, A. Oliva, M. Orcinha, M. Palermo, F. Palmonari, M. Paniccia, A. Pashnin, M. Pauluzzi, S. Pensotti, C. Perrina, H. D. Phan, N. Picot-Clemente, V. Plyaskin, M. Pohl, V. Poireau, A. Popkow, L. Quadrani, X. M. Qi, X. Qin, Z. Y. Qu, P. G. Rancoita, D. Rapin, A. Reina Conde, S. Rosier-Lees, A. Rozhkov, D. Rozza, R. Sagdeev, C. Solano, S. Schael, S. M. Schmidt, A. Schulz Von Dratzig, G. Schwering, E. S. Seo, B. S. Shan, J. Y. Shi, T. Siedenburg, J. W. Song, Z. T. Sun, M. Tacconi, X. W. Tang, Z. C. Tang, J. Tian, Samuel C.C. Ting, S. M. Ting, N. Tomassetti, J. Torsti, T. Urban, V. Vagelli, E. Valente, E. Valtonen, M. Vázquez Acosta, M. Vecchi, M. Velasco, J. P. Vialle, J. Vizán, L. Q. Wang, N. H. Wang, Q. L. Wang, X. Wang, X. Q. Wang, Z. X. Wang, J. Wei, Z. L. Weng, H. Wu, R. Q. Xiong, W. Xu, Q. Yan, Yi Yang, H. Yi, Y. J. Yu, Z. Q. Yu, M. Zannoni, S. Zeissler, C. Zhang, F. Zhang, J. H. Zhang, Z. Zhang, F. Zhao, Z. M. Zheng, H. L. Zhuang, V. Zhukov, A. Zichichi, N. Zimmermann, P. Zuccon

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Precision measurements of cosmic ray positrons are presented up to 1 TeV based on 1.9 million positrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence. Its distinctive properties are (a) a significant excess starting from 25.2±1.8 GeV compared to the lower-energy, power-law trend, (b) a sharp dropoff above 284-64+91 GeV, (c) in the entire energy range the positron flux is well described by the sum of a term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term of positrons, which dominates at high energies, and (d) a finite energy cutoff of the source term of Es=810-180+310 GeV is established with a significance of more than 4σ. These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter annihilation or from other astrophysical sources.

Original languageEnglish
Article number041102
JournalPhysical review letters
Volume122
Issue number4
DOIs
Publication statusPublished - 2019 Jan 1

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cosmic rays
positrons
energy
Alpha Magnetic Spectrometer
International Space Station
dark matter
astrophysics
cut-off
trends
collisions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Aguilar, M., Ali Cavasonza, L., Ambrosi, G., Arruda, L., Attig, N., Azzarello, P., ... Zuccon, P. (2019). Towards Understanding the Origin of Cosmic-Ray Positrons. Physical review letters, 122(4), [041102]. https://doi.org/10.1103/PhysRevLett.122.041102
Aguilar, M. ; Ali Cavasonza, L. ; Ambrosi, G. ; Arruda, L. ; Attig, N. ; Azzarello, P. ; Bachlechner, A. ; Barao, F. ; Barrau, A. ; Barrin, L. ; Bartoloni, A. ; Basara, L. ; Başeǧmez-Du Pree, S. ; Battiston, R. ; Becker, U. ; Behlmann, M. ; Beischer, B. ; Berdugo, J. ; Bertucci, B. ; Bindi, V. ; De Boer, W. ; Bollweg, K. ; Borgia, B. ; Boschini, M. J. ; Bourquin, M. ; Bueno, E. F. ; Burger, J. ; Burger, W. J. ; Cai, X. D. ; Capell, M. ; Caroff, S. ; Casaus, J. ; Castellini, G. ; Cervelli, F. ; Chang, Y. H. ; Chen, G. M. ; Chen, H. S. ; Chen, Y. ; Cheng, L. ; Chou, H. Y. ; Choutko, V. ; Chung, C. H. ; Clark, C. ; Coignet, G. ; Consolandi, C. ; Contin, A. ; Corti, C. ; Crispoltoni, M. ; Cui, Z. ; Dadzie, K. ; Dai, Y. M. ; Datta, A. ; Delgado, C. ; Della Torre, S. ; Demirköz, M. B. ; Derome, L. ; Di Falco, S. ; Dimiccoli, F. ; Díaz, C. ; Von Doetinchem, P. ; Dong, F. ; Donnini, F. ; Duranti, M. ; Egorov, A. ; Eline, A. ; Eronen, T. ; Feng, J. ; Fiandrini, E. ; Fisher, P. ; Formato, V. ; Galaktionov, Y. ; García-López, R. J. ; Gargiulo, C. ; Gast, H. ; Gebauer, I. ; Gervasi, M. ; Giovacchini, F. ; Gómez-Coral, D. M. ; Gong, J. ; Goy, C. ; Grabski, V. ; Grandi, D. ; Graziani, M. ; Guo, K. H. ; Haino, S. ; Han, K. C. ; He, Z. H. ; Heil, M. ; Hsieh, T. H. ; Huang, H. ; Huang, Z. C. ; Incagli, M. ; Jia, Yi ; Jinchi, H. ; Kanishev, K. ; Khiali, B. ; Kirn, Th ; Konak, C. ; Kounina, O. ; Kounine, A. ; Koutsenko, V. ; Kulemzin, A. ; La Vacca, G. ; Laudi, E. ; Laurenti, G. ; Lazzizzera, I. ; Lebedev, A. ; Lee, H. T. ; Lee, S. C. ; Leluc, C. ; Li, J. Q. ; Li, Q. ; Li, T. X. ; Li, Z. H. ; Light, C. ; Lin, C. H. ; Lippert, T. ; Liu, F. Z. ; Liu, Hu ; Liu, Z. ; Lu, S. Q. ; Lu, Y. S. ; Luebelsmeyer, K. ; Luo, F. ; Luo, J. Z. ; Luo, Xi ; Lyu, S. S. ; MacHate, F. ; Mañá, C. ; Marín, J. ; Martin, T. ; Martínez, G. ; Masi, N. ; Maurin, D. ; Menchaca-Rocha, A. ; Meng, Q. ; Mo, D. C. ; Molero, M. ; Mott, P. ; Mussolin, L. ; Nelson, T. ; Ni, J. Q. ; Nikonov, N. ; Nozzoli, F. ; Oliva, A. ; Orcinha, M. ; Palermo, M. ; Palmonari, F. ; Paniccia, M. ; Pashnin, A. ; Pauluzzi, M. ; Pensotti, S. ; Perrina, C. ; Phan, H. D. ; Picot-Clemente, N. ; Plyaskin, V. ; Pohl, M. ; Poireau, V. ; Popkow, A. ; Quadrani, L. ; Qi, X. M. ; Qin, X. ; Qu, Z. Y. ; Rancoita, P. G. ; Rapin, D. ; Conde, A. Reina ; Rosier-Lees, S. ; Rozhkov, A. ; Rozza, D. ; Sagdeev, R. ; Solano, C. ; Schael, S. ; Schmidt, S. M. ; Schulz Von Dratzig, A. ; Schwering, G. ; Seo, E. S. ; Shan, B. S. ; Shi, J. Y. ; Siedenburg, T. ; Song, J. W. ; Sun, Z. T. ; Tacconi, M. ; Tang, X. W. ; Tang, Z. C. ; Tian, J. ; Ting, Samuel C.C. ; Ting, S. M. ; Tomassetti, N. ; Torsti, J. ; Urban, T. ; Vagelli, V. ; Valente, E. ; Valtonen, E. ; Vázquez Acosta, M. ; Vecchi, M. ; Velasco, M. ; Vialle, J. P. ; Vizán, J. ; Wang, L. Q. ; Wang, N. H. ; Wang, Q. L. ; Wang, X. ; Wang, X. Q. ; Wang, Z. X. ; Wei, J. ; Weng, Z. L. ; Wu, H. ; Xiong, R. Q. ; Xu, W. ; Yan, Q. ; Yang, Yi ; Yi, H. ; Yu, Y. J. ; Yu, Z. Q. ; Zannoni, M. ; Zeissler, S. ; Zhang, C. ; Zhang, F. ; Zhang, J. H. ; Zhang, Z. ; Zhao, F. ; Zheng, Z. M. ; Zhuang, H. L. ; Zhukov, V. ; Zichichi, A. ; Zimmermann, N. ; Zuccon, P. / Towards Understanding the Origin of Cosmic-Ray Positrons. In: Physical review letters. 2019 ; Vol. 122, No. 4.
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title = "Towards Understanding the Origin of Cosmic-Ray Positrons",
abstract = "Precision measurements of cosmic ray positrons are presented up to 1 TeV based on 1.9 million positrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence. Its distinctive properties are (a) a significant excess starting from 25.2±1.8 GeV compared to the lower-energy, power-law trend, (b) a sharp dropoff above 284-64+91 GeV, (c) in the entire energy range the positron flux is well described by the sum of a term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term of positrons, which dominates at high energies, and (d) a finite energy cutoff of the source term of Es=810-180+310 GeV is established with a significance of more than 4σ. These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter annihilation or from other astrophysical sources.",
author = "M. Aguilar and {Ali Cavasonza}, L. and G. Ambrosi and L. Arruda and N. Attig and P. Azzarello and A. Bachlechner and F. Barao and A. Barrau and L. Barrin and A. Bartoloni and L. Basara and {Başeǧmez-Du Pree}, S. and R. Battiston and U. Becker and M. Behlmann and B. Beischer and J. Berdugo and B. Bertucci and V. Bindi and {De Boer}, W. and K. Bollweg and B. Borgia and Boschini, {M. J.} and M. Bourquin and Bueno, {E. F.} and J. Burger and Burger, {W. J.} and Cai, {X. D.} and M. Capell and S. Caroff and J. Casaus and G. Castellini and F. Cervelli and Chang, {Y. H.} and Chen, {G. M.} and Chen, {H. S.} and Y. Chen and L. Cheng and Chou, {H. Y.} and V. Choutko and Chung, {C. H.} and C. Clark and G. Coignet and C. Consolandi and A. Contin and C. Corti and M. Crispoltoni and Z. Cui and K. Dadzie and Dai, {Y. M.} and A. Datta and C. Delgado and {Della Torre}, S. and Demirk{\"o}z, {M. B.} and L. Derome and {Di Falco}, S. and F. Dimiccoli and C. D{\'i}az and {Von Doetinchem}, P. and F. Dong and F. Donnini and M. Duranti and A. Egorov and A. Eline and T. Eronen and J. Feng and E. Fiandrini and P. Fisher and V. Formato and Y. Galaktionov and Garc{\'i}a-L{\'o}pez, {R. J.} and C. Gargiulo and H. Gast and I. Gebauer and M. Gervasi and F. Giovacchini and G{\'o}mez-Coral, {D. M.} and J. Gong and C. Goy and V. Grabski and D. Grandi and M. Graziani and Guo, {K. H.} and S. Haino and Han, {K. C.} and He, {Z. H.} and M. Heil and Hsieh, {T. H.} and H. Huang and Huang, {Z. C.} and M. Incagli and Yi Jia and H. Jinchi and K. Kanishev and B. Khiali and Th Kirn and C. Konak and O. Kounina and A. Kounine and V. Koutsenko and A. Kulemzin and {La Vacca}, G. and E. Laudi and G. Laurenti and I. Lazzizzera and A. Lebedev and Lee, {H. T.} and Lee, {S. C.} and C. Leluc and Li, {J. Q.} and Q. Li and Li, {T. X.} and Li, {Z. H.} and C. Light and Lin, {C. H.} and T. Lippert and Liu, {F. Z.} and Hu Liu and Z. Liu and Lu, {S. Q.} and Lu, {Y. S.} and K. Luebelsmeyer and F. Luo and Luo, {J. Z.} and Xi Luo and Lyu, {S. S.} and F. MacHate and C. Ma{\~n}{\'a} and J. Mar{\'i}n and T. Martin and G. Mart{\'i}nez and N. Masi and D. Maurin and A. Menchaca-Rocha and Q. Meng and Mo, {D. C.} and M. Molero and P. Mott and L. Mussolin and T. Nelson and Ni, {J. Q.} and N. Nikonov and F. Nozzoli and A. Oliva and M. Orcinha and M. Palermo and F. Palmonari and M. Paniccia and A. Pashnin and M. Pauluzzi and S. Pensotti and C. Perrina and Phan, {H. D.} and N. Picot-Clemente and V. Plyaskin and M. Pohl and V. Poireau and A. Popkow and L. Quadrani and Qi, {X. M.} and X. Qin and Qu, {Z. Y.} and Rancoita, {P. G.} and D. Rapin and Conde, {A. Reina} and S. Rosier-Lees and A. Rozhkov and D. Rozza and R. Sagdeev and C. Solano and S. Schael and Schmidt, {S. M.} and {Schulz Von Dratzig}, A. and G. Schwering and Seo, {E. S.} and Shan, {B. S.} and Shi, {J. Y.} and T. Siedenburg and Song, {J. W.} and Sun, {Z. T.} and M. Tacconi and Tang, {X. W.} and Tang, {Z. C.} and J. Tian and Ting, {Samuel C.C.} and Ting, {S. M.} and N. Tomassetti and J. Torsti and T. Urban and V. Vagelli and E. Valente and E. Valtonen and {V{\'a}zquez Acosta}, M. and M. Vecchi and M. Velasco and Vialle, {J. P.} and J. Viz{\'a}n and Wang, {L. Q.} and Wang, {N. H.} and Wang, {Q. L.} and X. Wang and Wang, {X. Q.} and Wang, {Z. X.} and J. Wei and Weng, {Z. L.} and H. Wu and Xiong, {R. Q.} and W. Xu and Q. Yan and Yi Yang and H. Yi and Yu, {Y. J.} and Yu, {Z. Q.} and M. Zannoni and S. Zeissler and C. Zhang and F. Zhang and Zhang, {J. H.} and Z. Zhang and F. Zhao and Zheng, {Z. M.} and Zhuang, {H. L.} and V. Zhukov and A. Zichichi and N. Zimmermann and P. Zuccon",
year = "2019",
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doi = "10.1103/PhysRevLett.122.041102",
language = "English",
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Aguilar, M, Ali Cavasonza, L, Ambrosi, G, Arruda, L, Attig, N, Azzarello, P, Bachlechner, A, Barao, F, Barrau, A, Barrin, L, Bartoloni, A, Basara, L, Başeǧmez-Du Pree, S, Battiston, R, Becker, U, Behlmann, M, Beischer, B, Berdugo, J, Bertucci, B, Bindi, V, De Boer, W, Bollweg, K, Borgia, B, Boschini, MJ, Bourquin, M, Bueno, EF, Burger, J, Burger, WJ, Cai, XD, Capell, M, Caroff, S, Casaus, J, Castellini, G, Cervelli, F, Chang, YH, Chen, GM, Chen, HS, Chen, Y, Cheng, L, Chou, HY, Choutko, V, Chung, CH, Clark, C, Coignet, G, Consolandi, C, Contin, A, Corti, C, Crispoltoni, M, Cui, Z, Dadzie, K, Dai, YM, Datta, A, Delgado, C, Della Torre, S, Demirköz, MB, Derome, L, Di Falco, S, Dimiccoli, F, Díaz, C, Von Doetinchem, P, Dong, F, Donnini, F, Duranti, M, Egorov, A, Eline, A, Eronen, T, Feng, J, Fiandrini, E, Fisher, P, Formato, V, Galaktionov, Y, García-López, RJ, Gargiulo, C, Gast, H, Gebauer, I, Gervasi, M, Giovacchini, F, Gómez-Coral, DM, Gong, J, Goy, C, Grabski, V, Grandi, D, Graziani, M, Guo, KH, Haino, S, Han, KC, He, ZH, Heil, M, Hsieh, TH, Huang, H, Huang, ZC, Incagli, M, Jia, Y, Jinchi, H, Kanishev, K, Khiali, B, Kirn, T, Konak, C, Kounina, O, Kounine, A, Koutsenko, V, Kulemzin, A, La Vacca, G, Laudi, E, Laurenti, G, Lazzizzera, I, Lebedev, A, Lee, HT, Lee, SC, Leluc, C, Li, JQ, Li, Q, Li, TX, Li, ZH, Light, C, Lin, CH, Lippert, T, Liu, FZ, Liu, H, Liu, Z, Lu, SQ, Lu, YS, Luebelsmeyer, K, Luo, F, Luo, JZ, Luo, X, Lyu, SS, MacHate, F, Mañá, C, Marín, J, Martin, T, Martínez, G, Masi, N, Maurin, D, Menchaca-Rocha, A, Meng, Q, Mo, DC, Molero, M, Mott, P, Mussolin, L, Nelson, T, Ni, JQ, Nikonov, N, Nozzoli, F, Oliva, A, Orcinha, M, Palermo, M, Palmonari, F, Paniccia, M, Pashnin, A, Pauluzzi, M, Pensotti, S, Perrina, C, Phan, HD, Picot-Clemente, N, Plyaskin, V, Pohl, M, Poireau, V, Popkow, A, Quadrani, L, Qi, XM, Qin, X, Qu, ZY, Rancoita, PG, Rapin, D, Conde, AR, Rosier-Lees, S, Rozhkov, A, Rozza, D, Sagdeev, R, Solano, C, Schael, S, Schmidt, SM, Schulz Von Dratzig, A, Schwering, G, Seo, ES, Shan, BS, Shi, JY, Siedenburg, T, Song, JW, Sun, ZT, Tacconi, M, Tang, XW, Tang, ZC, Tian, J, Ting, SCC, Ting, SM, Tomassetti, N, Torsti, J, Urban, T, Vagelli, V, Valente, E, Valtonen, E, Vázquez Acosta, M, Vecchi, M, Velasco, M, Vialle, JP, Vizán, J, Wang, LQ, Wang, NH, Wang, QL, Wang, X, Wang, XQ, Wang, ZX, Wei, J, Weng, ZL, Wu, H, Xiong, RQ, Xu, W, Yan, Q, Yang, Y, Yi, H, Yu, YJ, Yu, ZQ, Zannoni, M, Zeissler, S, Zhang, C, Zhang, F, Zhang, JH, Zhang, Z, Zhao, F, Zheng, ZM, Zhuang, HL, Zhukov, V, Zichichi, A, Zimmermann, N & Zuccon, P 2019, 'Towards Understanding the Origin of Cosmic-Ray Positrons', Physical review letters, vol. 122, no. 4, 041102. https://doi.org/10.1103/PhysRevLett.122.041102

Towards Understanding the Origin of Cosmic-Ray Positrons. / Aguilar, M.; Ali Cavasonza, L.; Ambrosi, G.; Arruda, L.; Attig, N.; Azzarello, P.; Bachlechner, A.; Barao, F.; Barrau, A.; Barrin, L.; Bartoloni, A.; Basara, L.; Başeǧmez-Du Pree, S.; Battiston, R.; Becker, U.; Behlmann, M.; Beischer, B.; Berdugo, J.; Bertucci, B.; Bindi, V.; De Boer, W.; Bollweg, K.; Borgia, B.; Boschini, M. J.; Bourquin, M.; Bueno, E. F.; Burger, J.; Burger, W. J.; Cai, X. D.; Capell, M.; Caroff, S.; Casaus, J.; Castellini, G.; Cervelli, F.; Chang, Y. H.; Chen, G. M.; Chen, H. S.; Chen, Y.; Cheng, L.; Chou, H. Y.; Choutko, V.; Chung, C. H.; Clark, C.; Coignet, G.; Consolandi, C.; Contin, A.; Corti, C.; Crispoltoni, M.; Cui, Z.; Dadzie, K.; Dai, Y. M.; Datta, A.; Delgado, C.; Della Torre, S.; Demirköz, M. B.; Derome, L.; Di Falco, S.; Dimiccoli, F.; Díaz, C.; Von Doetinchem, P.; Dong, F.; Donnini, F.; Duranti, M.; Egorov, A.; Eline, A.; Eronen, T.; Feng, J.; Fiandrini, E.; Fisher, P.; Formato, V.; Galaktionov, Y.; García-López, R. J.; Gargiulo, C.; Gast, H.; Gebauer, I.; Gervasi, M.; Giovacchini, F.; Gómez-Coral, D. M.; Gong, J.; Goy, C.; Grabski, V.; Grandi, D.; Graziani, M.; Guo, K. H.; Haino, S.; Han, K. C.; He, Z. H.; Heil, M.; Hsieh, T. H.; Huang, H.; Huang, Z. C.; Incagli, M.; Jia, Yi; Jinchi, H.; Kanishev, K.; Khiali, B.; Kirn, Th; Konak, C.; Kounina, O.; Kounine, A.; Koutsenko, V.; Kulemzin, A.; La Vacca, G.; Laudi, E.; Laurenti, G.; Lazzizzera, I.; Lebedev, A.; Lee, H. T.; Lee, S. C.; Leluc, C.; Li, J. Q.; Li, Q.; Li, T. X.; Li, Z. H.; Light, C.; Lin, C. H.; Lippert, T.; Liu, F. Z.; Liu, Hu; Liu, Z.; Lu, S. Q.; Lu, Y. S.; Luebelsmeyer, K.; Luo, F.; Luo, J. Z.; Luo, Xi; Lyu, S. S.; MacHate, F.; Mañá, C.; Marín, J.; Martin, T.; Martínez, G.; Masi, N.; Maurin, D.; Menchaca-Rocha, A.; Meng, Q.; Mo, D. C.; Molero, M.; Mott, P.; Mussolin, L.; Nelson, T.; Ni, J. Q.; Nikonov, N.; Nozzoli, F.; Oliva, A.; Orcinha, M.; Palermo, M.; Palmonari, F.; Paniccia, M.; Pashnin, A.; Pauluzzi, M.; Pensotti, S.; Perrina, C.; Phan, H. D.; Picot-Clemente, N.; Plyaskin, V.; Pohl, M.; Poireau, V.; Popkow, A.; Quadrani, L.; Qi, X. M.; Qin, X.; Qu, Z. Y.; Rancoita, P. G.; Rapin, D.; Conde, A. Reina; Rosier-Lees, S.; Rozhkov, A.; Rozza, D.; Sagdeev, R.; Solano, C.; Schael, S.; Schmidt, S. M.; Schulz Von Dratzig, A.; Schwering, G.; Seo, E. S.; Shan, B. S.; Shi, J. Y.; Siedenburg, T.; Song, J. W.; Sun, Z. T.; Tacconi, M.; Tang, X. W.; Tang, Z. C.; Tian, J.; Ting, Samuel C.C.; Ting, S. M.; Tomassetti, N.; Torsti, J.; Urban, T.; Vagelli, V.; Valente, E.; Valtonen, E.; Vázquez Acosta, M.; Vecchi, M.; Velasco, M.; Vialle, J. P.; Vizán, J.; Wang, L. Q.; Wang, N. H.; Wang, Q. L.; Wang, X.; Wang, X. Q.; Wang, Z. X.; Wei, J.; Weng, Z. L.; Wu, H.; Xiong, R. Q.; Xu, W.; Yan, Q.; Yang, Yi; Yi, H.; Yu, Y. J.; Yu, Z. Q.; Zannoni, M.; Zeissler, S.; Zhang, C.; Zhang, F.; Zhang, J. H.; Zhang, Z.; Zhao, F.; Zheng, Z. M.; Zhuang, H. L.; Zhukov, V.; Zichichi, A.; Zimmermann, N.; Zuccon, P.

In: Physical review letters, Vol. 122, No. 4, 041102, 01.01.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Towards Understanding the Origin of Cosmic-Ray Positrons

AU - Aguilar, M.

AU - Ali Cavasonza, L.

AU - Ambrosi, G.

AU - Arruda, L.

AU - Attig, N.

AU - Azzarello, P.

AU - Bachlechner, A.

AU - Barao, F.

AU - Barrau, A.

AU - Barrin, L.

AU - Bartoloni, A.

AU - Basara, L.

AU - Başeǧmez-Du Pree, S.

AU - Battiston, R.

AU - Becker, U.

AU - Behlmann, M.

AU - Beischer, B.

AU - Berdugo, J.

AU - Bertucci, B.

AU - Bindi, V.

AU - De Boer, W.

AU - Bollweg, K.

AU - Borgia, B.

AU - Boschini, M. J.

AU - Bourquin, M.

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PY - 2019/1/1

Y1 - 2019/1/1

N2 - Precision measurements of cosmic ray positrons are presented up to 1 TeV based on 1.9 million positrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence. Its distinctive properties are (a) a significant excess starting from 25.2±1.8 GeV compared to the lower-energy, power-law trend, (b) a sharp dropoff above 284-64+91 GeV, (c) in the entire energy range the positron flux is well described by the sum of a term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term of positrons, which dominates at high energies, and (d) a finite energy cutoff of the source term of Es=810-180+310 GeV is established with a significance of more than 4σ. These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter annihilation or from other astrophysical sources.

AB - Precision measurements of cosmic ray positrons are presented up to 1 TeV based on 1.9 million positrons collected by the Alpha Magnetic Spectrometer on the International Space Station. The positron flux exhibits complex energy dependence. Its distinctive properties are (a) a significant excess starting from 25.2±1.8 GeV compared to the lower-energy, power-law trend, (b) a sharp dropoff above 284-64+91 GeV, (c) in the entire energy range the positron flux is well described by the sum of a term associated with the positrons produced in the collision of cosmic rays, which dominates at low energies, and a new source term of positrons, which dominates at high energies, and (d) a finite energy cutoff of the source term of Es=810-180+310 GeV is established with a significance of more than 4σ. These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter annihilation or from other astrophysical sources.

UR - http://www.scopus.com/inward/record.url?scp=85061008587&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85061008587&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.122.041102

DO - 10.1103/PhysRevLett.122.041102

M3 - Article

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 4

M1 - 041102

ER -

Aguilar M, Ali Cavasonza L, Ambrosi G, Arruda L, Attig N, Azzarello P et al. Towards Understanding the Origin of Cosmic-Ray Positrons. Physical review letters. 2019 Jan 1;122(4). 041102. https://doi.org/10.1103/PhysRevLett.122.041102