Towards Understanding the Origin of Cosmic-Ray Positrons

Precision measurements of cosmic ray positrons by the Alpha Magnetic Spectrometer on the International Space Station are presented up to 1 TeV based on 1.9 million positrons.The positron flux exhibits a significant excess starting from $25.2 \pm 1.8$ GeV followed by a sharp drop-off above $284^{+91}...

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Detalles Bibliográficos
Autores principales: 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, Başeğmez-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, Y, 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
Lenguaje:eng
Publicado: 2019
Materias:
Astrophysics and Astronomy
Acceso en línea:https://dx.doi.org/10.1103/PhysRevLett.122.041102
http://cds.cern.ch/record/2683834
Descripción
Sumario:Precision measurements of cosmic ray positrons by the Alpha Magnetic Spectrometer on the International Space Station are presented up to 1 TeV based on 1.9 million positrons.The positron flux exhibits a significant excess starting from $25.2 \pm 1.8$ GeV followed by a sharp drop-off above $284^{+91}_{-64}$ GeV.In the entire energy range the positron flux is well described by the sum of a diffuse termassociated with low energy secondary positrons produced in the collision of cosmic rays, and a new source term of high energy positrons with a finite energy cutoff. The finite cutoff energy of the source term, $E_s$, is established with a significance of more than $4 \sigma$, and it's value is determined to be $E_s = 810^{+310}_{-180}$ GeV.These experimental data on cosmic ray positrons show that, at high energies, they predominantly originate either from dark matter collisions or from new astrophysical sources.

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