Towards Understanding the Origin of Cosmic-Ray Positrons

Aguilar, M.; Cavasonza, L.; Ambrosi, G.; Arruda, L.; Attig, N.; Azzarello, P.; Bachlechner, A.; Barao, F.; Barrau, A.; Barrin, L.; Bartoloni, A.; Basara, L.; Basegmez-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.; Bourquin, M.; Bueno, E.; Burger, J.; Burger, W.; Cai, X.; Capell, M.; Caroff, S.; Casaus, J.; Castellini, G.; Cervelli, F.; Chang, Y.; Chen, G.; Chen, H.; Chen, Y.; Cheng, L.; Chou, H.; Choutko, V.; Chung, C.; Clark, C.; Coignet, G.; Consolandi, C.; Contin, A.; Corti, C.; Crispoltoni, M.; Cui, Z.; Dadzie, K.; Dai, Y.; Datta, A.; Delgado, C.; Della Torre, S.; DEMİRKÖZ, MELAHAT; Derome, L.; Di Falco, S.; Dimiccoli, F.; Diaz, 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.; Garcia-Lopez, R.; Gargiulo, C.; Gast, H.; Gebauer, I.; Gervasi, M.; Giovacchini, F.; Gomez-Coral, D.; Gong, J.; Goy, C.; Grabski, V.; Grandi, D.; Graziani, M.; Guo, K.; Haino, S.; Han, K.; He, Z.; Heil, M.; Hsieh, T.; Huang, H.; Huang, Z.; 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.; Lee, S.; Leluc, C.; Li, J.; Li, Q.; Li, T.; Li, Z.; Light, C.; Lin, C.; Lippert, T.; Liu, F.; Liu, Hu; Liu, Z.; Lu, S.; Lu, Y.; Luebelsmeyer, K.; Luo, F.; Luo, J.; Luo, Xi; Lyu, S.; Machate, F.; Mana, C.; Marin, J.; Martin, T.; Martinez, G.; Masi, N.; Maurin, D.; Menchaca-Rocha, A.; Meng, Q.; Mo, D.; Molero, M.; Mott, P.; Mussolin, L.; Nelson, T.; Ni, J.; Nikonov, N.; Nozzoli, F.; Oliva, A.; Orcinha, M.; Palermo, M.; Palmonari, F.; Paniccia, M.; Pashnin, A.; Pauluzzi, M.; Pensotti, S.; Perrina, C.; Phan, H.; Picot-Clemente, N.; Plyaskin, V.; Pohl, M.; Poireau, V.; Popkow, A.; Quadrani, L.; Qi, X.; Qin, X.; Qu, Z.; Rancoita, P.; Rapin, D.; Reina Conde, A.; Rosier-Lees, S.; Rozhkov, A.; Rozza, D.; Sagdeev, R.; Solano, C.; Schael, S.; Schmidt, S.; von Dratzig, A.; Schwering, G.; Seo, E.; Shan, B.; Shi, J.; Siedenburg, T.; Song, J.; Sun, Z.; Tacconi, M.; Tang, X.; Tang, Z.; Tian, J.; Ting, Samuel; Ting, S.; Tomassetti, N.; Torsti, J.; Urban, T.; Vagelli, V.; Valente, E.; Valtonen, E.; Vazquez Acosta, M.; Vecchi, M.; Velasco, M.; Vialle, J.; Vizan, J.; Wang, L.; Wang, N.; Wang, Q.; Wang, X.; Wang, X.; Wang, Z.; Wei, J.; Weng, Z.; Wu, H.; Xiong, R.; Xu, W.; Yan, Q.; Yang, Y.; Yi, H.; Yu, Y.; Yu, Z.; Zannoni, M.; Zeissler, S.; Zhang, C.; Zhang, F.; Zhang, J.; Zhang, Z.; Zhao, F.; Zheng, Z.; Zhuang, H.; Zhukov, V.; Zichichi, A.; Zimmermann, N.; Zuccon, P.

doi:10.1103/physrevlett.122.041102

Towards Understanding the Origin of Cosmic-Ray Positrons

Atıf İçin Kopyala

Aguilar M., Cavasonza L. A., Ambrosi G., Arruda L., Attig N., Azzarello P., ...Daha Fazla

PHYSICAL REVIEW LETTERS, cilt.122, sa.4, 2019 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 122 Sayı: 4
Basım Tarihi: 2019
Doi Numarası: 10.1103/physrevlett.122.041102
Dergi Adı: PHYSICAL REVIEW LETTERS
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

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 E-s = 810(-180)(+310) GeV is established with a significance of more than 4 sigma. 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.