Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

Aguilar, M.; Cavasonza, L.; Ambrosi, G.; Arruda, L.; Attig, N.; Bachlechner, A.; Barao, F.; Barrau, A.; Barrin, L.; Bartoloni, A.; 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.; Cui, Z.; Dadzie, K.; Dai, Y.; Datta, A.; Delgado, C.; Della Torre, S.; DEMİRKÖZ, MELAHAT; Derome, L.; Di Falco, S.; Di Felice, V.; Diaz, C.; Dimiccoli, F.; von Doetinchem, P.; Dong, F.; Donnini, F.; Duranti, M.; Egorov, A.; Eline, A.; Feng, J.; Fiandrini, E.; Fisher, P.; Formato, V.; Galaktionov, Y.; Gamez, C.; 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.; Hsieh, T.; Huang, H.; Huang, Z.; Incagli, M.; Jang, W.; Jia, Yi; Jinchi, H.; Kanishev, K.; Khiali, B.; Kim, G.; Kirn, Th.; Konyushikhin, M.; Kounina, O.; Kounine, A.; Koutsenko, V.; Kulemzin, A.; La Vacca, G.; Laudi, E.; Laurenti, G.; Lazzizzera, I.; Lebedev, A.; Lee, H.; Lee, S.; Li, J.; Li, Q.; Li, T.; Li, Z.; Light, C.; Lin, C.; Lippert, T.; 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.; Phan, H.; Plyaskin, V.; Poireau, V.; Poluianov, S.; Popkow, A.; Qi, X.; Qin, X.; Qu, Z.; Quadrani, L.; Rancoita, P.; Rapin, D.; Reina Conde, A.; Rosier-Lees, S.; Rozhkov, A.; Rozza, D.; Sagdeev, R.; Schael, S.; Schmidt, S.; von Dratzig, A.; Schwering, G.; Seo, E.; Shan, B.; Shi, J.; Siedenburg, T.; Solano, C.; Song, J.; Sun, Z.; Tacconi, M.; Tang, X.; Tang, Z.; Tian, J.; Ting, Samuel; Ting, S.; Tomassetti, N.; Torsti, J.; Tuysuz, C.; Urban, T.; Usoskin, I.; Vagelli, V.; Vainio, R.; Valente, E.; Valtonen, E.; Vazquez Acosta, M.; Vecchi, M.; Velasco, M.; Vialle, 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.123.181102

Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

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

PHYSICAL REVIEW LETTERS, cilt.123, sa.18, 2019 (SCI-Expanded, Scopus)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 123 Sayı: 18
Basım Tarihi: 2019
Doi Numarası: 10.1103/physrevlett.123.181102
Dergi Adı: PHYSICAL REVIEW LETTERS
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He-3 and He-4 fluxes are presented. The measurements are based on 100 million He-4 nuclei in the rigidity range from 2.1 to 21 GV and 18 million He-3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the He-3 and He-4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He-3/He-4 flux ratio is measured for the first time. Below 4 GV, the He-3/He-4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He-3/He-4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law proportional to R-Delta with Delta = 0.294 0.004. Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies.