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  • Properties of Cosmic Deuter...
    Aguilar, M.; Ambrosi, G.; Attig, N.; Barrin, L.; Battiston, R.; Bayyari, A.; Bindi, V.; Bollweg, K.; Bolster, J.; Burger, J.; Cai, X. D.; Capell, M.; Casaus, J.; Cervelli, F.; Chang, Y. H.; Chouridou, S.; Choutko, V.; Consolandi, C.; Corti, C.; D’Angelo, F.; Dass, A.; Demirköz, M. B.; Derome, L.; Di Felice, V.; Dimiccoli, F.; Dong, F.; Donnini, F.; Egorov, A.; Faldi, F.; Fehr, D.; Gámez, C.; Gast, H.; Grandi, D.; Haino, S.; Han, K. C.; Hashmani, R. K.; He, Z. H.; Hsieh, T. H.; Hu, J. Y.; Ionica, M.; Incagli, M.; Kounina, O.; Kounine, A.; Kuhlman, A.; Laurenti, G.; Lee, H. T.; Lee, S. C.; Li, H. L.; Li, M.; Li, Q.; Li, S.; Li, S. L.; Lin, C. H.; Lippert, T.; Liu, J. H.; Masi, N.; Medvedeva, T.; Menchaca-Rocha, A.; Mott, P.; Mussolin, L.; Nicolaidis, R.; Nozzoli, F.; Ocampo-Peleteiro, J.; Orcinha, M.; Paniccia, M.; Pashnin, A.; Plyaskin, V.; Pridöhl, D.; Quadrani, L.; Rancoita, P. G.; Rapin, D.; Conde, A. Reina; Rodríguez-García, I.; Rozhkov, A.; Schultz von Dratzig, A.; Schwering, G.; Shan, B. S.; Siedenburg, T.; Song, X. J.; Strigari, L.; Sun, Q.; Sun, Z. T.; Tang, Z. C.; Usoskin, I.; Vagelli, V.; Vainio, R.; Vecchi, M.; Velasco, M.; Wang, L.; Wang, N. H.; Weng, Z. L.; Xiong, X. Z.; Yi, H.; You, Y. H.; Zhang, F. Z.; Zhang, J.; Zhang, Z.; Zheng, C.; Zhukov, V.; Zichichi, A.

    Physical review letters, 6/2024, Volume: 132, Issue: 26
    Journal Article

    Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of the deuteron ( D ) flux are presented. The measurements are based on 21 × 10 6 D nuclei in the rigidity range from 1.9 to 21 GV collected from May 2011 to April 2021. We observe that over the entire rigidity range the D flux exhibits nearly identical time variations with the p , He 3 , and He 4 fluxes. Above 4.5 GV, the D / He 4 flux ratio is time independent and its rigidity dependence is well described by a single power law ∝ R Δ with Δ D / He 4 = − 0.108 ± 0.005 . This is in contrast with the He 3 / He 4 flux ratio for which we find Δ He 3 / He 4 = − 0.289 ± 0.003 . Above ∼ 13 GV we find a nearly identical rigidity dependence of the D and p fluxes with a D / p flux ratio of 0.027 ± 0.001 . These unexpected observations indicate that cosmic deuterons have a sizable primarylike component. With a method independent of cosmic ray propagation, we obtain the primary component of the D flux equal to 9.4 ± 0.5 % of the He 4 flux and the secondary component of the D flux equal to 58 ± 5 % of the He 3 flux. Published by the American Physical Society 2024