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.

Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer / Aguilar, M.; Ali 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. 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.; Cui, Z.; Dadzie, K.; Dai, Y. M.; Datta, A.; Delgado, C.; Della Torre, S.; Demirkoz, M. B.; 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. J.; Gargiulo, C.; Gast, H.; Gebauer, I.; Gervasi, M.; Giovacchini, F.; Gomez-Coral, D. M.; Gong, J.; Goy, C.; Grabski, V.; Grandi, D.; Graziani, M.; Guo, K. H.; Haino, S.; Han, K. C.; He, Z. H.; Hsieh, T. H.; Huang, H.; Huang, Z. C.; Incagli, M.; Jang, W. Y.; Jia, Y.; Jinchi, H.; Kanishev, K.; Khiali, B.; Kim, G. N.; Kirn, T.; Konyushikhin, M.; 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.; Li, J. Q.; Li, Q.; Li, T. X.; Li, Z. H.; Light, C.; Lin, C. H.; Lippert, T.; Liu, Z.; Lu, S. Q.; Lu, Y. S.; Luebelsmeyer, K.; Luo, F.; Luo, J. Z.; Luo, X.; Lyu, S. S.; Machate, F.; Mana, C.; Marin, J.; Martin, T.; Martinez, 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.; Phan, H. D.; Plyaskin, V.; Poireau, V.; Poluianov, S.; Popkow, A.; Qi, X. M.; Qin, X.; Qu, Z. Y.; Quadrani, L.; Rancoita, P. G.; Rapin, D.; Reina Conde, A.; Rosier-Lees, S.; Rozhkov, A.; Rozza, D.; Sagdeev, R.; Schael, S.; Schmidt, S. M.; Schulz Von Dratzig, A.; Schwering, G.; Seo, E. S.; Shan, B. S.; Shi, J. Y.; Siedenburg, T.; Solano, C.; Song, J. W.; Sun, Z. T.; Tacconi, M.; Tang, X. W.; Tang, Z. C.; Tian, J.; Ting, S. C. C.; Ting, S. M.; 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. P.; 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.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 123:18(2019). [10.1103/PhysRevLett.123.181102]

Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

Rozza D.;
2019-01-01

Abstract

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.
2019
Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer / Aguilar, M.; Ali 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. 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.; Cui, Z.; Dadzie, K.; Dai, Y. M.; Datta, A.; Delgado, C.; Della Torre, S.; Demirkoz, M. B.; 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. J.; Gargiulo, C.; Gast, H.; Gebauer, I.; Gervasi, M.; Giovacchini, F.; Gomez-Coral, D. M.; Gong, J.; Goy, C.; Grabski, V.; Grandi, D.; Graziani, M.; Guo, K. H.; Haino, S.; Han, K. C.; He, Z. H.; Hsieh, T. H.; Huang, H.; Huang, Z. C.; Incagli, M.; Jang, W. Y.; Jia, Y.; Jinchi, H.; Kanishev, K.; Khiali, B.; Kim, G. N.; Kirn, T.; Konyushikhin, M.; 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.; Li, J. Q.; Li, Q.; Li, T. X.; Li, Z. H.; Light, C.; Lin, C. H.; Lippert, T.; Liu, Z.; Lu, S. Q.; Lu, Y. S.; Luebelsmeyer, K.; Luo, F.; Luo, J. Z.; Luo, X.; Lyu, S. S.; Machate, F.; Mana, C.; Marin, J.; Martin, T.; Martinez, 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.; Phan, H. D.; Plyaskin, V.; Poireau, V.; Poluianov, S.; Popkow, A.; Qi, X. M.; Qin, X.; Qu, Z. Y.; Quadrani, L.; Rancoita, P. G.; Rapin, D.; Reina Conde, A.; Rosier-Lees, S.; Rozhkov, A.; Rozza, D.; Sagdeev, R.; Schael, S.; Schmidt, S. M.; Schulz Von Dratzig, A.; Schwering, G.; Seo, E. S.; Shan, B. S.; Shi, J. Y.; Siedenburg, T.; Solano, C.; Song, J. W.; Sun, Z. T.; Tacconi, M.; Tang, X. W.; Tang, Z. C.; Tian, J.; Ting, S. C. C.; Ting, S. M.; 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. P.; 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.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 123:18(2019). [10.1103/PhysRevLett.123.181102]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/232935
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