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 21×106 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, 3He, and 4He fluxes. Above 4.5 GV, the 𝐷/4He flux ratio is time independent and its rigidity dependence is well described by a single power law ∝𝑅Δ with Δ𝐷/4He=−0.108±0.005. This is in contrast with the 3He/4He flux ratio for which we find Δ3He/4He=−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 4He flux and the secondary component of the 𝐷 flux equal to 58±5% of the 3He flux.

Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer / Aguilar, M., Alpat, B., Ambrosi, G., Anderson, H., Arruda, L., Attig, N., Bagwell, C., Barao, F., Barbanera, M., Barrin, L., Bartoloni, A., Battiston, R., Bayyari, A., Belyaev, N., Bertucci, B., Bindi, V., Bollweg, K., Bolster, J., Borchiellini, M., Borgia, B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 132:26(2024), p. 261001. [10.1103/physrevlett.132.261001]

Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer

Battiston, R.;Burger, J.;Dass, A.;Dimiccoli, F.;Lazzizzera, I.;Nicolaidis, R.;Nozzoli, F.;Rossi, F.;Zuccon, P.;
2024-01-01

Abstract

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 21×106 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, 3He, and 4He fluxes. Above 4.5 GV, the 𝐷/4He flux ratio is time independent and its rigidity dependence is well described by a single power law ∝𝑅Δ with Δ𝐷/4He=−0.108±0.005. This is in contrast with the 3He/4He flux ratio for which we find Δ3He/4He=−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 4He flux and the secondary component of the 𝐷 flux equal to 58±5% of the 3He flux.
2024
26
Aguilar, M.; Alpat, B.; Ambrosi, G.; Anderson, H.; Arruda, L.; Attig, N.; Bagwell, C.; Barao, F.; Barbanera, M.; Barrin, L.; Bartoloni, A.; Battiston,...espandi
Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer / Aguilar, M., Alpat, B., Ambrosi, G., Anderson, H., Arruda, L., Attig, N., Bagwell, C., Barao, F., Barbanera, M., Barrin, L., Bartoloni, A., Battiston, R., Bayyari, A., Belyaev, N., Bertucci, B., Bindi, V., Bollweg, K., Bolster, J., Borchiellini, M., Borgia, B., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 132:26(2024), p. 261001. [10.1103/physrevlett.132.261001]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/419651
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