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Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer

Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of the deuteron (๐ท) flux are presented. The measurements are based on $21ร—10^6$ ๐ท 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 ๐ท flux exhibits nearly identical time variations with the ๐‘, $^{3}\textrm{He}$, and $^{4}\textrm{He}$ fluxes. Above 4.5 GV, the $D/^{4}\textrm{He}$ flux ratio is time independent and its rigidity dependence is well described by a single power law $\propto R ^{\Delta}$ with $\Delta _{D/^{4}\textrm{He}} = โˆ’0.108 \pm 0.005$. This is in contrast with the $^3\textrm{He}/^4\textrm{He}$ flux ratio for which we find $\Delta _{^{3}\textrm{He}/^{4}\textrm{He}}=โˆ’0.289 \pm 0.003$. Above โˆผ13โ€‰โ€‰GV we find a nearly identical rigidity dependence of the ๐ท and ๐‘ fluxes with a ๐ท/๐‘ flux ratio of $0.027 \pm 0.001$. 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 ๐ท flux equal to $9.4 \pm 0.5\%$ of the $^{4}\textrm{He}$ flux and the secondary component of the ๐ท flux equal to $58 \pm 5\%$ of the $^{3}\textrm{He}$ flux.

Phys. Rev. Lett. 132, 261001
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AMS-02 Publications

Total citations to-date: 7, 432
Published on Editors' Suggestion Featured in Physics
Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer
Phys. Rev. Lett. 132, 261001 (2024), Citations: 1, View supplemental material and data
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Temporal Structures in Positron Spectra and Charge-Sign Effects in Galactic Cosmic Rays
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Properties of Cosmic-Ray Sulfur and Determination of the Composition of Primary Cosmic-Ray Carbon, Neon, Magnesium, and Sulfur: Ten-Year Results from the Alpha Magnetic Spectrometer
Phys. Rev. Lett. 130, 211002 (2023), Citations: 12, View supplemental material and data
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Temporal Structures in Electron Spectra and Charge Sign Effects in Galactic Cosmic Rays
Phys. Rev. Lett. 130, 161001 (2023), Citations: 11, View supplemental material and data
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Properties of Daily Helium Fluxes
Phys. Rev. Lett. 128, 231102 (2022), Citations: 22, View supplemental material and data
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Periodicities in the Daily Proton Fluxes from 2011 to 2019 Measured by the Alpha Magnetic Spectrometer on the International Space Station from 1 to 100 GV
Phys. Rev. Lett. 127, 271102 (2021), Citations: 40, View supplemental material and data
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Properties of a New Group of Cosmic Nuclei: Results from the Alpha Magnetic Spectrometer on Sodium, Aluminum, and Nitrogen
Phys. Rev. Lett. 127, 021101 (2021), Citations: 28, View supplemental material and data
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Properties of Heavy Secondary Fluorine Cosmic Rays: Results from the Alpha Magnetic Spectrometer
Phys. Rev. Lett. 126, 081102 (2021), Citations: 41, View supplemental material and data
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The Alpha Magnetic Spectrometer (AMS) on the International Space Station: Part II - Results from the First Seven Years
Phys. Rep. 894, 1 (2021), Citations: 280, View supplemental material and data
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Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer
Phys. Rev. Lett. 126, 041104 (2021), Citations: 86, View supplemental material and data
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Properties of Neon, Magnesium, and Silicon Primary Cosmic Rays Results from the Alpha Magnetic Spectrometer
Phys. Rev. Lett. 124, 211102 (2020), Citations: 97, View supplemental material and data
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Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer
Phys. Rev. Lett. 123, 181102 (2019), Citations: 59, View supplemental material and data
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Towards Understanding the Origin of Cosmic-Ray Electrons
Phys. Rev. Lett. 122, 101101 (2019), Citations: 168, View supplemental material and data
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Towards Understanding the Origin of Cosmic-Ray Positrons
Phys. Rev. Lett. 122, 041102 (2019), Citations: 286, View supplemental material and data
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Precision Measurement of Cosmic-Ray Nitrogen and its Primary and Secondary Components with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 121, 051103 (2018), Citations: 91, View supplemental material and data
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Observation of Complex Time Structures in the Cosmic-Ray Electron and Positron Fluxes with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 121, 051102 (2018), Citations: 88, View supplemental material and data
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Observation of Fine Time Structures in the Cosmic Proton and Helium Fluxes with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 121, 051101 (2018), Citations: 111, View supplemental material and data
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Observation of New Properties of Secondary Cosmic Rays Lithium, Beryllium, and Boron by the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 120, 021101 (2018), Citations: 270, View supplemental material and data
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Observation of the Identical Rigidity Dependence of He, C, and O Cosmic Rays at High Rigidities by the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 119, 251101 (2017), Citations: 285, View supplemental material and data
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Precision Measurement of the Boron to Carbon Flux Ratio in Cosmic Rays from 1.9 GV to 2.6 TV with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 117, 231102 (2016), Citations: 371, View supplemental material and data
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Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 117, 091103 (2016), Citations: 556, View supplemental material and data
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Precision Measurement of the Helium Flux in Primary Cosmic Rays of Rigidities 1.9 GV to 3 TV with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 115, 211101 (2015), Citations: 527, View supplemental material and data
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Precision Measurement of the Proton Flux in Primary Cosmic Rays from Rigidity 1 GV to 1.8 TV with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 114, 171103 (2015), Citations: 965, View supplemental material and data
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Precision Measurement of the (${\rm e}^+$ + ${\rm e}^โˆ’$) Flux in Primary Cosmic Rays from 0.5 GeV to 1 TeV with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 113, 221102 (2014), Citations: 375, View supplemental material and data
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Electron and Positron Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 113, 121102 (2014), Citations: 624, View supplemental material and data
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High Statistics Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5 โ€“ 500 GeV with the Alpha Magnetic Spectrometer on the International Space Station
Phys. Rev. Lett. 113, 121101 (2014), Citations: 682, View supplemental material and data
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First Result from the Alpha Magnetic Spectrometer on the International Space Station: Precision Measurement of the Positron Fraction in Primary Cosmic Rays of 0.5โ€“350 GeV
Phys. Rev. Lett. 110, 141102 (2013), Citations: 1,354, View supplemental material and data

* Citation information from High-Energy Physics Literature Database.