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Article
Title Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer
Author(s) AMS Collaboration  Mostra tots els 248 autors
Publication 2024
Number of pages 8
In: Phys. Rev. Lett. 132 (2024) 261001
DOI 10.1103/PhysRevLett.132.261001 (publication)
Subject category Nuclear Physics - Experiment ; Astrophysics and Astronomy
Accelerator/Facility, Experiment AMS
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, He3, and He4 fluxes. Above 4.5 GV, the D/He4 flux ratio is time independent and its rigidity dependence is well described by a single power law ∝RΔ with ΔD/He4=-0.108±0.005. This is in contrast with the He3/He4 flux ratio for which we find ΔHe3/He4=-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 He4 flux and the secondary component of the D flux equal to 58±5% of the He3 flux.
Copyright/License publication: © 2024 authors (License: CC BY 4.0)

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 Registre creat el 2024-07-05, darrera modificació el 2024-09-09


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