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.

doi:10.1103/PhysRevLett.132.261001

Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer

AMS

Collaboration

Jun 25, 2024

8 pages

Published in:

Phys.Rev.Lett. 132 (2024) 26, 261001

Published: Jun 25, 2024

DOI:

10.1103/PhysRevLett.132.261001 (publication)

Experiments:

AMS

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Abstract: (APS)

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 \times 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

,

{}^{3}{He}

, and

{}^{4}{He}

fluxes. Above 4.5 GV, the

D / {}^{4}{He}

flux ratio is time independent and its rigidity dependence is well described by a single power law

\propto R^{Δ}

with

Δ_{D / {}^{4}{He}} = - 0.108 \pm 0.005

. This is in contrast with the

{}^{3}{He} / {}^{4}{He}

flux ratio for which we find

Δ_{{}^{3}{He} / {}^{4}{He}} = - 0.289 \pm 0.003

. Above

\sim 13 GV

we find a nearly identical rigidity dependence of the

D

and

p

fluxes with a

D / p

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

D

flux equal to

9.4 \pm 0.5 %

of the

{}^{4}{He}

flux and the secondary component of the

D

flux equal to

58 \pm 5 %

of the

{}^{3}{He}

flux.

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