Properties of a New Group of Cosmic Nuclei: Results from the Alpha Magnetic Spectrometer on Sodium, Aluminum, and Nitrogen

Alpha Magnetic Spectrometer - AMS; L. Ali Cavasonza; B. Alpat; G. Ambrosi; L. Arruda; Manuela Vecchi

doi:10.1103/PhysRevLett.127.021101

Properties of a New Group of Cosmic Nuclei: Results from the Alpha Magnetic Spectrometer on Sodium, Aluminum, and Nitrogen

Alpha Magnetic Spectrometer - AMS, L. Ali Cavasonza, B. Alpat, G. Ambrosi, L. Arruda, Manuela Vecchi

Astronomy

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Abstract

We report the properties of sodium (Na) and aluminum (Al) cosmic rays in the rigidity range 2.15 GV to 3.0 TV based on 0.46 million sodium and 0.51 million aluminum nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. We found that Na and Al, together with nitrogen (N), belong to a distinct cosmic ray group. In this group, we observe that, similar to the N flux, both the Na flux and Al flux are well described by the sums of a primary cosmic ray component (proportional to the silicon flux) and a secondary cosmic ray component (proportional to the fluorine flux). The fraction of the primary component increases with rigidity for the N, Na, and Al fluxes and becomes dominant at the highest rigidities. The Na /Si and Al /Si abundance ratios at the source, 0.036 ±0.003 for Na /Si and 0.103 ±0.004 for Al /Si , are determined independent of cosmic ray propagation.

Original language	English
Article number	021101
Number of pages	9
Journal	Physical Review Letters
Volume	127
DOIs	https://doi.org/10.1103/PhysRevLett.127.021101
Publication status	Published - 1-Jul-2021

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Properties of a New Group of Cosmic Nuclei: Results from the Alpha Magnetic SpectrometerFinal publisher's version, 977 KBLicence: CC BY

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@article{91e3021e235b4d84948beb30857ff498,

title = "Properties of a New Group of Cosmic Nuclei: Results from the Alpha Magnetic Spectrometer on Sodium, Aluminum, and Nitrogen",

abstract = "We report the properties of sodium (Na) and aluminum (Al) cosmic rays in the rigidity range 2.15 GV to 3.0 TV based on 0.46 million sodium and 0.51 million aluminum nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. We found that Na and Al, together with nitrogen (N), belong to a distinct cosmic ray group. In this group, we observe that, similar to the N flux, both the Na flux and Al flux are well described by the sums of a primary cosmic ray component (proportional to the silicon flux) and a secondary cosmic ray component (proportional to the fluorine flux). The fraction of the primary component increases with rigidity for the N, Na, and Al fluxes and becomes dominant at the highest rigidities. The Na /Si and Al /Si abundance ratios at the source, 0.036 ±0.003 for Na /Si and 0.103 ±0.004 for Al /Si , are determined independent of cosmic ray propagation.",

author = "{Alpha Magnetic Spectrometer - AMS} and M. Aguilar and Cavasonza, {L. Ali} and B. Alpat and G. Ambrosi and L. Arruda and Manuela Vecchi and L. Wang",

year = "2021",

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day = "1",

doi = "10.1103/PhysRevLett.127.021101",

language = "English",

volume = "127",

journal = "Physical Review Letters",

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T1 - Properties of a New Group of Cosmic Nuclei: Results from the Alpha Magnetic Spectrometer on Sodium, Aluminum, and Nitrogen

AU - Alpha Magnetic Spectrometer - AMS

AU - Aguilar, M.

AU - Cavasonza, L. Ali

AU - Alpat, B.

AU - Ambrosi, G.

AU - Arruda, L.

AU - Vecchi, Manuela

AU - Wang, L.

PY - 2021/7/1

Y1 - 2021/7/1

N2 - We report the properties of sodium (Na) and aluminum (Al) cosmic rays in the rigidity range 2.15 GV to 3.0 TV based on 0.46 million sodium and 0.51 million aluminum nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. We found that Na and Al, together with nitrogen (N), belong to a distinct cosmic ray group. In this group, we observe that, similar to the N flux, both the Na flux and Al flux are well described by the sums of a primary cosmic ray component (proportional to the silicon flux) and a secondary cosmic ray component (proportional to the fluorine flux). The fraction of the primary component increases with rigidity for the N, Na, and Al fluxes and becomes dominant at the highest rigidities. The Na /Si and Al /Si abundance ratios at the source, 0.036 ±0.003 for Na /Si and 0.103 ±0.004 for Al /Si , are determined independent of cosmic ray propagation.

AB - We report the properties of sodium (Na) and aluminum (Al) cosmic rays in the rigidity range 2.15 GV to 3.0 TV based on 0.46 million sodium and 0.51 million aluminum nuclei collected by the Alpha Magnetic Spectrometer experiment on the International Space Station. We found that Na and Al, together with nitrogen (N), belong to a distinct cosmic ray group. In this group, we observe that, similar to the N flux, both the Na flux and Al flux are well described by the sums of a primary cosmic ray component (proportional to the silicon flux) and a secondary cosmic ray component (proportional to the fluorine flux). The fraction of the primary component increases with rigidity for the N, Na, and Al fluxes and becomes dominant at the highest rigidities. The Na /Si and Al /Si abundance ratios at the source, 0.036 ±0.003 for Na /Si and 0.103 ±0.004 for Al /Si , are determined independent of cosmic ray propagation.

U2 - 10.1103/PhysRevLett.127.021101

DO - 10.1103/PhysRevLett.127.021101

M3 - Article

SN - 0031-9007

VL - 127

JO - Physical Review Letters

JF - Physical Review Letters

M1 - 021101

ER -

Properties of a New Group of Cosmic Nuclei: Results from the Alpha Magnetic Spectrometer on Sodium, Aluminum, and Nitrogen

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