Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

Alpha Magnetic Spectrometer - AMS; Suzan  Basegmez du Pree; E. F. Bueno; M. Vecchi

doi:10.1103/PhysRevLett.123.181102

Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

Alpha Magnetic Spectrometer - AMS
, Suzan Basegmez du Pree
, E. F. Bueno
, M. Vecchi

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He 3 and He 4 fluxes are presented. The measurements are based on 100 million He 4 nuclei in the rigidity range from 2.1 to 21 GV and 18 million He 3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the He 3 and He 4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He 3 /He 4 flux ratio is measured for the first time. Below 4 GV, the He 3 /He 4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He 3 /He 4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law ∝RΔ with Δ =-0.294 ±0.004 . Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies.

Original language	English
Article number	181102
Number of pages	8
Journal	Physical Review Letters
Volume	123
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevLett.123.181102
Publication status	Published - 1-Nov-2019

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@article{67a1517de5dc4c94817148944fd0549a,

title = "Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer",

abstract = "Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He 3 and He 4 fluxes are presented. The measurements are based on 100 million He 4 nuclei in the rigidity range from 2.1 to 21 GV and 18 million He 3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the He 3 and He 4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He 3 /He 4 flux ratio is measured for the first time. Below 4 GV, the He 3 /He 4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He 3 /He 4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law ∝RΔ with Δ =-0.294 ±0.004 . Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies.",

author = "\{Alpha Magnetic Spectrometer - AMS\} and M. Aguilar and \{Ali Cavasonza\}, L. and G. Ambrosi and L. Arruda and \{Basegmez du Pree\}, Suzan and Bueno, \{E. F.\} and J. Burger and Li, \{T. X.\} and Li, \{Z. H.\} and Lin, \{C. H.\} and Z. Liu and F. Luo and Q. Meng and X. Qin and Schmidt, \{S. M.\} and Song, \{J. W.\} and Sun, \{Z. T.\} and Tang, \{X. W.\} and Tang, \{Z. C.\} and M. Vecchi and Wang, \{L. Q.\} and Wang, \{N. H.\} and Wang, \{Q. L.\} and Wang, \{X. Q.\} and Wang, \{X. Q.\} and Wang, \{Z. X.\} and J. Wei and H. Wu and W. Xu and Y. Yang and Yu, \{Y. J.\} and Yu, \{Z. Q.\} and C. Zhang and F. Zhang and Zhang, \{J. H.\} and Z. Zhang and F. Zhao and Zheng, \{Z. M.\}",

year = "2019",

month = nov,

day = "1",

doi = "10.1103/PhysRevLett.123.181102",

language = "English",

volume = "123",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "AMER PHYSICAL SOC",

number = "18",

}

TY - JOUR

T1 - Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

AU - Alpha Magnetic Spectrometer - AMS

AU - Aguilar, M.

AU - Ali Cavasonza, L.

AU - Ambrosi, G.

AU - Arruda, L.

AU - Basegmez du Pree, Suzan

AU - Bueno, E. F.

AU - Burger, J.

AU - Li, T. X.

AU - Li, Z. H.

AU - Lin, C. H.

AU - Liu, Z.

AU - Luo, F.

AU - Meng, Q.

AU - Qin, X.

AU - Schmidt, S. M.

AU - Song, J. W.

AU - Sun, Z. T.

AU - Tang, X. W.

AU - Tang, Z. C.

AU - Vecchi, M.

AU - Wang, L. Q.

AU - Wang, N. H.

AU - Wang, Q. L.

AU - Wang, X. Q.

AU - Wang, Z. X.

AU - Wei, J.

AU - Wu, H.

AU - Xu, W.

AU - Yang, Y.

AU - Yu, Y. J.

AU - Yu, Z. Q.

AU - Zhang, C.

AU - Zhang, F.

AU - Zhang, J. H.

AU - Zhang, Z.

AU - Zhao, F.

AU - Zheng, Z. M.

PY - 2019/11/1

Y1 - 2019/11/1

N2 - Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He 3 and He 4 fluxes are presented. The measurements are based on 100 million He 4 nuclei in the rigidity range from 2.1 to 21 GV and 18 million He 3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the He 3 and He 4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He 3 /He 4 flux ratio is measured for the first time. Below 4 GV, the He 3 /He 4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He 3 /He 4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law ∝RΔ with Δ =-0.294 ±0.004 . Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies.

AB - Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of He 3 and He 4 fluxes are presented. The measurements are based on 100 million He 4 nuclei in the rigidity range from 2.1 to 21 GV and 18 million He 3 from 1.9 to 15 GV collected from May 2011 to November 2017. We observed that the He 3 and He 4 fluxes exhibit nearly identical variations with time. The relative magnitude of the variations decreases with increasing rigidity. The rigidity dependence of the He 3 /He 4 flux ratio is measured for the first time. Below 4 GV, the He 3 /He 4 flux ratio was found to have a significant long-term time dependence. Above 4 GV, the He 3 /He 4 flux ratio was found to be time independent, and its rigidity dependence is well described by a single power law ∝RΔ with Δ =-0.294 ±0.004 . Unexpectedly, this value is in agreement with the B/O and B/C spectral indices at high energies.

U2 - 10.1103/PhysRevLett.123.181102

DO - 10.1103/PhysRevLett.123.181102

M3 - Article

SN - 0031-9007

VL - 123

JO - Physical Review Letters

JF - Physical Review Letters

IS - 18

M1 - 181102

ER -

Properties of Cosmic Helium Isotopes Measured by the Alpha Magnetic Spectrometer

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