Precision measurements by the Alpha Magnetic Spectrometer (AMS) on the International Space Station of the deuteron ( ) flux are presented. The measurements are based on 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 flux exhibits nearly identical time variations with the , , and fluxes. Above 4.5 GV, the flux ratio is time independent and its rigidity dependence is well described by a single power law with . This is in contrast with the flux ratio for which we find . Above we find a nearly identical rigidity dependence of the and fluxes with a flux ratio of . 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 flux equal to of the flux and the secondary component of the flux equal to of the flux.
Aguilar, M., et al. "Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer." Physical Review Letters, vol. 132, no. 26, Jun. 2024. https://doi.org/10.1103/PhysRevLett.132.261001
Aguilar, M., Alpat, B., Ambrosi, G., Anderson, H., Arruda, L., Attig, N., Bagwell, C., Barao, F., Barbanera, M., Barrin, L., Bartoloni, A., Battiston, R., Bayyari, A., Belyaev, N., Bertucci, B., Bindi, V., Bollweg, K., Bolster, J., ... Zuccon, P. (2024). Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer. Physical Review Letters, 132(26). https://doi.org/10.1103/PhysRevLett.132.261001
Aguilar, M., Alpat, B., Ambrosi, G., et al., "Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer," Physical Review Letters 132, no. 26 (2024), https://doi.org/10.1103/PhysRevLett.132.261001
@article{osti_2473459,
author = {Aguilar, M. and Alpat, B. and Ambrosi, G. and Anderson, H. and Arruda, L. and Attig, N. and Bagwell, C. and Barao, F. and Barbanera, M. and Barrin, L. and others},
title = {Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer},
annote = { 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 × 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 , He 3 , and He 4 fluxes. Above 4.5 GV, the D / He 4 flux ratio is time independent and its rigidity dependence is well described by a single power law ∝ R Δ with Δ D / He 4 = − 0.108 ± 0.005 . This is in contrast with the He 3 / He 4 flux ratio for which we find Δ He 3 / He 4 = − 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 He 4 flux and the secondary component of the D flux equal to 58 ± 5 % of the He 3 flux. Published by the American Physical Society 2024 },
doi = {10.1103/PhysRevLett.132.261001},
url = {https://www.osti.gov/biblio/2473459},
journal = {Physical Review Letters},
issn = {ISSN PRLTAO},
number = {26},
volume = {132},
place = {United States},
publisher = {American Physical Society},
year = {2024},
month = {06}}
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