Precision Measurements of Neon, Magnesium, and Silicon Flux in Cosmic Rays with the Alpha Magnetic Spectrometer on the International Space Station
Name
phan-hphan-phd-physics-2021-thesis.pdf
Description
Thesis PDF
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9.72 MB
Format
Adobe PDF
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f81567143c229e9a8bb41e787dea29eb
Author(s)
Phan, Huy Duc
Advisor(s)
Choutko, Vitaly
Date Issued
September 2021
Publisher
Massachusetts Institute of Technology
Abstract
Precise measurements of primary cosmic ray Neon, Magnesium and Silicon flux is important to understand the origins and propagation properties of heavy elements in the Galaxy. This thesis presents the measurements of Neon, Magnesium, and Silicon flux in the rigidity (momentum per unit charge) range from 2.15 GV to 3 TV, with 5.6 million Ne, Mg, and Si nuclei events collected during 7 years of AMS operation (2011- 2018). The three fluxes show identical rigidity dependence above 86.5 GV, deviating from a single power law and hardening at high rigidity above 200 GV. Surprisingly, the rigidity dependence of Neon, Magnesium, and Silicon flux is different from the rigidity dependence of primary nuclei Helium, Carbon and Oxygen, even though the two groups are both primaries produced at cosmic rays sources.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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