General
Yi Jia
Institute of High Energy Physics, Chinese Academy of Sciences
Email: yijia@ihep.ac.cn
Mailing Address: Main Building, Institute of High Energy Physics,
19B Yuquan Road, Shijingshan District, Beijing, China
Postal Code: 100049


Research Areas

I am working on the intersection of high-energy particle physics and astrophysics. During my time in Professor Samuel Ting’s group at the Massachusetts Institute of Technology, I participated in both detector development and physics analysis for the Alpha Magnetic Spectrometer (AMS) experiment. My work contributed to several key advances: I developed a new charge reconstruction method that improved the charge resolution of AMS by more than a factor of two, supporting the collaboration’s groundbreaking results in heavy cosmic ray nuclei (published in five Physical Review Letters). I led studies on the time evolution of cosmic rays, including crucial data analysis of protons and helium nuclei, which resulted in six AMS collaboration papers on solar physics (Physical Review Letters). I also led the analysis of the origin of lithium isotopes, which was published in Physical Review Letters and selected as an Editors’ Suggestion.

Since returning to China, I have continued my interdisciplinary research in particle and astrophysics. Currently, I work on the Jiangmen Underground Neutrino Observatory (JUNO), using neutrinos to probe supernova explosion mechanisms and search for new physics. My research focuses on precision measurements of reactor neutrino oscillations and the determination of neutrino mass ordering, the first detection of the diffuse supernova neutrino background (DSNB), and the development of a supernova early warning system. I aim to contribute to major breakthroughs in neutrino physics, supernova research, and multi-messenger astronomy.

Education

Aug. 2016 – Sep. 2018 Massachusetts Institute of Technology Ph.D.

Sep. 2012 – Jun. 2016 Xi’an Jiaotong University B.S.

Experience

May 2025 – Present Institute of High Energy Physics, Chinese Academy of Sciences, Associate Researcher

Apr. 2022 – May 2025 Massachusetts Institute of Technology, Research Scientist

Sep. 2018 – Apr. 2022 Massachusetts Institute of Technology, Postdoctoral Associate

Publications

(1) Properties of Cosmic Lithium Isotopes Measured by the Alpha Magnetic Spectrometer, Phys. Rev. Lett., 2025, 
(2) Solar Modulation of Cosmic Nuclei over a Solar Cycle: Results from the Alpha Magnetic Spectrometer, Phys. Rev. Lett., 2025, 
(3) Antiprotons and Elementary Particles over a Solar Cycle: Results from the Alpha Magnetic Spectrometer, Phys. Rev. Lett., 2025, 
(4) Properties of Cosmic Deuterons Measured by the Alpha Magnetic Spectrometer, Phys. Rev. Lett., 2024, 
(5) Temporal Structures in Positron Spectra and Charge- Sign Effects in Galactic Cosmic Rays, Phys. Rev. Lett., 2023, 
(6) Properties of Cosmic-Ray Sulfur and Determination of the Composition of Primary Cosmic-Ray Carbon, Neon, Magnesium, and Sulfur: Ten-Year Results from the Alpha Magnetic Spectrometer, Phys. Rev. Lett., 2023, 
(7) Temporal Structures in Electron Spectra and Charge Sign Effects in Galactic Cosmic Ray, Phys. Rev. Lett., 2023, 
(8) Properties of Daily Helium Fluxes, Phys. Rev. Lett., 2022, 
(9) Periodicities in the Daily Proton Fluxes from 2011 to 2019 Measured by the Alpha Magnetic Spectrometer on the International Space Station from 1 to 100 GV, Phys. Rev. Lett., 2021, 
(10) Properties of a New Group of Cosmic Nuclei: Results from the Alpha Magnetic Spectrometer on Sodium, Aluminum, and Nitrogen, Phys. Rev. Lett., 2021, 
(11) Properties of Heavy Secondary Fluorine Cosmic Rays: Results from the Alpha Magnetic Spectrometer, Phys. Rev. Lett., 2021, 
(12) The Alpha Magnetic Spectrometer (AMS) on the inter- national space station: Part II-Results from the first seven years, Physics Reports, 2021, 
(13) Properties of Iron Primary Cosmic Rays: Results from the Alpha Magnetic Spectrometer, Phys. Rev. Lett., 2021, 
(14) Properties of Neon, Magnesium, and Silicon Primary Cosmic Rays Results from the Alpha Magnetic Spectrometer, Phys. Rev. Lett., 2020, 
(15) Nuclei charge measurement by the Alpha Magnetic Spectrometer silicon tracker, Nucl. Instrum. Methods Phys. Res. A, 2020.


Conferences

(1) Unique Properties of Daily Proton Fluxes by the Alpha Magnetic Spectrometer 45th COSPAR Scientific Assembly 2024-07-14
(2) Precision Measurement of Daily Proton and Helium Fluxes by the Alpha Magnetic Spectrometer 38th International Cosmic Ray Conference (ICRC) 2023-08-02
(3) Measurements of the Cosmic Ray Nuclei with the Alpha Magnetic Spectrometer (AMS) CeNAM Frontier Conference on Nuclear Astrophysics 2023-05-25
(4) Unique Properties of Cosmic Rays: Results from the Alpha Magnetic Spectrometer 14th Conference on the Intersections of Particle and Nuclear Physics (CIPANP) 2022-09-02
(5) Precision Measurement of Daily Electron, Positron, Proton, and Helium Fluxes with the Alpha Magnetic Spectrometer Conference on TeV Particle Astrophysics (TeVPA) 2022-08-08
(6) Unique Properties of Daily Proton Fluxes up to 100 GV 45th COSPAR Scientific Assembly 2022-07-17
(7) Precision Measurement of Periodicities in the Daily Proton Fluxes with AMS 37th International Cosmic Ray Conference (ICRC) 2021-07-12
(8) Precision measurements of ³He-to-⁴He ratio and individual ³He and ⁴He fluxes in Cosmic Rays with the Alpha Magnetic Spectrometer on the International Space Station 43rd COSPAR Scientific Assembly 2021-01-28
(9) Properties of secondary cosmic-ray nuclei by AMS on International Space Station APS Division of Particles and Fields Meeting (DPF) 2019-07-29
(10) Precision measurement of the Energy Dependence of Primary and Secondary Cosmic Rays with the Alpha Magnetic Spectrometer on the International Space Station 27th International Workshop on Weak Interactions and Neutrinos (WIN) 2019-06-02
(11) Observation of New Properties of Secondary Cosmic Rays Lithium, Beryllium, and Boron by the Alpha Magnetic Spectrometer on the International Space Station 39th International Conference on High Energy Physics 2018-07-04