Why in News?
DAMPE, China's Dark Matter Particle Explorer nicknamed "Wukong" (the Monkey King) made headlines in late April 2026 with new cosmic ray findings published in Nature. The satellite observed a charge-dependent limit in cosmic ray acceleration, evidencing a nearby "super particle accelerator" within 1,000 light-years of Earth.
Technical & Mission Profile
- Origin: China's first astronomical satellite, launched by the Chinese Academy of Sciences (CAS).
- Launch Date: December 17, 2015, from the Jiuquan Satellite Launch Center.
- Orbit: Sun-synchronous polar orbit at an altitude of approximately 500 km.
- Primary Objective: To identify "smoking gun" signatures of dark matter annihilation or decay by observing high-energy electrons and photons.
- International Collaboration: While led by China, it includes significant contributions from Italy (INFN) and Switzerland (University of Geneva).
Scientific Instruments
The satellite carries four high-precision detectors:
- BGO Calorimeter: Measures the energy of cosmic rays with excellent resolution.
- Silicon-Tungsten Tracker (STK): Reconstructs the paths and directions of incoming particles.
- Plastic Scintillator Detector: Measures the electric charge of high-energy particles.
- Neutron Detector: Helps distinguish between different types of high-energy signals.
Key Discoveries to Date
- Proton & Helium Flux: Recorded the most precise measurements of proton and helium spectra at tera-electronvolt (TeV) levels.
- Gamma-Ray Excess: Confirmed an excess of gamma rays from the Galactic center, consistent with previous observations by NASA's Fermi-LAT.
- Boron-to-Carbon Ratio: Obtained high-precision spectra of secondary particles, helping refine models of how cosmic rays travel through the interstellar medium.
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