CDEX listens to the sound of cosmology from a laboratory dee

Credit: ©Science China Press
Numerous compelling evidences from astroparticle physics and cosmology indicate that the major matter component in the Universe is dark matter, accounting for about 85% with the remaining 15% is the ordinary matter. Nevertheless, people still know little about the dark matter, including its mass and other properties. Many models predict dark matter particles could couple to ordinary particle at weak interaction level, so it is possible to capture the signal of dark matter particle in the direct detection experiment. The scientific goals of the China Dark matter Experiment (CDEX) are on direct detection of light dark matter and neutrino-less double beta decay with p-type point contact germanium (PPCGe) detectors at the China Jinping Underground Laboratory (CJPL). The measurable energy spectra induced by the elastic scattering between dark matter particles and target nucleons in CDEX detector system could give us the information of dark matter mass, spin and other properties.

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