Speaker
Description
The PandaX-4T experiment is a dual-phase liquid xenon time projection chamber operated at the China Jinping Underground Laboratory (CJPL), shielded by approximately 2400 m of rock overburden. The detector contains 4 tonnes of liquid xenon, with a 3.7-tonne fiducial mass optimized for ultra-low background rare-event searches.
Using commissioning and early science data, PandaX-4T has set leading limits on spin-independent WIMP–nucleon elastic scattering, reaching cross-section sensitivities near 10^{-47} cm^2 for WIMP masses around tens of GeV/c^2. The analysis is based on a profile likelihood approach with data-driven background modeling, including intrinsic radioactivity and neutron-induced backgrounds.
In addition, PandaX-4T has reported an indication of solar ^8\mathrm{B} neutrinos via coherent elastic neutrino–nucleus scattering (CEνNS) with a few-sigma significance. This result validates detector response in the sub-keV to few-keV region and marks an important step toward precision neutrino measurements and exploration of the neutrino fog. Parallel studies include rare xenon processes such as double-beta decay.
| Main Contribution topic | Direct detection |
|---|---|
| Secondary contribution topic | Astrophysical observations |