Speaker
Prof.
Hao Ma
(Tsinghua University)
Description
The China Dark Matter Experiment (CDEX), located at the China Jinping Underground Laboratory (CJPL) whose overburden is about 2400m rock, aims at direct searches of light Weakly Interacting Massive Particles (WIMPs). A single-element 994-gram p-type point contact (PPC) germanium detector (CDEX1B) runs inside a solid passive shielding system. To achieve lower background, a prototype 10kg PPC germanium detector array (CDEX10), consisting of three detector strings with three germanium crystals each, is directly immersed in the liquid nitrogen. With the energy threshold of 160eV, the limits on WIMP-nucleus scattering are set by energy spectra and annual modulation analysis, respectively. Incorporating Migdal effect and bremsstrahlung emissions, the data are re-analyzed to search sub-GeV WIMPs. In addition, other DM candidates, i.e. dark photon and axion, are constrained. Finally, the future plan of CDEX experiment in CJPL-II is introduced.
Primary author
Prof.
Hao Ma
(Tsinghua University)
Co-authors
Dr
Litao Yang
(Tsinghua University)
Prof.
Qian Yue
(Tsinghua University)
Prof.
Tao Xue
(Tsinghua University)
Dr
Ze She
(Tsinghua University)
Prof.
Zhi Zeng
(Tsinghua University)
