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Abstract：
The China Dark Matter Experiment (CDEX), located at the China Jinping Underground Laboratory (CJPL) with an overburden of about 2400 m rock, aims at direct detection of low mass dark matter particles and search for Ge-76 double β decay process. The first generation of the CDEX, using two single-element 994-gram p-type point contact (PPC) germanium detectors (CDEX1), 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 and shielded with copper and polythene. Results of WIMP-nucleus scattering by energy spectral and annual modulation analysis are present with the energy threshold of 160eV, respectively. A lower reach to sub-GeV energy region is also achieved by considering Migdal effect. In addition, other DM candidates, i.e. dark photon and axion, are constrained. Finally, the prospects of CDEX experiment for dark matter and Ge-76 double β decay in the new CJPL-II laboratory are shown.
Biography:
Professor Hao Ma obtained PhD from the Department of Engineering Physics of Tsinghua University in 2009. After that, he worked as a postdoctoral fellow in CJPL and joined Tsinghua University as a faculty in 2011. His research mainly focuses on searching for the existence of particle dark matter and developing a better understanding of the properties of neutrinos, i.e. rare-event physics, both of which imply new physics beyond the Standard Model of particle physics. He is now the deputy spokesperson of the CDEX experiment and the deputy director of the science department of CJPL.
Host: Prof. Ke Han
Alternative online link: https://meeting.tencent.com/dm/UOb83RR5agm9 (id: 966826888 passcode: 123456）