A5103810505- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- High-Energy Particle Collisions Research
- Air Quality and Health Impacts
- Radiation Therapy and Dosimetry
- Urban Transport and Accessibility
- Biofield Effects and Biophysics
- Relativity and Gravitational Theory
- CCD and CMOS Imaging Sensors
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Neutrino Physics Research
- Environmental Justice and Health Disparities
- Earthquake Detection and Analysis
- Galaxies: Formation, Evolution, Phenomena
- Photocathodes and Microchannel Plates
State Key Joint Laboratory of Environment Simulation and Pollution Control
2025
Tsinghua University
2014-2025
Nuctech (China)
2013-2014
We report results on the searches of weakly interacting massive particles (WIMPs) with sub-GeV masses (m_{χ}) via WIMP-nucleus spin-independent scattering Migdal effect incorporated. Analysis time-integrated (TI) and annual modulation (AM) effects CDEX-1B data are performed, 737.1 kg day exposure 160 eVee threshold for TI analysis, 1107.5 250 AM analysis. The sensitive windows in m_{χ} expanded by an order magnitude to lower DM New limits σ_{χN}^{SI} at 90% confidence level derived as...
We report the first results of a light weakly interacting massive particles (WIMPs) search from CDEX-10 experiment with 10 kg germanium detector array immersed in liquid nitrogen at China Jinping Underground Laboratory physics data size 102.8 day. At an analysis threshold 160 eVee, improved limits 8×10^{-42} and 3×10^{-36} cm^{2} 90% confidence level on spin-independent spin-dependent WIMP-nucleon cross sections, respectively, WIMP mass (m_{χ}) 5 GeV/c^{2} are achieved. The lower reach m_{χ}...
We report results of a search for light Dark Matter WIMPs with CDEX-1 experiment at the China Jinping Underground Laboratory, based on 53.9 kg-days data from p-type point-contact germanium detector enclosed by NaI(Tl) crystal scintillator as anti-Compton detector. The event rate and spectrum above analysis threshold 475 eVee are consistent understood background model. Part allowed regions WIMP-nucleus coherent elastic scattering WIMP mass 6-20 GeV probed excluded. Independent interaction...
The China Dark Matter Experiment Collaboration reports the first experimental limit on weakly interacting massive particles (WIMPs) dark matter from 14.6 kg-days of data taken with a 994 g p-type point-contact germanium detector at Jinping underground laboratory where rock overburden is more than 2400 m. energy threshold achieved was 400 eVee. According to kg-day live data, we placed...
Dark matter direct detection experiments mostly operate at deep underground laboratories. It is necessary to consider shielding effect of the Earth, especially for dark particles interacting with a large cross section. We analyzed and simulated Earth China Jinping Underground Laboratory (CJPL) simulation package, CJPL Shielding Simulation code (CJPL_ESS), which applicable other locations. The further constraints on $\ensuremath{\chi}\text{\ensuremath{-}}\mathrm{N}$ section exclusion regions...
Recently a dark matter–electron (DM–electron) paradigm has drawn much attention. Models beyond the standard halo model describing DM accelerated by high energy celestial bodies are under intense examination as well. In this Letter, velocity components analysis (VCA) method dedicated to swift of DM–electron interactions via semiconductor detectors is proposed and first HPGe detector-based realized. Utilizing method, germanium based constraint on sub-GeV solar reflected interaction presented...
Abstract CDEX-50 is a next-generation project of the China Dark Matter Experiment (CDEX) that aims to search for dark matter using 50-kg germanium detector array. This paper comprises thorough summary experiment, including an investigation potential background sources and development model. Based on baseline model, projected sensitivity weakly interacting massive particle (WIMP) also presented. The expected level within energy region interest, set 2–2.5 keVee, ∼0.01 counts keVee -1 kg day ....
The relationship between the socioeconomic status (SES) and PM2.5 exposure is rather inconclusive. We employed taxi-based measurements with 30 m resolution to characterize local source contribution (PM2.5 adjusted concentration) discerned for 2019 winter 2020 summer, in Xi'an. A big data set comprising ∼6 × 106 hourly SES from ∼5000 communities was utilized examine inequalities community-level exposure. Our results indicate that inhabitants lower are more likely be disproportionately exposed...
We present the improved constraints on couplings of solar axions and more generic bosonic dark matter particles using 737.1 kg-days data from CDEX-1B experiment. The experiment, located at China Jinping Underground Laboratory, primarily aims direct detection weakly interacting massive a p-type point-contact germanium detector. adopt profile likelihood ratio method for analysis in presence backgrounds. An energy threshold 160 eV was achieved, much better than 475 CDEX-1A with an exposure...
CDEX-50 is a next-generation project of the China Dark Matter Experiment (CDEX) that aims to search for dark matter using 50-kg germanium detector array. This paper comprises thorough summary experiment, including an investigation potential background sources and development model. Based on baseline model, projected sensitivity weakly interacting massive particle (WIMP) also presented. The expected level within energy region interest, set 2--2.5 keVee, $\sim$0.01 counts keVee$^{-1}$...
Dark matter (DM) is a major constituent of the Universe. However, no definite evidence DM particles (denoted as ``$\chi$") has been found in direct detection (DD) experiments to date. There novel concept detecting $\chi$ from evaporating primordial black holes (PBHs). We search for emitted PBHs by investigating their interaction with target electrons. The examined PBH masses range 1$\times$10$^{15}$ 7$\times$10$^{16}$ g under current limits abundance $f_{PBH}$. Using 205.4 kg$\cdot$day data...
We present the first results of search for sub-MeV fermionic dark matter absorbed by electron targets Germanium using 205.4~kg$\cdot$day data collected CDEX-10 experiment, with analysis threshold 160~eVee. No significant (DM) signals over background are observed. Results presented as limits on cross section DM--electron interaction. new constraints in DM range 0.1--10 keV/$c^2$ vector and axial-vector The upper limit is set to be $\rm 5.5\times10^{-46}~cm^2$ interaction,...
Recently a dark matter-electron (DM-electron) paradigm has drawn much attention. Models beyond the standard halo model describing DM accelerated by high energy celestial bodies are under intense examination as well. In this Letter, velocity components analysis (VCA) method dedicated to swift of DM-electron interactions via semiconductor detectors is proposed and first HPGe detector-based realized. Utilizing method, germanium based constraint on sub-GeV solar reflected interaction presented...
We present novel constraints on boosted light dark matter particles (denoted as ``$χ$'') from evaporating primordial black holes (PBHs) using 205.4 kg$\cdot$day data the China Jinping Underground Laboratory's CDEX-10 p-type point contact germanium detector with a 160 eVee analysis threshold. $χ$ PBHs masses ranging 1$\times$10$^{15}$ g to 7$\times$10$^{16}$ are searched in this work. In presence of PBH abundance compatible bounds, our result excludes $χ$-nucleon elastic-scattering cross...