A5030107834- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Neutrino Physics Research
- CCD and CMOS Imaging Sensors
- Semiconductor materials and devices
- Advanced Semiconductor Detectors and Materials
- Galaxies: Formation, Evolution, Phenomena
- Particle Accelerators and Free-Electron Lasers
- Advanced X-ray and CT Imaging
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Integrated Circuits and Semiconductor Failure Analysis
- Iron and Steelmaking Processes
- Wireless Sensor Networks and IoT
- Stellar, planetary, and galactic studies
- Embedded Systems and FPGA Design
- Internet Traffic Analysis and Secure E-voting
- Scientific Research and Discoveries
- Metallurgical Processes and Thermodynamics
Tsinghua University
2015-2024
Ministry of Education of the People's Republic of China
2012-2023
China Iron and Steel Research Institute Group
2023
Automation Research and Design Institute of Metallurgical Industry (China)
2023
The LHCb Outer Tracker is a gaseous detector covering an area of 5x6 m2 with 12 double layers straw tubes. its services are described together the commissioning and calibration procedures. Based on data first LHC running period from 2010 to 2012, performance readout electronics single hit resolution efficiency presented. detect in central half estimated be 99.2%, position determined approximately 200 um. received dose hottest region corresponding 0.12 C/cm, no signs gain deterioration or...
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...
We present new constraints on light dark matter boosted by cosmic rays (CRDM) using the 205.4 kg day data of CDEX-10 experiment conducted at China Jinping Underground Laboratory. The Monte Carlo simulation package CJPL\_ESS was employed to evaluate Earth shielding effect. Several key factors have been introduced and discussed in our CRDM analysis, including contributions from heavier CR nuclei than proton helium, inhomogeneity distribution, impact form factor attenuation calculation. Our...
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...
We present improved germanium-based constraints on sub-GeV dark matter via matter-electron (χ-e) scattering using the 205.4 kg·day dataset from CDEX-10 experiment. Using a novel calculation technique, we attain predicted χ-e spectra observable in high-purity germanium detectors. In heavy mediator scenario, our results achieve 3 orders of magnitude improvement for m_{χ} larger than 80 MeV/c^{2} compared to previous results. also most stringent cross-section limit date among experiments...
The CDEX-1 experiment conducted a search of low-mass (< 10 GeV/c2) Weakly Interacting Massive Particles (WIMPs) dark matter at the China Jinping Underground Laboratory using p-type point-contact germanium detector with fiducial mass 915 g physics analysis threshold 475 eVee. We report hardware set-up, characterization, data acquisition and procedures this experiment. No excess unidentified events are observed after subtraction known background. Using 335.6 kg-days data, exclusion constraints...
We present results on light weakly interacting massive particle (WIMP) searches with annual modulation (AM) analysis data from a 1-kg mass p-type point-contact germanium detector of the CDEX-1B experiment at China Jinping Underground Laboratory. Datasets total live time 3.2 yr within 4.2-yr span are analyzed threshold 250 eVee. Limits WIMP-nucleus (χ-N) spin-independent cross sections as function WIMP (m_{χ}) 90% confidence level (C.L.) derived using dark matter halo model. Within context...
We report constraints on the dark photon effective kinetic mixing parameter (${\kappa}$) with data taken from two ${p}$-type point-contact germanium detectors of CDEX-10 experiment at China Jinping Underground Laboratory. The 90\% confidence level upper limits ${\kappa}$ solar 205.4 kg-day exposure are derived, probing new space masses (${m_V}$) 10 to 300 eV/${c^2}$ in direct detection experiments. Considering as cosmological matter, ${m_V}$ 0.1 4.0 keV/${c^2}$ set 449.6 data, a minimum...
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 China Dark Matter Experiment reports results on light WIMP dark matter searches at the Jinping Underground Laboratory with a germanium detector array total mass of 20 g. physics threshold achieved is 177 eVee ("ee" represents electron equivalent energy) 50% signal efficiency. With 0.784 kg-days data, exclusion region spin-independent coupling nucleon derived, improving over our earlier bounds less than 4.6 GeV.6 MoreReceived 21 March 2014DOI:https://doi.org/10.1103/PhysRevD.90.032003©...
We investigate exotic neutrino interactions using the 205.4 kg$\cdot$day dataset from CDEX-10 experiment at China Jinping Underground Laboratory. New constraints on mass and couplings of new gauge bosons are presented. Two nonstandard considered: a $U(1)_{B-L}$ gauge-boson-induced interaction between an active electron/nucleus, dark-photon-induced sterile electron/nucleus via kinetic mixing with photon. This work probes unexplored parameter space involving coupling dark laboratory limits...
We report the results of searches for solar axions and galactic dark matter or axionlike particles with CDEX-1 experiment at China Jinping Underground Laboratory, using 335.6 kg days data from a $p$-type point-contact germanium detector. The are compatible background model, no excess signals observed. Limits on model-independent coupling ${g}_{Ae}<2.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ Compton, bremsstrahlung, atomic-recombination, deexcitation channels...
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...
We present novel constraints on boosted light dark matter particles (denoted as ``$\ensuremath{\chi}$'') from evaporating primordial black holes (PBHs) using $205.4\text{ }\text{ }\mathrm{kg}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{day}$ data the China Jinping Underground Laboratory's CDEX-10 p-type point contact germanium detector with a 160 eVee analysis threshold. $\ensuremath{\chi}$ PBHs masses ranging $1\ifmmode\times\else\texttimes\fi{}{10}^{15}\text{ }\mathrm{g}$ to...
A search for exotic dark matter (DM) in the sub-GeV mass range has been conducted using 205 kg•day data taken from a p-type point contact germanium detector of CDEX-10 experiment at China Jinping underground laboratory.New low-mass searching channels, neutral current fermionic DM absorption (χ + → ν A) and DM-nucleus 3→2 scattering χ φ A), have analyzed with an energy threshold 160 eVee.No significant signal was found, thus new limits on DM-nucleon interaction cross section are set both...
A second version ASIC for front-end detector readout, TIMPIC-II, has been developed Solid-State Photomultiplier (SSPM) based PET applications. It uses the previously and evaluated time-based-readout (TBR) architecture. However, several major changes have made to make TIMPIC-II more flexible suited applications, including adding a common energy trigger select true events using constant width integrator improve linearity. special logic unit is added combine timing pulses into one output signal...
A natural broad energy germanium (BEGe) detector is operated in the China Jinping Underground Laboratory (CJPL) for a feasibility study of building next generation experiment neutrinoless double-beta (0{$\nu\beta\beta$}) decay $^{76}$Ge. The setup prototype facility, characteristics BEGe detector, background reduction methods, and data analysis are described this paper. index 6.4$\times$10$^{-3}$ counts/(keV$\cdot$kg$\cdot$day) achieved 1.86 times lower than our previous result CDEX-1...
Monolithic scintillator detectors readout by silicon photomultiplier arrays can achieve favorable timing and spatial resolution in three dimensions hence may significantly improve the sensitivity of PET TOF-PET systems. This paper presents development a 64-channel SiPM ASIC, named DIET, with individual amplification digitization both energy information. The chip performance such as input range were optimized for continuous LYSO crystal readout. digitizer was implemented time-to-amplitude...