A5052474197- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Nuclear physics research studies
- Advanced Chemical Physics Studies
- Spectroscopy and Quantum Chemical Studies
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Ionosphere and magnetosphere dynamics
- Advanced biosensing and bioanalysis techniques
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Cosmology and Gravitation Theories
- Plasma Diagnostics and Applications
- Laser-induced spectroscopy and plasma
- Optimal Power Flow Distribution
- Electric Power System Optimization
- Radioactive element chemistry and processing
- Industrial Vision Systems and Defect Detection
- 3D IC and TSV technologies
- Astro and Planetary Science
- Astronomical and nuclear sciences
- DNA and Nucleic Acid Chemistry
- Infrared Target Detection Methodologies
- Nuclear reactor physics and engineering
- Surface Roughness and Optical Measurements
Institute of Applied Physics and Computational Mathematics
2022-2024
Beijing Normal University
2005-2024
Nagase ChemteX (Japan)
2023
Tiangong University
2021
Beijing Radiation Center
2012-2019
Chinese Academy of Sciences
2017
Institute of Modern Physics
2017
Nantong University
2017
Peking University
2015
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...
The N=130 short-lived isotope 223Np was produced as evaporation residue (ER) in the fusion reaction 40Ar + 187Re at gas-filled recoil separator Spectrometer for Heavy Atom and Nuclear Structure (SHANS). It identified through temporal spatial correlations with α decays of 215Ac and/or 211Fr, third fourth members α-decay chain starting from 223Np. pileup signals ER(223Np)–α(223Np)–α(219Pa) were resolved by using digital pulse processing technique. An decay half-life T1/2=2.15(52100) μs energy...
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...
Fluorine is one of the most interesting elements in nuclear astrophysics, where ^{19}F(p,α)^{16}O reaction crucial importance for Galactic ^{19}F abundances and CNO cycle loss first generation Population III stars. As a day-one campaign at Jinping Underground Nuclear Astrophysics experimental facility, we report direct measurements essential ^{19}F(p,αγ)^{16}O channel. The γ-ray yields were measured over E_{c.m.}=72.4-344 keV, covering Gamow window; our energy 72.4 keV unprecedentedly low,...
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 competition between Na${}^{+}$ and Rb${}^{+}$ ions in the minor groove of a synthetic B-DNA dodecamer d (CGCGAATTCGCG) is studied using molecular dynamics simulations as ratio these two changing from 9:1 to 1:9 with DNA merged into solvent water molecule at 298 K. When concentration increases, minority majority, are gradually released A tract, binding sites occupied by ions, extending tract whole groove. Comparing conformation influenced strongly ions.
We calculate electron capture and ionization cross sections of ${\mathrm{N}}_{2}$ impacted by the ${\mathrm{H}}^{+}$ projectile at keV energies. To this end, we employ time-dependent density-functional theory coupled nonadiabatically to molecular dynamics. avoid explicit treatment complex density matrix in calculation sections, propose an approximate method based on assumption constant rate over period passing absorbing boundary. Our results agree reasonably well with experimental data...
The multinucleon transfer (MNT) reaction has aroused wide interest in recent years largely due to its ability produce neutron-rich heavy nuclei. semiclassical model GRAZING can describe well the experimental MNT data for many medium-heavy systems, but only simply considers neutron evaporation deexcitation of primary fragments. In order final products and even superheavy we try consider both subsequent processes by combining, first time, statistical-decay GEMINI as improved version GEMINI++....
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}$...
Using time-dependent density-functional theory at the level of local density approximation augmented by a self-interaction correction and coupled non-adiabatically to molecular dynamics, we study, from theoretical perspective, scattering dynamics proton in collisions with N2 molecule 30 eV. Nine different collision configurations are employed analyze energy loss spectra, electron depletion, angles effects. Our results agree qualitatively experimental data previous calculations. The...
It is known that ion-focused regime (IFR) can effectively suppress expansion of a relativistic electron beam (REB). Using the particle-in-cell Monte Carlo collision (PIC-MCC) method, we numerically investigate propagation an REB in neutral gas. The results demonstrate body charge neutralization and stable IFR be established. As result, transverse dimensions longitudinal velocities keep close to initial parameters. We also calculate current factors REB. Combined with envelope equations,...
In this paper, the propagation loss of 0.14 THz signal propagating for 27 km at sea is measured experimentally and compared with simulation results model in International Telecommunication Union-Radiocommunication Sector (ITU-R). The show that average difference between simulated experimental values received power -5.2 dB, all overestimate loss. Considering evaporation duct ubiquitous marine atmosphere may affect characteristics terahertz wave, a new computational proposed. More than half...
The solar composition problem has puzzled astrophysicists for more than 20 years. Recent measurements of carbon-nitrogen-oxygen (CNO) neutrinos by the Borexino experiment show a $\sim2\sigma$ tension with "low-metallicity" determinations. $^{14}$N$(p,\gamma)^{15}$O, slowest reaction in CNO cycle, plays crucial role standard model (SSM) calculations neutrino fluxes. Here we report direct measurement $^{14}$N$(p,\gamma)^{15}$O reaction, which $S$-factors all transitions were simultaneously...
This paper reports a silicon-silicon anodic bonding process based on embedded glass. We successfully glass into patterned silicon groove by fusion treatment and bonded it with another wafer process. realizes the precise control of pattern depth gap without electrical connection between two wafers. Tension test result shows that strength is over 7MPa-which in accordance normal process, so can be used wide range MEMS devices design.
The design of the collimator for dynamic infrared (IR) scene simulation based on digital micro-mirror devices (DMD) is present in this paper. adopts a reimaging configuration to limit physical size availability and cost. aspheric lens used relay optics improve image quality simplify configuration. total internal reflection (TIR) prisms located between last surface DMD fold raypaths IR light source. collimates output from 1024×768 element 8~10.3μm waveband enables an imaging system be tested...
The power industry has natural monopoly. In the process of electricity market reform in market, will not and cannot be completely deregulated. Electricity market-oriented is an inevitable trend development electric all countries world. Its purpose to break vertical monopoly operation mode industry, establish a on sale side, realize mechanism bidding for grid connection. analysis divided into pre-analysis ex-post analysis, among which pre-market more helpful regulators intervene market. This...
Abstract The emission of artificial electron beams causes an active spacecraft charging effect that poses challenges for beam sounding experiments. Plasma contactors have been suggested as a potential solution to this issue based on theoretical and simulation studies, but the impact these potentials in complex space environments remains unexplored. This paper investigates fast under action plasma geostationary Earth orbit environment by using two‐dimensional Particle‐in‐Cell model. We...
The process of multielectron transfer from a Na 4 cluster induced by highly charged C 6+ , 4+ 2+ and + ions is studied using the method time-dependent density functional theory within local approximation combined with use pseudopotential. evolution dipole moment changes emitted electrons in obtained probabilities various charges are deduced. It shown that strongly ionized number per atom larger than 2 under same condition. One can find detailed information different which possibly related to...
Short-lived \(\alpha \) emitters with N = 128–131 and Z 91–93 were studied in the fusion reaction ^40Ar + ^187Re using digital pulse processing technique at gas-filled recoil separator Spectrometer for Heavy Atom Nuclear Structure (SHANS). Two new isotopes ^223,224Np identified decay of 220 Pa was re-investigated through temporal spatial correlations. The pileup signals resolved by technique. An half-life \(T_{1/2} 2.15(_{52}^{100})\) μs energy \(E_{\alpha } 9477(44)\) keV attributed to...
Composite materials will inevitably have defects and suffer damage during the manufacturing using. In order to achieve accurate efficient non-destructive testing of composite materials, an automatic detection system for internal based on electronic speckle pattern interferometry (ESPI) is designed. The uses collected stripes as defect carrier, realizes in material by identifying image. First all, expand field view collection light path, we complete construction hardware path combining 4f...