A5102990156- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Cosmology and Gravitation Theories
- Quantum Chromodynamics and Particle Interactions
- Radioactive Decay and Measurement Techniques
- CCD and CMOS Imaging Sensors
- Ion-surface interactions and analysis
- Astrophysics and Cosmic Phenomena
- Advanced Bandit Algorithms Research
- Water Quality Monitoring and Analysis
- Asian Studies and History
- Quantum Electrodynamics and Casimir Effect
- Crop Yield and Soil Fertility
- Legume Nitrogen Fixing Symbiosis
- Smart Grid Energy Management
- Photocathodes and Microchannel Plates
- Communication Studies and Media
- Soil Carbon and Nitrogen Dynamics
- Radiation Effects in Electronics
Tsinghua University
2011-2024
Ministry of Education of the People's Republic of China
2023
Nanjing University of Aeronautics and Astronautics
2019
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...
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...
In the classic Bayesian restless multi-armed bandit (RMAB) problem, there are N arms, with rewards on all arms evolving at each time as Markov chains known parameters. A player seeks to activate K ≥ 1 in order maximize expected total reward obtained over multiple plays. RMAB is a challenging problem that be PSPACE-hard general. We consider this work even harder non-Bayesian RMAB, which parameters of chain assumed unknown priori. develop an original approach applicable when corresponding has...
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...
Literary works are closely interwoven with the social fabric of their era, mirroring lived experiences and issues general population faces. This study employs a qualitative research method to analyze content two works, The True Story Ah Q Earth Mankind regarding topic marking connection, continuity, transformation, deepening. It then elucidates similarities differences in reality cultural mentality by investigating selection expression. findings indicate that emphasizes individual's fate,...
Abstract We search for nuclear recoil signals of dark matter models with a light mediator using data taken
from p-type point-contact germanium detector the CDEX-10 experiment at China Jinping
Underground Laboratory. The 90% confidence level upper limits on DM-nucleon interaction
cross section from 205.4 kg-day exposure are derived, excluding new parameter space in 2∼3
GeV DM mass when is comparable to or lighter than typical momentum
transfer. further...
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...
Abstract A Geant4-based simulation framework for rare event searching experiments with germanium detectors named SAGE is presented details. It designed simulating, assessing background distribution, and investigating the response of detectors. The incorporates its experiment-specific geometries custom attributes, including generators, physics lists output format, to satisfy various objectives. Its docker image has been prepared virtualizing distributing framework. Deployment a will be...
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...
Abstract China Jinping underground laboratory (CJPL) is located in the Mountain, Sichuan Province, southwest China, with a rock overburden of about 2400m, and it currently deepest world, will become one largest completion its extension project (CJPL-II). Based on CJPL-II, Deep Underground ultra-low Radiation Background Facility for frontier physics experiments (DURF) was approved November 2019 started construction December 2020. The scientific at CJPL mainly focused dark matter detection,...
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 search for nuclear recoil signals of dark matter models with a light mediator using data taken from p-type point-contact germanium detector the CDEX-10 experiment at China Jinping Underground Laboratory. The 90% confidence level upper limits on DM-nucleon interaction cross section 205.4 kg-day exposure are derived, excluding new parameter space in 2~5 GeV DM mass when is comparable to or lighter than typical momentum transfer. further interpret our results constrain specific...
Abstract Exploring hit positions of recorded events can help to understand and suppress backgrounds in rare event searches. We propose a pulse shape analysis method discriminate single-site (SSEs) the inner outer layer small contact P-type germanium detector (HPGe). SSEs have different features, which rise time $$(T_{Q})$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mo>(</mml:mo> <mml:msub> <mml:mi>T</mml:mi> <mml:mi>Q</mml:mi> </mml:msub> <mml:mo>)</mml:mo>...
Abstract The monitoring of marine 137 Cs using a scintillation detector relies on the spectrum analysis method to extract concentration. However, when in poor statistics situation, calculation result traditional net-peak-area (NPA) has large uncertainty. In this paper, therefore, new machine-learning-based is presented better analyze gamma-ray spectra with low A multilayer perceptron (MLP) applied 662-keV full energy peak seawater spectra; MLP can be trained few measured background by...