Yunshan Cheng
A5055952294- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Microbial Community Ecology and Physiology
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Metabolomics and Mass Spectrometry Studies
- Freshwater macroinvertebrate diversity and ecology
- Stellar, planetary, and galactic studies
- Bayesian Methods and Mixture Models
- Pharmaceutical and Antibiotic Environmental Impacts
- Environmental DNA in Biodiversity Studies
- Chemical Reactions and Isotopes
- Stochastic processes and statistical mechanics
- Quantum Chromodynamics and Particle Interactions
- Scientific Research and Discoveries
- Cosmology and Gravitation Theories
- Water Treatment and Disinfection
- Aquatic Invertebrate Ecology and Behavior
Nanjing Institute of Geography and Limnology
2023-2024
Anhui Normal University
2023-2024
Chinese Academy of Sciences
2023-2024
University of California, Los Angeles
2024
Shandong University of Science and Technology
2021-2022
Shandong University
2021-2022
We report the first dark matter search results using commissioning data from PandaX-4T. Using a time projection chamber with 3.7 tonne of liquid xenon target and an exposure 0.63 tonne·year, 1058 candidate events are identified within approximate nuclear recoil energy window between 5 100 keV. No significant excess over background is observed. Our set stringent limit to matter-nucleon spin-independent interactions, lowest excluded cross section (90% C.L.) 3.8×10^{-47} cm^{2} at mass 40 GeV/c^{2}.
We report a novel search for the cosmic-ray boosted dark matter using 100 tonne·day full dataset of PandaX-II detector located at China Jinping Underground Laboratory. With extra energy gained from cosmic rays, sub-GeV particles can produce visible recoil signals in detector. The diurnal modulations rate and spectrum are utilized to further enhance signal sensitivity. Our result excludes matter-nucleon elastic scattering cross section between 10^{-31} 10^{-28} cm^{2} masses 0.1 MeV/c^{2}...
A bstract PandaX-4T is a ton-scale dark matter direct detection experiment using dual-phase TPC technique at the China Jinping Underground Laboratory. Various ultra-low background technologies have been developed and applied to material screening for PandaX-4T, including HPGe gamma spectroscopy, ICP-MS, NAA, radon emanation measurement system, krypton assay station, alpha system. Low materials were selected assemble detector. Surface treatment procedures investigated further suppress...
Compared with the signature of dark matter elastic scattering off nuclei, absorption fermionic by nuclei opens up a new searching channel for light characteristic monoenergetic signal. In this Letter, we explore 95.0-day data from PandaX-4T commissioning run and report first dedicated results signal through neutral current process. No significant was found, lowest limit on matter-nucleon interaction cross section is set to be 1.5×10^{-50} cm^{2} mass 40 MeV/c^{2} 90% confidence level.
Precise measurement of two-neutrino double beta decay (DBD) half-life is an important step for the searches Majorana neutrinos with neutrinoless decay. We report DBD $^{136}$Xe using PandaX-4T dual-phase Time Projection Chamber (TPC) 3.7-tonne natural xenon and first 94.9-day physics data release. The background model in fiducial volume well constrained situ by events outer active region. With a exposure 15.5 kg-year, we establish as $2.27 \pm 0.03 (stat.)\pm 0.10 (syst.)\times 10^{21}$...
Hyperorder cumulants ${C}_{5}/{C}_{1}$ and ${C}_{6}/{C}_{2}$ of net-baryon distributions are anticipated to offer crucial insights into the phase transition from quark-gluon plasma hadronic matter in heavy-ion collisions. However, accuracy ${C}_{5}$ ${C}_{6}$ is highly contingent on fine shape distribution's tail, detectable range which could be essentially truncated by low statistics. In this paper, we use fast Skellam-based simulations, as well ultrarelativistic quantum molecular dynamics...
Intraguild predation (IGP) can have a significant impact on phytoplankton biomass, but its effects their diversity and assemblage composition are not well understood. In this study, we constructed an IGP model based the common three-trophic food chain of “fish (or shrimp)–large branchiopods (Daphnia)–phytoplankton”, investigated in outdoor mesocosms using environmental DNA high-throughput sequencing. Our results indicated that alpha diversities (number amplicon sequence variants Faith’s...
Neutron-induced nuclear recoil background is critical to the dark matter searches in PandaX-4T liquid xenon experiment. This paper studies feature of neutron and evaluates their contribution single scattering events through three methods. The first method fully Monte Carlo simulation based. last two are data-driven methods that also use multiple signals high energy data, respectively. In commissioning data with an exposure 0.63 tonne-year, all these give a consistent result there...
Hyper-order cumulants $C_5/C_1$ and $C_6/C_2$ of net-baryon distributions are anticipated to offer crucial insights into the phase transition from quark-gluon plasma hadronic matter in heavy-ion collisions. However, accuracy $C_5$ $C_6$ is highly contingent on fine shape distribution's tail, detectable range which could be essentially truncated by low statistics. In this paper, we use fast Skellam-based simulations, as well Ultrarelativistic Quantum Molecular Dynamics model, assess impact...
Precise measurement of two-neutrino double beta decay (DBD) half-life is an important step for the searches Majorana neutrinos with neutrinoless decay. We report DBD $^{136}$Xe using PandaX-4T dual-phase Time Projection Chamber (TPC) 3.7-tonne natural xenon and first 94.9-day physics data release. The background model in fiducial volume well constrained situ by events outer active region. With a exposure 15.5 kg-year, we establish as $2.27 \pm 0.03 (stat.)\pm 0.10 (syst.)\times 10^{21}$...
The dual-phase xenon time projection chamber (TPC) is one of the most sensitive detector technology for dark matter direct search, where energy deposition incoming particle can be converted into photons and electrons through excitation ionization. response to signal varies significantly with electric field in liquid xenon. We study detector's light yield its dependence on PandaX-II containing 580~kg volume. From our measurements, at fields from 0~V/cm 317~V/cm obtained depositions up 236~keV.