A5100456023- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Scientific Research and Discoveries
- Noncommutative and Quantum Gravity Theories
- Stellar, planetary, and galactic studies
- Pulsars and Gravitational Waves Research
- Economic and Environmental Valuation
- Quantum Electrodynamics and Casimir Effect
- Gamma-ray bursts and supernovae
- Physics of Superconductivity and Magnetism
- Radiation Detection and Scintillator Technologies
- Nonlinear Waves and Solitons
- Advanced NMR Techniques and Applications
- Land Use and Ecosystem Services
- Environmental Quality and Pollution
- Aviation Industry Analysis and Trends
- Computational Physics and Python Applications
Yangzhou University
2024-2025
Xi'an Jiaotong University
2024-2025
University of Maryland, College Park
2018-2024
Seattle University
2023-2024
Hunan Normal University
2023-2024
University of Washington
2024
Campbell Collaboration
2023
Shanghai Jiao Tong University
2017
We report a new search of weakly interacting massive particles (WIMPs) using the combined low background data sets in 2016 and 2017 from PandaX-II experiment China. The latest set contains exposure 77.1 live day, with reduced to level 0.8$\times10^{-3}$ evt/kg/day, improved by factor 2.5 comparison previous run 2016. No excess events were found above expected background. With total 5.4$\times10^4$ kg most stringent upper limit on spin-independent WIMP-nucleon cross section was for WIMP mass...
We report constraints on light dark matter through its interactions with shell electrons in the PandaX-II liquid xenon detector a total $46.9\text{ }\text{ }\mathrm{tonnes}/\mathrm{day}$ exposure. To effectively search for these very low energy electron recoils, ionization-only signals are selected from data. 1821 candidates identified within an ionization signal range between 50 and 75 photoelectrons, corresponding to mean electronic recoil 0.08 0.15 keV. The 90% C.L. exclusion limit...
We present PandaX-II constraints on candidate WIMP-nucleon effective interactions involving the nucleon or WIMP spin, including, in addition to standard axial spin-dependent (SD) scattering, various couplings among vector and currents, magnetic electric dipole moments, tensor interactions. The data set corresponding a total exposure of 54-ton-days is reanalyzed determine as function mass isospin coupling. obtain cross section bounds $\rm 1.6 \times 10^{-41} cm^2$ 9.0 10^{-42} ($90\%$ c.l.)...
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}...
We report the search results of light dark matter through its interactions with shell electrons and nuclei, using commissioning data from PandaX-4T liquid xenon detector. Low energy events are selected to have an ionization-only signal between 60 200 photoelectrons, corresponding a mean nuclear recoil 0.77 2.54 keV electronic 0.07 0.23 keV. With effective exposure 0.55 tonne$\cdot$year, we set most stringent limits within mass range 40 $\rm{MeV/c^2}$ 10 $\rm{GeV/c^2}$ for point-like...
In this paper, we investigate the quasinormal mode (QNM) spectra for scalar perturbation over quantum-corrected black hole (BH) known as quantum Oppenheimer-Snyder (qOS) BH. The fundamental modes of qOS BH exhibit two key properties. First, there is a nonmonotonic behavior concerning parameter zero multipole number. Second, gravity effects result in slower decay modes. For higher overtones, significant deviation becomes evident between frequencies (QNFs) and Schwarzschild BHs. intervention...
Abstract This paper explores the properties of quasinormal modes (QNMs) a regular black hole (BH) characterized by Minkowski core and sub-Planckian curvature. When focusing on special case, this BH exhibits identical large-scale behavior with Hayward some loop quantum gravity corrected (LQG-corrected) BH. A notable characteristic QNMs in is pronounced outburst overtones when compared to Schwarzschild (SS-BH). can be attributed deviation from SS-BH near-horizon geometry region due effect....
Xe134 is a candidate isotope for neutrinoless double beta decay (0νββ) search. In addition, the two-neutrino case (2νββ) allowed by standard model of particle physics has not yet been observed. With 656-kg natural xenon in fiducial volume PandaX-4T detector, which contains 10.4% Xe134, and its initial 94.9-day exposure, we have established most stringent constraints on 2νββ 0νββ half-lives, with limits 2.8×1022 yr 3.0×1023 at 90% confidence level, respectively. The limit surpasses previously...
We report the dark matter search results obtained using full 132 ton$\cdot$day exposure of PandaX-II experiment, including all data from March 2016 to August 2018. No significant excess events is identified above expected background. Upper limits are set on spin-independent matter-nucleon interactions. The lowest 90% confidence level exclusion cross section $2.2\times 10^{-46}$ cm$^2$ at a WIMP mass 30 GeV/$c^2$.
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...
We investigate the scalar field system over a charged Weyl black hole, depicted by parameter $\ensuremath{\lambda}$. It is found that imaginary part of quasinormal mode spectra always negative and perturbation does not increase with time, indicating stable under perturbation. Furthermore, Hawking radiation exhibit qualitatively similar characteristic in they both rise rising $\ensuremath{\lambda}$ approach constant when large enough. Especially, we would like to emphasize an exponential...
We report results of a search for dark-matter–nucleon interactions via dark mediator using optimized low-energy data from the PandaX-4T liquid xenon experiment. With ionization-signal-only and utilizing Migdal effect, we set most stringent limits on cross section matter masses ranging 30 MeV/c2 to 2 GeV/c2. Under assumption that is photon decays into scalar pairs in early Universe, rule out significant parameter space such thermal relic dark-matter model.Received 4 August 2023Revised 23...
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 $2.27 \pm 0.03 (stat.)\pm 0.10 (syst.)\times 10^{21}$...
We report the Neutrino-less Double Beta Decay (NLDBD) search results from PandaX-II dual-phase liquid xenon time projection chamber. The total live used in this analysis is 403.1 days June 2016 to August 2018. With NLDBD-optimized event selection criteria, we obtain a fiducial mass of 219 kg natural xenon. accumulated exposure 242 kg$\cdot$yr, or equivalently 22.2 kg$\cdot$yr $^{136}$Xe exposure. At region around decay Q-value 2458 keV, energy resolution 4.2%. find no evidence NLDBD and...
Abstract We present a systematic determination of the responses PandaX-II, dual phase xenon time projection chamber detector, to low energy recoils. The electron recoil (ER) and nuclear (NR) are calibrated, respectively, with injected tritiated methane or 220 Rn source, 241 Am-Be neutron in an range from 1-25 keV 4-80 (NR), under two drift fields, 400 317 V/cm. An empirical model is used fit light yield charge for both types best models can describe calibration data significantly....
Searching for the Neutrinoless Double Beta Decay (NLDBD) is now regarded as topmost promising technique to explore nature of neutrinos after discovery neutrino masses in oscillation experiments. PandaX-III (Particle And Astrophysical Xenon Experiment III) will search NLDBD $^{136}$Xe at China Jin Ping underground Laboratory (CJPL). In first phase experiment, a high pressure gas Time Projection Chamber (TPC) contain 200 kg, 90% enriched operated 10 bar. Fine pitch micro-pattern detector...