Xin-Qiao Li
A5011875889- Gamma-ray bursts and supernovae
- Particle physics theoretical and experimental studies
- Ionosphere and magnetosphere dynamics
- Pulsars and Gravitational Waves Research
- Quantum Chromodynamics and Particle Interactions
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- High-Energy Particle Collisions Research
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Astrophysical Phenomena and Observations
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Cosmology and Gravitation Theories
- Geomagnetism and Paleomagnetism Studies
- earthquake and tectonic studies
- Neutrino Physics Research
- Structural Health Monitoring Techniques
- Astronomical Observations and Instrumentation
- Black Holes and Theoretical Physics
- Nuclear physics research studies
Chinese Academy of Sciences
2015-2025
Institute of High Energy Physics
2015-2025
University of Chinese Academy of Sciences
2022-2025
Southern University of Science and Technology
2025
Institute of Tibetan Plateau Research
2025
Shanghai Electric (China)
2024
Nankai University
1990-2024
Henan Provincial People's Hospital
2024
Zhengzhou University
2024
Guangzhou Institute of Geochemistry
2024
The brightest Gamma-ray burst, GRB 221009A, has spurred numerous theoretical investigations, with particular attention paid to the origins of ultra-high energy TeV photons during prompt phase. However, analyzing mechanism radiation in $\sim$MeV range been difficult because high flux causes pile-up and saturation effects most detectors. In this letter, we present systematic modeling time-resolved spectra using unsaturated data obtained from Fermi/GBM (precursor) SATech-01/GECAM-C (main...
GRB 221009A is the brightest gamma-ray burst ever detected since discovery of this kind energetic explosions. However, an accurate measurement prompt emission properties very challenging due to its exceptional brightness. With joint observations \textit{Insight}-HXMT and GECAM-C, we made unprecedentedly during first $\sim$1800 s 221009A, including precursor, main (ME, which dominates in flux), flaring early afterglow, hard X-ray soft band from $\sim$ 10 keV 6 MeV. Based on GECAM-C...
Abstract The early afterglow of a gamma-ray burst (GRB) can provide critical information on the jet and progenitor GRB. extreme brightness GRB 221009A allows us to probe its in unprecedented detail. In this Letter, we report comprehensive observation results (from T 0 +660 s +1860 s, where is Insight-HXMT/HE trigger time) X-ray/gamma-ray energy band 20 keV MeV) by Insight-HXMT High Energy X-ray Telescope, GECAM-C, Fermi/Gamma-ray Burst Monitor. We find that spectrum keV–20 MeV be well...
Abstract The minimum variation timescale (MVT) of soft gamma-ray repeaters can be an important probe to estimate the emission region in pulsar-like models, as well Lorentz factor and radius possible relativistic jet burst (GRB)–like thus revealing their progenitors physical mechanisms. In this work, we systematically study MVTs hundreds X-ray bursts (XRBs) from SGR J1935+2154 observed by Insight-HXMT, GECAM, Fermi/Gamma-ray Burst Monitor 2014 July 2022 January through Bayesian block...
As the brightest gamma-ray burst ever observed, GRB 221009A provided a precious opportunity to explore spectral line features. In this paper, we performed comprehensive spectroscopy analysis of jointly with GECAM-C and Fermi/GBM data search for emission absorption lines. For first time investigated feature throughout including most bright part where many instruments suffered problems, identified prominent lines in multiple intervals. The central energy Gaussian evolves from about 37 MeV 6...
ABSTRACT The central engine that powers gamma-ray bursts (GRBs), the most powerful explosions in universe, is still not identified. Besides hyper-accreting black holes, rapidly spinning and highly magnetized neutron stars, known as millisecond magnetars, have been suggested to power both long short GRBs. presence of a magnetar following compact star mergers particular interest it would provide essential constraints on poorly understood equation state for stars. Indirect indications these...
Abstract Gamma-ray bursts (GRBs) have been identified as one of the most promising sources for Lorentz invariance violation (LIV) studies due to their cosmological distance and energetic emission in wide energy bands. However, arrival-time difference GRB photons among different bands is affected not only by LIV effect but also poorly known intrinsic spectral lags. In previous studies, assumptions lag be made which could introduce systematic errors. this paper, we used a sample 46 short GRBs...
ABSTRACT Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) is a dedicated mission, launched in December 2020, for gamma-ray transients, including bursts (GRBs) and soft gamma repeater (SGR) the multimessenger multiwavelength astronomy era. Since GECAM consists of two independent spacecrafts (or say instruments), framework data analysis multiple distinctive from that only one spacecraft, which case most GRB missions, we developed pipeline called Energetic...
ABSTRACT Spectral lag of the low-energy photons with respect to high-energy ones is a common astrophysical phenomenon (such as gamma-ray bursts and Crab Pulsar) may serve key probe underlying radiation mechanism. However, spectral in keV range magnetar has not been systematically studied yet. In this work, we perform detailed analysis Li et al.’s Cross-Correlation Function (Li-CCF) method for SGR J1935+2154 observed by Insight-Hard X-ray Modulation Telescope (HXMT), Gravitational Wave...
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 ....
Precise direct cosmic-ray (CR) measurements provide an important probe to study the energetic particle sources in our Galaxy, and interstellar environment through which these particles propagate. Uncertainties on hadronic models, ion-nucleon cross sections particular, are currently limiting factor toward obtaining more accurate CR ion flux with calorimetric space-based experiments. We present energy-dependent measurement of inelastic section protons helium-4 nuclei (alpha particles) a...
Low-mass galaxies are the building blocks of massive in framework hierarchical structure formation. To enable detailed studies galactic ecosystems dwarf by spatially resolving different components, we have carried out Dwarf Galaxy Integral-field Survey (DGIS). This survey aims to acquire observations with spatial resolutions as high 10 100 pc while maintaining reasonably signal-to-noise ratios VLT/MUSE and ANU-2.3m/WiFeS. The whole sample will be composed 65 $M_{\rm \ast}$ $<$ 10$^{9}$ $\rm...
Digital light processing (DLP) is a high-speed, high-precision 3-dimensional (3D) printing technique gaining traction in the fabrication of ceramic composites. However, when 0-3 composites containing lead zirconate titanate (PZT) particles, widely used piezoelectric ceramic, severe density and refractive index mismatches between 2 phases pose challenges for ink synthesis process. Here, we systematically quantitatively optimized DLP PZT composites, streamlining process development providing...
Abstract Magnetars are neutron stars with ultrahigh magnetic fields (~10 14 –10 15 G). The magnetar SGR J1935+2154 is not only one of the most active magnetars detected so far, but also unique confirmed source fast radio bursts. Gravitational Wave High-energy Electromagnetic Counterpart All-sky Monitor (GECAM) dedicated to monitor gamma-ray transients all over sky, including short Here we report GECAM observations burst activity from 2021 January 2022 December, which results in a and...
Abstract This study aims to provide an accurate estimation of the intrinsic resolution LaBr 3 (Ce) crystal through a combination experimental and simulation methods. We re-analyzed data from previous Wide-Angle Compton Coincidence (WACC) Hard X-ray Calibration Facility (HXCF) experiments, conducted PMT Single-Photoelectron (SPEC) radial non-uniformity (also called Spot Scanning, SS) experiments acquire new data, combined these results with Geant4 simulations isolate contribution each...