Zhao-Qiang Shen
A5028208290- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Gamma-ray bursts and supernovae
- Particle physics theoretical and experimental studies
- Pulsars and Gravitational Waves Research
- Nuclear Physics and Applications
- Astronomy and Astrophysical Research
- Scientific Research and Discoveries
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Neutrino Physics Research
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Particle accelerators and beam dynamics
- Advanced X-ray and CT Imaging
- Nuclear reactor physics and engineering
Purple Mountain Observatory
2016-2025
Chinese Academy of Sciences
2016-2025
University of Science and Technology of China
2017-2023
Shanghai Astronomical Observatory
2023
University of Chinese Academy of Sciences
2015-2020
University of Geneva
2019
Istituto Nazionale di Fisica Nucleare, Sezione di Bari
2019
Campbell Collaboration
2017
Tsinghua University
2006
Institute of Atomic Energy
1987
The precise measurement of the spectrum protons, most abundant component cosmic radiation, is necessary to understand source and acceleration rays in Milky Way. This work reports ray proton fluxes with kinetic energies from 40 GeV 100 TeV, two a half years data recorded by DArk Matter Particle Explorer (DAMPE). first time an experiment directly measures protons up ~100 TeV high statistics. measured confirms spectral hardening found previous experiments reveals softening at ~13.6 index...
The measurement of the energy spectrum cosmic ray helium nuclei from 70 GeV to 80 TeV using 4.5 years data recorded by Dark Matter Particle Explorer (DAMPE) is reported in this work. A hardening observed at an about 1.3 TeV, similar previous observations. In addition, a spectral softening 34 revealed for first time with large statistics and well controlled systematic uncertainties, overall significance 4.3σ. DAMPE measurements both protons suggest particle charge dependent energy, although...
Recently, the NANOGrav, PPTA, EPTA and CPTA collaborations reported compelling evidence of existence Stochastic Gravitational-Wave Background (SGWB). The amplitude spectrum this inferred gravitational-wave background align closely with astrophysical predictions for a signal originating from population supermassive black-hole binaries. In light these findings, we explore possibility to detect dark matter spikes surrounding massive black holes, which could potentially impact waveform modulate...
ABSTRACT Precise measurements of the stellar orbits around Sagittarius A* have established existence a supermassive black hole (SMBH) at Galactic centre (GC). Due to interplay between SMBH and dark matter (DM), DM density profile in innermost region Galaxy, which is crucial for indirect detection, still an open question. Among most popular models literature, theoretical spike proposed by Gondolo & Silk (GS hereafter) well adopted. In this work, we investigate using updated data from Keck...
On 17 August 2017, a gravitational wave event (GW170817) and an associated short gamma-ray burst (GRB 170817A) from binary neutron star merger had been detected. The followup optical/infrared observations also identified the macronova/kilonova emission (AT2017gfo). In this work we discuss some implications of remarkable GW170817/GRB 170817A/AT2017gfo association. We show that $\sim 1.7$s time delay between (GW) GRB signals imposes very tight constraint on superluminal movement waves (i.e.,...
Very recently the Dark Energy Survey (DES) Collaboration has released their second group of Dwarf spheroidal (dSph) galaxy candidates. With publicly-available Pass 8 data Fermi-LAT we search for $\gamma-$ray emissions from directions these eight newly discovered dSph No statistically significant signal been found in combined analysis sources. empirically estimated J-factors sources, constraint on annihilation channel $\chi\chi \rightarrow \tau^{+}\tau^{-}$ is comparable to bound set by joint...
The DArk Matter Particle Explorer (DAMPE), a high energy cosmic ray and $\gamma$-ray detector in space, has recently reported the new measurement of total electron plus positron flux between 25 GeV 4.6 TeV. A spectral softening at $\sim0.9$ TeV tentative peak $\sim1.4$ have been reported. We study physical implications DAMPE data this work. presence break significantly tightens constraints on model parameters to explain electron/positron excesses. can either be explained by maximum...
Galaxy clusters are the largest gravitationally bound objects in universe and may be suitable targets for indirect dark matter searches. With 85 months of Fermi-LAT Pass 8 publicly available data, we analyze gamma-ray emission directions 16 nearby Clusters with an unbinned likelihood analysis. No globally statistically-significant $γ-$ray line feature is identified a tentative signal present at $\sim 43$ GeV. The 95\% confidence level upper limits on velocity-averaged cross section particles...
Recent observations of the light component cosmic-ray spectrum have revealed unexpected features that motivate further and more precise measurements up to highest energies. The Dark Matter Particle Explorer is a satellite-based experiment has been operational since December 2015, continuously collecting data on high-energy cosmic particles with very good statistics, energy resolution, particle identification capabilities. In this work, latest proton+helium in range from 46 GeV 464 TeV are...
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...
Detection of spectral line in gamma-ray bursts (GRBs) is importance for studying GRB physics, as it provides insights into the composition and physical conditions environment. However, progress detecting X-ray or emission absorption lines spectra has been relatively slow, only narrow feature about 10 MeV found 221009A exhibited a significance exceeding 5σ. Here, we report probable evidence at 2.1 mega-electron volts (MeV) spectrum 221023A. The highest statistical this observed time interval...
A group of massive galaxies at redshifts $z\gtrsim 7$ have been recently detected by the James Webb Space Telescope (JWST), which were unexpected to form so early within framework standard Big Bang cosmology. In this work, we propose that puzzle can be explained presence some primordial black holes (PBHs) with a mass $\sim 1000 M_\odot$. These PBHs, clothed in dark matter halo and undergoing super-Eddington accretion, serve as seeds for galaxy formation masses 10^{8}-10^{10}~M_\odot$ high...
Ultralight bosonic dark matter is expected to be able form a cloud surrounding the supermassive black hole (SMBH) in Galactic center. With increasing precision of observations stellar kinematics around SMBH, tiny effects from such cloud, including its gravitational perturbation and direct coupling with ordinary may detectable. In this work, we search for possible evidence scalar using accurate orbital measurements S2 star Sgr ${\mathrm{A}}^{*}$. We solve first order post-Newtonian equation,...
With the accurate cosmic ray (CR) electron and positron spectra (denoted as $\Phi_{\rm e^{-}}$ e^{+}}$, respectively) measured by AMS-02 collaboration, difference between fluxes (i.e., $\Delta \Phi=\Phi_{\rm e^{-}}-\Phi_{\rm e^{+}}$), dominated propagated primary electrons, can be reliably inferred. In standard model, spectrum of CR electrons at energies $\geq 30$ GeV softens with increase energy. The absence any evidence for such a continuous spectral softening in \Phi$ strongly suggests...
The DArk Matter Particle Explorer (DAMPE), also known as Wukong in China, which was launched on 2015 December 17, is a new high energy cosmic ray and γ-ray satellite-borne observatory. One of the main scientific goals DAMPE to observe GeV-TeV γ-rays with accurate energy, angular time resolution, indirectly search for dark matter particles study astrophysics. Due comparatively higher fluxes charged rays respect γ-rays, it challenging identify sufficiently efficiency, minimizing amount...
Recent observations of the light component cosmic-ray spectrum have revealed unexpected features that motivate further and more precise measurements up to highest energies. The Dark Matter Particle Explorer is a satellite-based experiment has been operational since December 2015, continuously collecting data on high-energy cosmic particles with very good statistics, energy resolution, particle identification capabilities. In this work, latest proton+helium in range from 46 GeV 464 TeV are...
A bstract This study reanalyzes the detection prospects of dark matter (DM) annihilation signals in Galactic Center, focusing on velocity-dependent dynamics within a spike density near supermassive black hole (Sgr ⋆ ). We investigate three processes — p -wave, resonance, and forbidden under semi-relativistic velocities, leveraging gamma-ray data from Fermi DAMPE telescopes. Our analysis integrates fermionic DM model with an electroweak axion-like particle (ALP) portal, exploring into two or...
We have precisely measured reaction cross sections (σR) for 8Li using 9Be, 12C, 27Al, and proton targets at intermediate energies by the transmission method. From energy dependence of σR including high data, density distribution was deduced through a modified Glauber model. It is shown that has shorter tail structure in as compared with 8B matter radius similar to those other nonhalo Li isotopes. The result consistent previous experiments there tendency be skin nucleus.Received 7 July...
GeV gamma ray is an important observation target of DArk Matter Particle Explorer (DAMPE) for indirect dark matter searching and high energy astrophysics. We present in this work a set accurate instrument response functions DAMPE (DmpIRFs) including the effective area, point-spread function dispersion that are crucial gamma-ray data analysis based on statistics simulation data. A dedicated software named DmpST developed to facilitate scientific analyses Considering limited number photons...