Mingjun Chen
A5100631002- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Gamma-ray bursts and supernovae
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- CCD and CMOS Imaging Sensors
- Radio Wave Propagation Studies
- Precipitation Measurement and Analysis
- Geophysics and Gravity Measurements
- Atmospheric Ozone and Climate
- Spectroscopy and Laser Applications
- Particle Accelerators and Free-Electron Lasers
- Calibration and Measurement Techniques
- Infrared Target Detection Methodologies
- Pulsars and Gravitational Waves Research
- Radiation Therapy and Dosimetry
- Atomic and Subatomic Physics Research
- IL-33, ST2, and ILC Pathways
- Lightning and Electromagnetic Phenomena
- Eosinophilic Esophagitis
- Inflammasome and immune disorders
- Photocathodes and Microchannel Plates
Institute of High Energy Physics
2010-2024
Chinese Academy of Sciences
2011-2024
Gansu Great Wall Electrical and Electronics Engineering Research Institute
2024
Chinese PLA General Hospital
2024
Campbell Collaboration
2023
Southwest Jiaotong University
2023
University of Chinese Academy of Sciences
2023
Guangxi University
2021
Shanghai Jiao Tong University
2021
Purple Mountain Observatory
2021
We present results of a study neutrino oscillation based on 766 ton-year exposure KamLAND to reactor anti-neutrinos. observe 258 \nuebar\ candidate events with energies above 3.4 MeV compared 365.2 expected in the absence oscillation. Accounting for 17.8 background events, statistical significance \nuebar disappearance is 99.998%. The observed energy spectrum disagrees spectral shape at 99.6% and prefers distortion from effects. A two-neutrino analysis data gives \DeltaMSq =...
Abstract The Large High Altitude Air Shower Observatory (LHAASO) (Fig. 1) is located at Mt. Haizi (4410 m a.s.l., 600 g/cm 2 , 29° 21’ 27.56” N, 100° 08’ 19.66” E) in Daocheng, Sichuan province, P.R. China. LHAASO consists of 1.3 km array (KM2A) electromagnetic particle detectors (ED) and muon (MD), a water Cherenkov detector (WCDA) with total active area 78,000 18 wide field-of-view air telescopes (WFCTA) newly proposed electron-neutron (ENDA) covering 10,000 . Each synchronized all the...
We present the first catalog of very-high energy and ultra-high gamma-ray sources detected by Large High Altitude Air Shower Observatory (LHAASO). The was compiled using 508 days data collected Water Cherenkov Detector Array (WCDA) from March 2021 to September 2022 933 recorded Kilometer Squared (KM2A) January 2020 2022. This represents main result most sensitive large coverage survey sky above 1 TeV, covering declination $-$20$^{\circ}$ 80$^{\circ}$. In total, contains 90 with an extended...
The Large High Altitude Air Shower Observatory (LHAASO) has observed tens of gamma-ray sources with significant emission above 100 TeV. These are probably the Galactic accelerators PeV cosmic-rays. Thus, high energy neutrinos TeV expected to be from these PeVatron candidates. We propose Huge Underwater high-energy Neutrino Telescope (HUNT) instrumented volume up 30 ${\rm km^{3}}$ search for neutrino TeV, which will help us identify PeVatrons in our Galaxy and understand acceleration...
The Wide Field-of-View Cherenkov Telescope Array (WFCTA) and the Water Detector Arrays (WCDA) of LHAASO are designed to work in combination for measuring energy spectra various cosmic ray species over a very wide range from few TeV 10 PeV. calibration WCDA can be achieved with proven technique westward shift Moon shadow galactic rays due geomagnetic field. This deflection angle $\Delta$ is inversely proportional rays. precise measurements shifts by allows us calibrate its scale energies as...
Wuwei Kushen Changrong capsule (Composite
As one of the important parts LHAASO Project, Water Cherenkov Detector Array (WCDA) is planned to be built in Yangbajing, Tibet, China soon. In order fully understand engineering issues and basic performance water detection technique, a prototype detector has been operat- ed Beijing, an array constructed on site. With help detector, related cosmic muon signals quality maintenance studied acquired. Studies are also progressing smoothly: nine 8-in PMTs their electronics DAQ systems have...
The Water Cherenkov Detector Array (WCDA), which is one of the main components Large High Altitude Air Shower Observatory (LHAASO), functions in surveying northern sky for high-energy gamma ray sources at energy range around 100 GeV–30 TeV. precision time measurement shower particles hitting every detector array directly associated with detection sensitivity sources. calibration offsets among cells should be less than 0.1 ns to obtain 0.1o pointing error any point source. In this regard,...
The Large High Altitude Air Shower Observatory (LHAASO) has three sub-arrays, KM2A, WCDA and WFCTA. flux variations of cosmic ray air showers were studied by analyzing the KM2A data during thunderstorm on 10 June 2021. number shower events that meet trigger conditions increases significantly in atmospheric electric fields, with maximum fractional increase 20%. rates (increases or decreases) are found to be strongly dependent primary zenith angle. secondary particles significantly, following...
The Large High Altitude Air Shower Observatory (LHAASO) is to be built at Daocheng, Sichuan Province, China. As one of the major components LHAASO project, a Water Cherenkov Detector Array (WCDA), with an area 78000 m2, contains 350000 tons purified water. water transparency and its stability are critical for successful long-term operation this project. To gain full knowledge technique investigate engineering issues, 9-cell detector array has been Yangbajing site, Tibet, With help...
It is prpopsed that a water Cherenkov detector array, LHAASO-WCDA, to be built at Shangri-la, Yunnan Province, China. As one of the major components LHAASO project, main purpose it survey northern sky for gamma ray sources in energy range 100 GeV−30 TeV. In order design array efficiently economize budget, Monte Carlo simulation carried out. With help simulation, cost performance different configurations are obtained and compared with each other, serving as guide more detailed experiment next step.
The Large High Altitude Air Shower Observatory (LHAASO) will be constructed at Mountain Haizi, in Sichuan Province, China (4410m a.s.l.). Water Cherenkov Detector Array (WCDA), one of the major component LHAASO, focus on surveying northern sky for gamma ray sources from 100 GeV to 30 TeV. whole WCDA, owing an area 78,000 m^{2}, is subdividing into 3120 detector cells (5×5 m^{2} each, with a water depth 4m). Every cell has 8 or 9-in PMT residing bottom collect lights produced by charged...
In the Large High Altitude Air Shower Observatory (LHAASO), main physics objectiveof Water Cherenkov Detector Array (WCDA) is to survey gamma-ray sky continuouslyin energy range from 100 GeV PeV. The detector array, covering an area of about 78,000𝑚$^2$ area, constituted by 3120 units divided into 3 separate arrays. second and third array are installed 2220 20" PMTs instead 8 PMT usedin first 150×150𝑚$^2$ array. This type has large sensitive high quantum efficiency (QE), peak-to-valley (P/V)...
The charge response of the detector is very important for data reconstruction and energy spectrum analysis. In this paper, LHAASO large size PMT studied in depth, including difference detection efficiency between MCP Dynode structure PMTs, a calibration nonlinear method based on continuous optical attenuator proposed. After correction from calibration, experimental can reach good agreement with simulation results.
The Large High Altitude Air Shower Observatory project is proposed to study high energy gamma ray astronomy ( 40 GeV-1 PeV ) and cosmic physics 20 TeV-1 EeV ). wide field of view Cherenkov telescope array, as a component the LHAASO project, will be used spectrum compositions by measuring total light generated air showers shower maximum depth. Two prototype telescopes have been in operation since 2008. pointing accuracy each crucial direction reconstruction primary particles. On other hand...
LHAASO is planning to enhance its sensitivity at energies around 100 GeV by utilize MCP staffed 20” PMT in the Water Cherekove Detector Array. The effective area for gamma ray detection will reach 1800 m 2 and differential 0.2 CU 50 GeV. It be very useful survey transient phenomena northern sky. expected play an important role multimessenger observation with upgrading.