Qingbiao Wu
A5005520492- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Radiation Therapy and Dosimetry
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Graphite, nuclear technology, radiation studies
- Nuclear Materials and Properties
- Radiation Effects in Electronics
- Environmental and Agricultural Sciences
- X-ray Spectroscopy and Fluorescence Analysis
- Enzyme Production and Characterization
- Magnetic confinement fusion research
- Fusion materials and technologies
- Carbohydrate Chemistry and Synthesis
- Insect-Plant Interactions and Control
- Environmental Changes in China
- Heavy metals in environment
- Pulsed Power Technology Applications
- Plant Parasitism and Resistance
- Enzyme Catalysis and Immobilization
- Cryospheric studies and observations
Institute of High Energy Physics
2009-2023
China Spallation Neutron Source
2016-2023
Chinese Academy of Sciences
2009-2023
Guangxi University
2007-2022
Institute of Modern Physics
2021
Xi'an Jiaotong University
2020
Research Center for Eco-Environmental Sciences
2009
Back-streaming neutrons through the incoming proton channel at spallation target station of China Spallation Neutron Source (CSNS) has been exploited as a white neutron beam line (so-called Back-n), and number spectrometers for nuclear data measurements have planned. With thick tungsten modest moderation by cooling water slices, is very intense which in order 5.0×106 n/cm2/s 80 m from an excellent energy spectrum spanning 1 eV to 100 MeV. In addition, time structure primary under different...
Abstract A close relationship exists between soil organic carbon (SOC) and reactive iron; however, little is known about the role of iron in SOC preservation permafrost regions. We determined amount associated with phases (OC‐Fe) regions Qinghai‐Tibetan Plateau (QTP). The results showed that percentage OC‐Fe ranged 0.9% 59.5% upper 30 cm represented 19.5 ± 12.3% total pool. No clear vertical distribution pattern was present 1 m soil. Throughout year, accounted for relatively stable...
The Back-n white neutron source at China Spallation Neutron Source (CSNS) is designed specifically for nuclear data measurements and multidisciplinary applications. time of flight (TOF) method deployed to obtain a high resolution energy. In the normal operation mode CSNS there are two proton bunches with interval 410 ns in each pulse which has repetition frequency 25 Hz. Due superposition event distributions corresponding bunches, TOF measurement will be degraded by double-bunch...
Abstract The 6 Li( n , t ) 4 He reaction was measured as the first experiment involving neutron-induced charged particle emission reactions at CSNS (China Spallation Neutron Source) Back-n white neutron source. differential cross-sections of 15 detection angles ranging from 19.2° to 160.8° are obtained 1.0 eV 3.0 MeV 80 energy points; for 50 points below 0.1 they reported time. results indicate that anisotropy emitted tritium is noticeable above E = 100 eV. angle-integrated also obtained....
Back-n is a white neutron experimental facility at China Spallation Neutron Source (CSNS). The time structure of the primary proton beam make it fully applicable to use TOF (time-of-flight) method for energy measuring. We implement electronics measurement on general-purpose readout designed all seven detectors in Back-n. based PXIe (Peripheral Component Interconnect Express eXtensions Instrumentation) platform, which composed FDM (Field Digitizer Modules), TCM (Trigger and Clock Module), SCM...
Differential and angle-integrated cross sections for the $^{10}$B($n, α$)$^{7}$Li, α$$_{0}$)$^{7}$Li α$$_{1}$)$^{7}$Li$^{*}$ reactions have been measured at CSNS Back-n white neutron source. Two enriched (90%) $^{10}$B samples 5.0 cm in diameter ~85.0 $μ$g/cm$^{2}$ thickness each with an aluminum backing were prepared, back-to-back mounted sample holder. The charged particles detected using silicon-detector array of Light-charged Particle Detector Array (LPDA) system. energy E$_{n}$ was...
The measurement of 6Li(n, t)4He differential cross section is the first experiment conducted with Light-charged Particle Detector Array (LPDA) at Back-n white neutron source China Spallation Neutron Source. LPDA system consists three kinds detectors. One them grid ionization chamber (GIC), which has capability particle identification. identification performance GIC presented based on data collected in this experiment. Signals from anode and cathode are digitized through readout electronics...
China Spallation Neutron Source (CSNS) is the first High Energy Intense Proton Accelerator planned to be constructed in during State Eleventh Five-Year Plan period, whose induced radioactivity very important for occupational disease hazard assessment and environmental impact assessment. Adopting FLUKA code, authors have a cylinder-tunnel geometric model line-source sampling physical model, deduced proper formulas calculate air activation, analyzed various issues with regard activation of...
A new measurement of the neutron-induced fission cross section $^{236}\mathrm{U}$ relative to standard $^{235}\mathrm{U}(n,f)$ from 0.4--40 MeV was carried out by time-of-flight method and a multicell fast ionization chamber at China Spallation Neutron Source-Back-n white neutron source. The measured resonance peaks distribution event-energy spectrum reaction are in good agreement with that ENDF/B-VIII.0 evaluation, which confirms reliability experimental setup....
The back-streaming neutron beam line (Back-n) was built in the beginning of 2018, which is part China Spallation Neutron Source (CSNS). Back-n first white China, and its main application for nuclear data measurement. For most neutron-induced reaction measurements based on facilities, gamma rays accompanied with one important experimental backgrounds. back streaming transported directly from spallation target to station without any moderator or shielding, flux in-beam much larger than those...
The activation method of metallic foils is an important technique to measure the flux and energy proton beams. In this paper, was used CSNS APEP at seven nominal energies ranging from 10 MeV 70 for beam spot sizes 20 mm × 50 mm. reactions natTi(p, x)48V, natNi(p, x)57Ni, natCu(p, x)58Co, 27Al(p, x)24Na were employed with a range 107-109 p/cm2/s. Furthermore, we also proposed using activity ratio stacked-foil target determine spread Gaussian-like distribution different energies. optimal...