A5013863207- Muon and positron interactions and applications
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Inorganic Fluorides and Related Compounds
- Graphene research and applications
- Ammonia Synthesis and Nitrogen Reduction
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- International Science and Diplomacy
- Particle Accelerators and Free-Electron Lasers
- Inorganic Chemistry and Materials
- Scientific Computing and Data Management
- Neutrino Physics Research
- MXene and MAX Phase Materials
- Quantum Dots Synthesis And Properties
- Carbon and Quantum Dots Applications
- Polymer Nanocomposite Synthesis and Irradiation
- Medical Imaging Techniques and Applications
- Nanoplatforms for cancer theranostics
- Advanced battery technologies research
University of Science and Technology of China
2015-2024
West Valley College
2024
Nanjing Xiaozhuang University
2024
South China Agricultural University
2022
Because the reconstruction of catalysts is generally observed during oxidation reactions, understanding intrinsic structure-related ability electrocatalysts highly desirable but challenging. Herein, a controllable hydrolysis strategy developed to obtain nickel hydroxide with vacancy (VNi) concentrations, as confirmed by advanced spectroscopic characterization. Electrochemical measurements show that can be promoted increase VNi concentration generate true active components, thereby boosting...
Using the newly developed positron annihilation lifetime spectroscopy (PALS) facility with a high count rate up to 3000 cps, in situ PALS experiments were performed for first time on continuous stretching process of polymers quantitatively analyze minute-scale evolution free-volume holes. According stress–strain relationship and results four types polyethylenes different crystallinities, tensile could be divided into distinct stages: elastic, initial nonlinear (until yield point), postyield,...
The quantum effect of light nuclei in materials is usually considered as lattice vibration and zero-point motion from an ab initio perspective. Here we start full-quantized particles take the muon example, considering two-body quantized system electrons within two-component density functional theory, which can calculate related wave functions directly automatically taking into account muon. We first simulate correlation energy pair-correlation function by Monte Carlo, then construct a...
A muon facility—EMuS (Experimental Muon Source)—at China Spallation Neutron Source (CSNS) has been studied since 2007. CSNS, which is designed to deliver a proton beam power of 100 kW at Phase-I, and will serve multidisciplinary research based on neutron scattering techniques, just completed construction, ready open general users from September 2018. As an additional platform EMuS aims provide different beams for multiple applications, among which, magnetism study by μSR techniques core...
Abstract A Muon station for sciEnce, technoLOgy and inDustrY (MELODY) has been listed in the China Spallation Neutron Source upgrade plan, infrastructure construction is scheduled to start by end of 2022. The 1.6 GeV double-pulsed proton bunch will be extracted from Rapid Cycling Synchrotron (RCS) ring a stand-alone target station. One surface muon one decay beamline are designed provide multi-terminals applications. In this report, we describe design MELODY prospect future
Abstract Positron annihilation lifetime (PAL) spectroscopy is a unique method for characterizing atomic-scale defects and ultramicropores in materials. The conventional PAL spectrometer adopts the γ - coincidence principle, its performance, especially counting rate (CCR), can hardly be further increased. Another β + coincidence, has potential to simultaneously improve CCR time resolution (CTR) of spectrometers. However, early spectrometers have not been widely applied due considerable room...
For the proper interpretation of experimental data produced in slow positron beam technique, implantation properties are studied carefully using latest Geant4 code. The simulated backscattering coefficients, profiles, and median depths for mono-energetic positrons with energy range from 1 keV to 50 normally incident on different crystals reported. Compared previous results, our simulation coefficients reasonable agreement, we think that accuracy may be related structures host materials Based...
Abstract The Phase II upgrade project of the China Spallation Neutron Source (CSNS) includes construction a surface muon beam line and spin rotation/relaxation/resonance (μSR) spectrometer, which will be first μSR spectrometer built in China. Here, we report conceptual design including detector arrangement, magnets, sample environment (SE) chamber. Based on parameters (1 Hz, 10 5 μ + /pulse), possesses over 2500 units to maximize counting rate. Three different types magnets can generate zero...
A new muon and pion capture system is proposed for the China Spallation Neutron Source (CSNS), currently under construction. Using about 4\% of pulsed proton beam (1.6 GeV, 4 kW 1 Hz) CSNS to bombard a cylindrical graphite target inside superconducting solenoid, both surface muons pions can be acquired. The acceptance this novel - wrapped up by solenoid larger than normal lines using quadrupoles at one side separated target. production different magnetic fields was calculated Geant4. bending...
A 128-channel positron detection system will be constructed at Experimental Muon Source (EMuS) of China Spallation Neutron (CSNS) to conduct muon spin rotation/relaxation/resonance ( μSR) measurements. Each detector channel consists a scintillator, light guide, and photomultiplier tube (PMT). The long guide is bent an "L" shape propagate optical photons from the scintillator PMT. series Geant4 simulations experiments has been performed optimize collection performance L-bent detector....
A pulsed muon facility (the so‐called EMuS) at the China Spallation Neutron Source (CSNS) has been studied since 2007. It aims for multidisciplinary applications but with a focus on those based spin rotation/relaxation/resonance techniques. As standalone facility, EMuS will take about 5% or 25 kW of total beam power (500 kW) from CSNS‐II accelerator complex. Two schemes have designed: baseline scheme is an inner conical target in graphite and superconducting solenoids capture transport pions...
Mixed valence manganites are potential functional materials due to their unique electromagnetic properties. In this work, half-doped ceramics with the perovskite structure Sm0.5Ca0.5MnO3 polycrystalline samples synthesized by solid-state reaction method in open air at different final sintering temperatures. Structures and particle sizes studied x-ray diffraction scanning electron microscopy, respectively. Positron annihilation spectroscopy density-functional theory calculations used...
EMuS (Experimental Muon Source) as the first muon source in China will be built at Spallation Neutron Source (CSNS). A 128-channel μSR spectrometer prototype is under development for EMuS. As core part of prototype, detection system (detectors and readout electronics) has been constructed. Beam test (at ISIS U.K.) magnetic shielding have carried out to performances this system. In paper, a new method developed capability by using energy spectrum 22Na source. field up least 30 Gauss can...
BaF2-based detectors have been used in many fields requiring fast timing, especially positron annihilation lifetime (PAL) spectroscopy. The performance of a PAL spectrometer is closely correlated with the time response detectors. Therefore, it important to select scintillation excellent resolution. In this work, coincidence resolution H6610 was investigated using digital oscilloscope. has optimized by tuning supply voltages, sampling rate oscilloscope, and fraction constants, achieving...
Abstract A muon beamline scheme is designed for the Phase-I of Experimental Muon Source (EMuS), which a standalone facility by sharing proton beam extracted from Rapid Cycling Synchrotron (RCS) China Spallation Neutron (CSNS). The EMuS has power 20–25 kW and kinetic energy 1.6 GeV with low repetition rate 1.25–2.5 Hz. Different traditional design, sophisticated splitting system using combined spatial time methods been developed beamline. In order to profit graphite target long effective...