A5018148588- Muon and positron interactions and applications
- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Fusion materials and technologies
- Nuclear Materials and Properties
- Diamond and Carbon-based Materials Research
- Metal Forming Simulation Techniques
- Ammonia Synthesis and Nitrogen Reduction
- Metallurgy and Material Forming
- Metal and Thin Film Mechanics
- MXene and MAX Phase Materials
- Advanced ceramic materials synthesis
- Graphene research and applications
- Semiconductor materials and devices
- Ion-surface interactions and analysis
- Engineering Structural Analysis Methods
- Microstructure and mechanical properties
- Advanced Photocatalysis Techniques
- Nuclear Physics and Applications
- Boron and Carbon Nanomaterials Research
- Chemical Synthesis and Characterization
- Ga2O3 and related materials
- Photocathodes and Microchannel Plates
- Fatigue and fracture mechanics
- Plasma Diagnostics and Applications
Joint Institute for Nuclear Research
2014-2024
Institute of Electrophysics
2015
University of Waterloo
2006-2009
Films of α-Ga2O3 grown by Halide Vapor Phase Epitaxy (HVPE) were irradiated with protons at energies 330, 400, and 460 keV fluences 6 × 1015 cm−2 7 MeV C4+ ions a fluence 1.3 1013 characterized suite measurements, including Photoinduced Transient Current Spectroscopy (PICTS), Thermally Stimulated (TSC), Microcathodoluminescence (MCL), Capacitance–frequency (C–f), photocapacitance Admittance (AS), as well Positron Annihilation (PAS). Proton irradiation creates conducting layer near the peak...
Abstract The Low Energy Positron Toroidal Accumulator (LEPTA) at the Joint Institute for Nuclear Research (JINR) proposed generation of positronium in flight has been adopted positron annihilation spectroscopy (PAS). injector generates continuous slow beam with energy range between 50 eV and 35 keV. radioactive 22 Na isotope is used. In distinction to popular tungsten foil, here solid neon used as moderator. It allows obtain intensity about 10 5 e + /s width spectrum characterized by full...
The quantum phase transition has been discovered in a multivalley two-dimensional electron system confined an AlAs well at low temperatures and high magnetic fields. occurred with successive increase the tilt angle of field accompanied by appearance sharp peak longitudinal resistance sample. spin resonance technique made it possible to identify type observed transition, which is extremely difficult determine conventional transport approaches. At same time, component plane directed such way...
Effects of postgrowth high-temperature annealing on vacancy complexes and photoluminescence (PL) from GeSiSn/Si multiple quantum wells (MQWs) are studied. The series PL peaks related to the vacancy-tin was observed for as-grown samples including different structures, such as MQWs, multilayer periodic structure with GeSiSn dots (QDs), GeSn cross-structures upon thick layers. band intensity is significantly reduced after at 700 °C corresponding reduction in density, demonstrated by positron...
Zr/Nb nanoscale multilayer coatings (NMCs) were studied after hydrogenation in a gaseous environment at 400 °C. The hydrogen distribution and content determined by pressure time. Increasing the from 0.2 to 2 MPa resulted different within NMCs, while concentration remained constant 0.0150 ± 0.0015 wt. %. increased 0.0165 0.001 0.0370 % when time was extended 1 7 h. δ-ZrH hydride phase formed Zr layers with crystals reorienting towards [100] direction. Nb(110) diffraction reflex shifted...
The effect of proton irradiation on the structure, phase composition, defect state and nanohardness Zr/Nb nanoscale multilayer coatings was investigated. Preservation layered structure with 50 100 nm thick layers, observed after protons at 1720 keV energy 3.4 × 1015, 8.6 1015 1016 ions/cm2 fluences, interfaces remained incoherent. In individual layer thicknesses 10 25 nm, there were insignificant fluctuations in interplanar distance, which influenced by changes fluence, partially destroyed...
A combined experimental and analytical approach is used to study damage initiation evolution in three-dimensional second phase particle fields. formulation of a percolation model developed predict nucleation propagation through random-clustered The proposed capable capturing the character phenomena three stages ductile fracture, namely, void nucleation, growth, coalescence, at level discrete particles. An situ tensile test with X-ray tomography utilized quantify material during deformation...
Currently, diamonds are widely used in science and technology. However, the properties of due to their defects not fully understood. In addition optical methods, positron annihilation spectroscopy (PAS) can be successfully study diamonds. Positrons capable detecting vacancies, small large clusters vacancies induced by irradiation, providing information about size, concentration, chemical environment. By mapping infrared (IR) range, it is possible consider admixture composition main...