A5057590515- Radiation Detection and Scintillator Technologies
- Diamond and Carbon-based Materials Research
- Manufacturing Process and Optimization
- Advanced machining processes and optimization
- Nuclear Physics and Applications
- Advanced Surface Polishing Techniques
- Advanced Numerical Analysis Techniques
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Advanced Measurement and Metrology Techniques
- Semiconductor materials and devices
- High-pressure geophysics and materials
- Ion-surface interactions and analysis
- Electronic and Structural Properties of Oxides
- Additive Manufacturing and 3D Printing Technologies
- Radioactivity and Radon Measurements
- Luminescence Properties of Advanced Materials
- Engineering Applied Research
- Additive Manufacturing Materials and Processes
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Magnetic confinement fusion research
- Nuclear materials and radiation effects
- Nuclear Engineering Thermal-Hydraulics
- Metal and Thin Film Mechanics
Saitama University
2016-2025
Hokkaido University
2016-2025
Japan Atomic Energy Agency
1995-2025
Futaba (Japan)
2023
The University of Tokyo
2021
Pakistan Nuclear Regulatory Authority
2020
Dexerials (Japan)
2019
Bridge University
2014
Shibaura Institute of Technology
2010-2011
Tokyo Institute of Technology
2005-2009
Quantum-mechanically coupled well systems consisting of two GaAs wells 30 Å thick separated by an Al0.5Ga0.5As barrier whose thickness was varied from 12 to 40 have been grown metalorganic chemical vapor deposition. The photoluminescence spectra these indicated the splitting a degenerate single state into doublet state, symmetrical and antisymmetric state. location spectrum peak shoulders agreed with calculated energies using Dingle’s connection rule which assumes 85% conduction band offset...
The direct energy deposition arc process is widely used for fabricating medium and large components with moderate geometric complexity but often results in coarse microstructures inconsistent hardness. This study introduces a hybrid manufacturing approach combining the friction stir burnishing by gas–metal welding technique to refine microstructure enhance microhardness of fabricated from austenitic stainless steel 316L. Our former an aluminum alloy (A5052) tool, demonstrating significant...
Growth of cerium-doped gadolinium pyrosilicate single crystals, which show 2.5 times greater light output for gamma-rays and five alpha-particles than GSO is accomplished using the floating zone growth method (FZ method). Although (GPS) crystal considered to be difficult because it melts incongruently according phase diagram system, we attempted Ce:GPS possibility that heavy Ce doping would change diagram. Transparent crystals were obtained, although some cracks observed in crystals. The...
Wire arc additive manufacturing (WAAM), based on gas metal welding, is ideal for fabricating components with sizeable geometries and moderate structural intricacies. However, the electric introduces a heat source directional dissipation during deposition, resulting in undesired microstructural characteristics, such as columnar dendritic structures, which lead to variations hardness across printed component. Our previous research introduced friction stir burnishing (FSB) tool integrated WAAM...
For stable semiconductor detector operation under harsh environments, an ideal single-crystal diamond without a charge trapping centre is required. this study, self-standing CVD was fabricated using lift-off method. The reduction of factors such as structural defects, point and nitrogen impurities, attempted 0.2% low-methane concentration growth full metal seal chamber. A high-quality with strong free-exciton recombination emission obtained. Charge collection efficiencies were 100.1% for...
We fabricated diamond pseudo-vertical Schottky barrier diodes using a half-inch semi-insulative (100) wafer. Most exhibited large rectifying ratio (>1010) with undetectable leakage current at reverse bias of 5 V (0.6 MV cm−1), only 2% exhibiting an Ohmic-like current. Surface defects were observed under the diode, and their impacts on electrical properties analyzed Murphy model correlation factor analysis. found that most crystalline (surface hillocks) electrically non-active...
Two natural diamond detectors (NDDs) operating at room temperature were used for Fusion Neutronics Source (FNS) deuterium–tritium (DT) neutron spectra measurements different points around the tritium target and deuteron beam energies. Energy resolution of both NDDs measured, with values 1.95% 2.8%. Due to higher energy one two studied it was possible measure shape DT distribution its broadening due scattering inside target. The influence pulse pileup on combined system (NDD+electronics)...
Cerium-doped gadolinium pyrosilicate single crystals Ce:Gd <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Si O xmlns:xlink="http://www.w3.org/1999/xlink">7</sub> (Ce:GPS) with various Ce concentrations of 2.5-30 mol% respect to the total rare-earth sites were prepared by floating zone method. Their scintillation performances investigated under irradiation gamma rays <sup xmlns:xlink="http://www.w3.org/1999/xlink">137</sup> Cs. The...
A self-standing single-crystal chemical vapor deposited diamond was obtained using lift-off method. It fabricated into a radiation detector and response function measurements for 14 MeV neutrons were taken at the fusion neutronics source. 1.5% of high energy resolution by (12)C(n, α)(9)Be reaction an angle 100° with deuteron beam line. The intrinsic resolution, excluding spreading caused neutron scattering, slowing in target circuit noises 0.79%, which also best ever reported.
Response function measurement of layered-type chemical vapor deposition single crystal diamond radiation detectors for 14 MeV neutrons was carried out. The detector had a layered structure that composed boron-doped layer 0.5 μm in thickness and nondoped 20 on an inexpensive high pressure temperature-type Ib substrate. energy resolution 2.6% 5.5 α particles. This experiment mainly out order to understand the present status as neutron spectrometer extent charge trapping. As result, peak caused...