A5022387683- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Radiation Detection and Scintillator Technologies
- High-pressure geophysics and materials
- Advanced NMR Techniques and Applications
- Nuclear reactor physics and engineering
- Non-Destructive Testing Techniques
- Magnetic properties of thin films
- Particle Detector Development and Performance
- Cold Atom Physics and Bose-Einstein Condensates
- Surfactants and Colloidal Systems
- X-ray Diffraction in Crystallography
- Ionic liquids properties and applications
- Theoretical and Computational Physics
- Characterization and Applications of Magnetic Nanoparticles
- Hydrogels: synthesis, properties, applications
- Magnetic Properties and Synthesis of Ferrites
- Iron oxide chemistry and applications
- Fuel Cells and Related Materials
- Advanced Polymer Synthesis and Characterization
- Microstructure and Mechanical Properties of Steels
- Cyclopropane Reaction Mechanisms
- Electrospun Nanofibers in Biomedical Applications
- Magnetic Properties of Alloys
Japan Atomic Energy Agency
2016-2025
Japan Proton Accelerator Research Complex
2015-2024
Advanced Science Research Center
2024
Hokkaido University
2020
Nagoya University
2017-2020
Comprehensive Research Organization for Science and Society
2014-2020
Keio University
2011-2014
Tohoku Medical and Pharmaceutical University
2000
Shohoku College
1995
The energy-resolved neutron imaging system, RADEN, has been installed at the pulsed source in Materials and Life Science Experimental Facility of Japan Proton Accelerator Research Complex. In addition to conventional radiography tomography, world's first beam-line a source, provides three main options for new, quantitative techniques: Bragg-edge visualize spatial distribution crystallographic information, resonance absorption elemental composition temperature polarized magnetic field...
\ensuremath{\gamma}-Fe${}_{2}$O${}_{3}$/SiO${}_{2}$ core-shell nanoparticles with different shell thicknesses were prepared to elucidate the condition for superspin-glass (SSG) dynamics. As thickness decreases, contribution of interparticle dipolar interaction becomes apparent in magnetic dynamics nanoparticle assembly. The frequency dependence peaks ac-magnetic susceptibility samples strong interactions slows down, which is characterized as emergence a spin-glasslike phase. Aging...
The small-angle neutron scattering diffractometer SANS-J at the research reactor JRR-3, Tokai, Japan has been upgraded. A 3 He front detector was installed adjacent to direct beam just behind sample position cover in range 1.3–6 nm −1 for magnitude of vector Q . Additionally, maximum covered by existing main extended 1.8 decreasing minimum sample-to-detector distance. These modifications enabled gapless measurements curve 0.002–6 with three standard device layouts that can be changed within...
Magnetic refrigeration represents an environmentally friendly and promising technology for cooling applications, particularly in hydrogen liquefaction. Recent advancements have demonstrated a highly efficient protocol utilizing small magnetic-field oscillations near metamagnetic transitions, tested using pure holmium metal. This study investigates ternary alloys substituted with erbium cerium, specifically <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:msub><a:mi...
We are developing a neutron polarizer with polarized $^3$He gas, referred to as spin filter, based on the Spin Exchange Optical Pumping (SEOP) for scattering experiments at Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). A gas-filling station was constructed J-PARC, several cells long relaxation times have been fabricated using station. laboratory has prepared in MLF beam hall polarizing cells, compact pumping systems laser powers...
To achieve high-performance proton-exchange membranes (PEMs), understanding of the polymer structure/property relationship is crucial. In particular, structure water clusters (number, size, interdomain distance, interconnectivity, etc.) and hydrophobic domains dominates important membrane properties, such as proton conductivity mechanical strength, which can be adjusted by monomer sequence in chains. present paper, we have prepared three sulfonated polyphenylene-based copolymers (SPP-MP,...
Abstract The design of crosslinking domains is a vital factor to create functional hydrogels with controlled physical, mechanical, and adhesive properties. This paper demonstrates versatile synthetic systems micelle‐crosslinked highly stretchable, self‐healing, selectively For this, methacrylate‐bearing random copolymer micelles are designed as physical covalent crosslink via the self‐assembly amphiphilic copolymers carrying hydrophilic poly(ethylene glycol) (PEG), hydrophobic butyl or...
Cu alloys with high durability and thermal electric conductivities are the key to achieving a more energetically efficient eco-friendly future. Noble Zr-added oxide-dispersion-strengthened (ODS-Cu) strengths promising materials for meeting all future service requirements. In this study, three-dimensional atom probe (3D-AP) transmission electron microscopy (TEM) revealed that majority of nano-oxide particles in ODS-Cu were novel yttria-stabilized zirconia (YSZ) diameter less than 4 nm, which...
In strongly interacting nanoparticle agglomerate through dipolar coupling, prepared using chemically synthesized α-Fe nanoparticle, the temperature Tpeak at which zero-field-cooled magnetization exhibits its peak reaches 385 K. This indicates that magnetic ordering appears above room temperature. Aging phenomena and memory effect observed below are intrinsically same as of spin glasses. The appearance spin-glasslike behavior near should be attributed to three-dimensional interparticle...
The small-angle neutron scattering (SANS) and x-ray (SAXS) measurements were performed for deuterated non-deuterated poly(ethylene glycol) (d-PEG h-PEG, respectively) in D2O a D2O/H2O mixed solvent (Mix) to compare the profiles. To determine coherent intensity of SANS, 3He spin filter was utilized. profiles determined by SANS analyzed terms wormlike chain model with touched beads along contour chain. However, SAXS not explained same uniform but each consisting core shell having different...
Polarized neutron imaging is an attractive method for visualizing magnetic fields in a bulk object or free space. In this technique polarization of neutrons transmitted through sample analyzed position by to produce image the distribution. particular, combination three-dimensional spin analysis and use pulsed beam very effective quantitative evaluation both field strength direction means wavelength dependent vector. Recently new instrument "RADEN" has been constructed at line BL22 Materials...
We have been developing a magnetic field imaging method using polarized pulsed neutrons for quantitative evaluation of fields in industrial equipment. To reduce the power loss these products, it is important to quantitatively evaluate distribution not only strength but also direction internal field. In this study, we attempted visualize directional model electric motor. Because limited wavelength range that could use present analysis, polarization image motor was confirmed reflect outside It...
Amphiphilic random copolymers bearing poly(ethylene glycol) (PEG) and alkyl groups as side chains are intermolecularly self-assembled into size-controlled multichain micelles in water. The copolymer known to induce the exchange of their polymer chains, whereas details kinetics mechanism have not been elucidated yet. Herein, we investigated between by time-resolved small-angle neutron scattering (TR-SANS). For this purpose, carrying PEG deuterated butyl or dodecyl were designed for micelles....
The contrast-variation technique in neutron scattering experiments plays a pivotal role distinguishing partial structures within multi-component complexes, facilitating the elucidation of distinct sample constituents. This differentiation is achieved using different isotopes, namely hydrogen and deuterium, which possess varying characteristics. study presents novel vapor generator designed for experiments, enabling continuous control D 2 O/H O ratio vapor. feature especially useful studies....
We have performed neutron radiography and tomography using a CCD camera-type detector for some test samples at RADEN. The current spatial resolution is estimated to about 350 μm in the largest field-of-view of 300 × mm2 100 60 mm2. It thought that latter strongly affected by image blur scintillator screen. In case tomography, be better than 0.5 mm an iron aluminum sample. Furthermore, we cast product. As result, small blowholes are found center This demonstrates importance non-destructive...
We have developed a polarized 3He neutron spin filter (NSF) for new spectrometer, POLANO, at the Japan Proton Accelerator Research Complex (J-PARC). POLANO aims to utilize high energy neutrons by NSF and analyzed an array of magnetic supermirrors inelastic scattering. The gas is continuously in-situ spin-exchange optical pumping provide highly stably beam. designed polarize with energies as 200 meV fit in restricted space. It equipped adiabatic fast passage NMR that enables one flip spins,...
The reliability of neutron resonance thermometry was discussed based on measurements neutrons transmitted through tantalum (0.1 mm thick) and tungsten (1 indicators at 26, 96, 189, 285 degrees Celsius using the energy-resolved imaging system, RADEN, Japan Proton Accelerator Complex (J-PARC). intensity sides dips were found to decrease with increasing temperature. Sensitivity coefficients convert this temperature derived, two-dimensional distributions decreasing rates, being proportional...
Neutron polarization analysis (NPA) for small-angle neutron scattering (SANS) experiments using a pulsed source was successfully achieved by applying 3 He spin filter as analyzer the neutrons scattered from sample. The cell of gives weak intensity (background) and covers sufficient solid angle performing SANS experiments. relaxation time is continuous use approximately 2 days, thus reaching typical duration required complete set Although accurate evaluation incoherent scattering, which...
Freeze cross-linking increases the mechanical strength of carboxymethyl cellulose nanofiber (CMCF) hydrogels. The structural changes CMCF hydrogels during freeze reaction were investigated. SEM images prepared with different times showed that hydrogel in initial state cross-lining (t ≤ 1 h) has a fibrous structure due to original CMCF. As progressed ≥ 12 h), was no longer present and sheet average thickness 1.5 ± 0.2 µm observed. XRD profiles indicated consisted stable crystalline II, which...