A5072388358- Muon and positron interactions and applications
- Radioactive contamination and transfer
- Nuclear and radioactivity studies
- Radioactivity and Radon Measurements
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Detection and Scintillator Technologies
- Rheology and Fluid Dynamics Studies
- Polymer Nanocomposites and Properties
- Radioactive element chemistry and processing
- Graphite, nuclear technology, radiation studies
- Particle accelerators and beam dynamics
- Polymer crystallization and properties
- Atomic and Molecular Physics
- Rare-earth and actinide compounds
- Electron and X-Ray Spectroscopy Techniques
- Nuclear reactor physics and engineering
- Advancements in Battery Materials
- Neutrino Physics Research
- Iron-based superconductors research
- Polymer Science and PVC
- Astro and Planetary Science
- Medical Imaging Techniques and Applications
- Physics of Superconductivity and Magnetism
Hiroshima University
2025
Osaka University
2015-2024
University of Technology Malaysia
2018-2023
Graduate School USA
2014-2018
Toneyama National Hospital
2016
Fermi National Accelerator Laboratory
2015
Japan Atomic Energy Agency
2010-2012
Advanced Science Research Center
2010-2012
Japan Proton Accelerator Research Complex
2010-2012
Yokohama Rubber (Japan)
1970-1989
Samples of the carbonaceous asteroid Ryugu were brought to Earth by Hayabusa2 spacecraft. We analyzed 17 samples measuring 1 8 millimeters. Carbon dioxide-bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu's parent formed in outer Solar System. The contain low abundances materials at high temperatures, such as chondrules and calcium- aluminum-rich inclusions. rich phyllosilicates carbonates, which through aqueous alteration reactions temperature, pH,...
The recent development of the intense pulsed muon source at J-PARC MUSE, Japan Proton Accelerator Research Complex/MUon Science Establishment (106 s−1 for a momentum 60 MeV/c), enabled us to pioneer new frontier in analytical sciences. Here, we report non-destructive elemental analysis using µ− capture. Controlling from 32.5 57.5 MeV/c, successfully demonstrate depth-profile light elements (B, C, N and O) several mm-thick layered materials bulk analyses meteorites containing organic...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVISCOELASTIC PROPERTIES OF POLYVINYL ACETATES. II. CREEP STUDIES BLENDS1Kazuhiko Ninomiya, John D. Ferry, and Yasuji ŌyanagiCite this: J. Phys. Chem. 1963, 67, 11, 2297–2308Publication Date (Print):November 1, 1963Publication History Published online1 May 2002Published inissue 1 November 1963https://pubs.acs.org/doi/10.1021/j100805a012https://doi.org/10.1021/j100805a012research-articleACS PublicationsRequest reuse permissionsArticle...
Abstract An expression is obtained in the form of an integral equation Fredholm type which correlates mechanical relaxation distribution a linear amorphous polymer with its molecular weight distribution. A method approximate solution this given on basis assumptions that: ( 1 ) spectrum monodisperse sample rubbery region approximated by box‐shaped function; 2 steady‐flow viscosity increases 3.4 power above certain critical M̄ c ; and 3 modulus (or real part complex dynamic elasticity), Ē,...
A large quantity of radionuclides was released by the Fukushima Daiichi Nuclear Power Plant accident in March 2011, and those deposited on ground vegetation could return to atmosphere through resuspension processes. Although has been proposed occur with wind blow, biomass burning, ecosystem activities, etc., dominant process contaminated areas is not fully understood. We have examined radiocesium (134,137Cs) based long-term measurements atmospheric concentration activity (the concentration)...
We report zero-field µ + SR measurements made at J-PARC on CeRu 2 Al 10 . Below the phase transition temperature T 0 ∼27 K, a clear modulation of polarization due to an internal field is observed, indicating that magnetic ordering takes place. Compared with expected from effective moment in disordered state, observed site quite small. This indicates ordered Ce small (∼10 -2 B ) and/or nearest pair moments are mutually anti-parallel. The -dependence somewhat peculiar, suggesting another...
Elemental analysis of materials is fundamentally important to science and technology. Many elemental methods have been developed, but three-dimensional nondestructive bulk has remained elusive. Recently, our project team, dreamX (damageless regioselective with muonic X-rays), developed a depth-profiling method after decade research. This new utilizes type probe; negative muon particle high-energy X-rays emitted the stops in material. We performed depth profiling on an old Japanese gold coin...
Abstract We observed the atmospheric resuspension of radiocaesium, derived from Fukushima Dai-ichi Nuclear Power Plant accident, at Namie, a heavily contaminated area Fukushima, since 2012. During survey periods 2012 to 2015, activity concentrations radiocaesium in air ranged approximately 10 −5 −2 Bq per m 3 and were higher warm season than cold season. Electron microscopy showed that particles collected on filters summer predominantly biological origin (bioaerosols), with which...
Metallic Li deposited on the anode is known to induce short circuiting and degradation of charge capacity Li-ion batteries. However, no reliable technique currently available observe such metal without removing case battery. An elemental analysis using muonic X-rays proposed here because its unique properties nondestructive measurement, high sensitivity light elements, depth resolution. We demonstrated that this can be applied detection surface an containing ions, a fully charged with due...
A knob bow fibula (Bügelknopffibel) of the Leutkirch type, which typologically belongs to second half 4th and early 5th century CE, was excavated in 2018 Roman city Augusta Raurica, present-day Kaiseraugst (AG, Switzerland). This analyzed for first time its elemental composition by using non-destructive technique Muon Induced X-ray Emission (MIXE) continuous muon beam facility at Paul Scherrer Institute (PSI). In present work, detection limit is 0.4 wt% with ∼ 1.5 hours measurement time. The...
Abstract Quantitative elemental analysis method of a bulk material by examining the relation between intensity muonic X-rays and composition was developed. Using this new calibration method, we demonstrated quantitatively determination inside an ancient Chinese coin without sample destruction.
Abstract Viscoelastic properties of four linear and three very lightly crosslinked polybutadienes (microstructure about 50% trans ) were studied. Of the latter, two had not reached gel point, their molecular weight distributions determined by sedimentation velocity analysis; third was just past with only 32% fraction present. The crosslinking agent sulfur. Complex shear compliances measured over a frequency range from 0.1 to 1000 cps at temperatures −70 30°C. Fitzgerald transducer Plazek...
Ordinary muon capture (OMC) on enriched $^{100}\mathrm{Mo}$ isotopes was studied for the first time to investigate neutrino nuclear responses neutrinoless double-$\ensuremath{\beta}$ decays and supernova interactions. Muon proceeds mainly as $^{100}\mathrm{Mo}(\ensuremath{\mu},xn)^{100\ensuremath{-}x}\mathrm{Nb}$ with $x$ being number of neutrons emitted from negative capture. The Nb isotope mass distribution obtained by measuring delayed $\ensuremath{\gamma}$ rays radioactive...
To test bound-state quantum electrodynamics (BSQED) in the strong-field regime, we have performed high precision x-ray spectroscopy of $5g--4f$ and $5f--\text{ }4d$ transitions (BSQED contribution 2.4 5.2 eV, respectively) muonic neon atoms low-pressure gas phase without bound electrons. Muonic been recently proposed as an alternative to few-electron high-$Z$ ions for BSQED tests by focusing on circular Rydberg states where nuclear contributions are negligibly small. We determined...
A search for artefacts made of meteoritic iron has been performed in archaeological collections the greater area Lake Biel, Switzerland. single object identified, an arrowhead with a mass 2.9 g found 19th Century late Bronze Age (900–800 BCE) lake dwelling Mörigen, The origin is definitely proven by combining methods extended and newly applied to artefact. Elemental composition (7.10–8.28 wt% Ni, 0.58–0.86 Co, ∼300 ppm Ge), primary mineralogy consisting associated Ni-poor Ni-rich phases...
Abstract Samples from asteroid Ryugu, brought back by explorer Hayabusa2, are important for investigating the origin and evolution of solar system. Here, we report elemental compositions a 123‐mg Ryugu sample determined with nondestructive muon analysis method. This method is powerful tool determining bulk chemical composition, including light elements such as C, N, O. From muonic x‐ray spectra three carbonaceous chondrites, relationship between composition intensity was each element....