A5026831308- Advanced NMR Techniques and Applications
- Physics of Superconductivity and Magnetism
- Quantum and electron transport phenomena
- Magnetic properties of thin films
- Atomic and Subatomic Physics Research
- Advanced Condensed Matter Physics
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Solid-state spectroscopy and crystallography
- NMR spectroscopy and applications
- Theoretical and Computational Physics
- Magnetic Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Quantum Computing Algorithms and Architecture
- Rare-earth and actinide compounds
- Organic and Molecular Conductors Research
- Magnetism in coordination complexes
- Advanced MRI Techniques and Applications
- Quantum Information and Cryptography
- Advancements in Battery Materials
- Superconducting Materials and Applications
- Nuclear physics research studies
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Molecular spectroscopy and chirality
National Institute for Materials Science
2013-2024
Tohoku University
2005-2023
Kyushu Institute of Technology
2018
Japan Meteorological Agency
2012-2013
Canon (Japan)
2013
Japan Science and Technology Agency
2002-2011
Kyoto University Institute for Chemical Research
2010-2011
Kyoto Bunkyo University
2010-2011
Kyoto University
2010-2011
National Institute of Technology, Kochi College
1993-2009
The KamLAND-Zen experiment has provided stringent constraints on the neutrinoless double-beta (0νββ) decay half-life in ^{136}Xe using a xenon-loaded liquid scintillator. We report an improved search upgraded detector with almost double amount of xenon and ultralow radioactivity container, corresponding to exposure 970 kg yr ^{136}Xe. These new data provide valuable insight into backgrounds, especially from cosmic muon spallation xenon, have required use novel background rejection...
The chemical order and disorder of solids have a decisive influence on the material properties. There are numerous materials exhibiting order/disorder atoms with similar X-ray atomic scattering factors neutron lengths. It is difficult to investigate such hidden in data obtained from conventional diffraction methods. Herein, we quantitatively determined Mo/Nb high ion conductor Ba7Nb4MoO20 by technique combining resonant diffraction, solid-state nuclear magnetic resonance (NMR)...
Light-element-based fluorescent materials, colloidal graphene quantum dots, and carbon dots (CDs) have sparked an immense amount of scientific interest in the past decade. However, a significant challenge practical applications has emerged concerning development solid-state fluorescence (SSF) materials. This study addresses this knowledge gap by exploring unexplored photonic facets C-based microphotonic emitters. The proposed synthesis approach focuses on carbonized polymer microspheres...
Abstract Colloidal carbon dots (CDs) have garnered much attention as metal‐free photoluminescent nanomaterials, yet creation of solid‐state fluorescent (SSF) materials emitting in the deep red (DR) to near‐infrared (NIR) range poses a significant challenge with practical implications. To address this and engineer photonic functionalities, micro‐resonator architecture is developed using carbonized polymer microspheres (CPMs), evolved from conventional colloidal nanodots. Gram‐scale production...
We succeeded in upgrading the 920-MHz nuclear magnetic resonance (NMR) superconducting magnet (21.6 T) to 1020 MHz (24.0 by replacing innermost Nb3Sn coil with a (Bi,Pb)2Sr2Ca2Cu3O10 (Bi-2223) coil. The NMR spectrometer had been installed National Institute for Materials Science, Tsukuba, Japan, 2001. It has operated persistent mode six years. project started 2006. A Bi-2223 was developed as instead of one. newly is connected and NbTi coils series. upgraded seriously damaged Great East Japan...
We report a measurement of the strange axial coupling constant ${g}_{A}^{s}$ using atmospheric neutrino data at KamLAND. This is component form factor neutral-current quasielastic (NCQE) interaction. The value significantly changes ratio proton and neutron NCQE cross sections. KamLAND suitable for measuring interactions as it can detect nucleon recoils with low-energy thresholds measure multiplicity high efficiency. data, including information on associated interactions, makes possible to...
81Br Nuclear quadrupole resonance (NQR) measurement was performed in an S = 1/2 one-dimensional Heisenberg antiferromagnetic metal complex [NiBr(chxn)2]Br2 (chxn: 1R,2R-diaminocyclohexane), having a halogen-bridged MX chain structure −Br−Ni3+−Br−Ni3+−Br−. Two NQR signals were observed below 40 K, while single signal above 130 showing the presence of two nonequivalent bridging Br sites K. This result together with previously reported magnetic susceptibility and X-ray results indicate...
single‐crystal particles were obtained by supercritical water synthesis (SCWS) under optimized preparation conditions. The reaction time was less than . particle size , which much smaller that of prepared a solid‐state reaction, and the crystal shape rhombohedral. An electron diffraction image showed highly crystalline phase. Intercalation deintercalation lithium into from carried out with good reversibility. ©2000 Electrochemical Society
Evidence for the quasi one-dimensional (1D) antiferromagnetism of CuO is presented in a framework Heisenberg model. We have obtained an experimental absolute value paramagnetic spin susceptibility by subtracting orbital separately from total through $^{63}$Cu NMR shift measurement, and compared directly with theoretical predictions. The result best described 1D $S=1/2$ antiferromagnetic (AFH) model, supporting speculation invoked earlier authors. also present semi-quantitative reason why...
Multicolor emissions from carbon dots (CDs) are vital for light-emitting diodes (LEDs), particularly direct, white-light emission (WLE), which enables a replacement of rare earth (RE)-doped phosphors. However, the difficulty synthesizing single-component WLE CDs with full-spectrum severely hinders further investigation their mechanisms and practical applications. Here, we demonstrate rational design synthesis chromatically tunable cyan-, orange-, emission, precisely along blackbody Planckian...
Cosmic-ray muons produce various radioisotopes when passing through material. These spallation products can be backgrounds for rare event searches such as in solar neutrino, double-$\ensuremath{\beta}$ decay, and dark matter search experiments. The KamLAND-Zen experiment neutrinoless decay 745 kg of xenon dissolved liquid scintillator. includes dead-time-free electronics with a high efficiency detecting muon-induced neutrons. production yields different are measured combination delayed...
Potential influence of a midlatitude SST frontal zone on the zonally symmetric variability in extratropical atmosphere is assessed through idealized aqua-planet experiments with general circulation model. In one experiment gradient as sharp that observed Southwestern Indian Ocean, annular mode well reproduced model summer hemisphere. As actually Southern Hemisphere, represents north-south seesaw westerly wind speed around climatological joint axes jet and storm track, intensified (weakened)...
We describe attempts to achieve high throughput of 17beta-estradiol (E2) analysis, including the development an immunocleanup membrane using polyclonal antibodies and enzyme-linked immunosorbent assay (ELISA) monoclonal antibodies. An epoxy-group-containing monomer, glycidyl methacrylate (GMA), was graft-polymerized onto a porous hollow-fiber membrane. Subsequently, anti-estrogen (ES) antibody, as ligand, coupled with epoxy group. The ligand density ranged from 3.1 5.8 mg/g GMA-grafted A 1.0...
Abstract A new bromo‐bridged Ni III compound has been synthesized. This displayed a strong antiferromagnetic interaction between spins located on species ( J =(2350±500) K) that result from the covalency of NiBr bond and spin‐Peierls transition below 150 K. was shown by results magnetic susceptibility 81 Br nuclear quadrupole resonance spectroscopy analysis. We succeeded in electrostatic carrier doping single crystalline sample using field‐effect transistor device. also showed n‐type...
Co/Cu superlattices were prepared by changing the Ar acceleration voltage ( V B ) in ion beam sputtering. dependence on nanostructure of interface alloy regions has been deduced from 59 Co nuclear magnetic resonance (NMR) spin-echo spectrum, and correlation between magnetoresistance (MR) ratio structure was investigated. The results have shown that there is a interlayer interaction chemical structure. average fractions are nearly uniform equal to 50 at.% for having small Δρ , distributed...
The optical pumping nuclear-magnetic-resonance effect in the compensated semiconductor InP:Fe has been investigated terms of dependences photon energy ${E}_{p},$ helicity ${\ensuremath{\sigma}}^{\ifmmode\pm\else\textpm\fi{}},$ and exposure time ${\ensuremath{\tau}}_{L}$ infrared lights. ${}^{31}\mathrm{P}$ ${}^{115}\mathrm{In}$ signal enhancements show large ${\ensuremath{\sigma}}^{\ifmmode\pm\else\textpm\fi{}}$ asymmetries anomalous oscillations as a function ${E}_{p}.$ We find that (i)...
We report a \^{23}Na and \^{27}Al nuclear magnetic resonance (NMR) investigation of low-silica X (LSX) zeolite with chemical formula Na_{12}Al_{12}Si_{12}O_{48} (Na_{12}-LSX) loaded n additional guest sodium atoms. Na_{n}/Na_{12}-LSX exhibits an insulator-to-metal transition around n=11.6, which is accompanied by significant enhancement bulk susceptibility. Paramagnetic moments are thermally activated in the metallic Na_{12}/Na_{12}-LSX activation energy 0.1 eV. At same time, new shifted...
The spatially oscillating electron spin polarization in Cu layers of [Ni/Cu] superlattice has been investigated by the nuclear magnetic resonance method. damping exponent oscillation deduced from line widths NMR spectra shown an unexpected value “-1”. This fact reflects a topology Fermi surface layers. Moreover, have noticeable anisotropy; spectral shape depends on angle between external field and sample surfaces. From analyses anisotropy, we concluded that anisotropy originates change not...