A5050010267- Rare-earth and actinide compounds
- Astrophysics and Cosmic Phenomena
- Magnetic Properties of Alloys
- Iron-based superconductors research
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Physics of Superconductivity and Magnetism
- Magnetic properties of thin films
- Particle physics theoretical and experimental studies
- Solar and Space Plasma Dynamics
- Inorganic Chemistry and Materials
- Advanced Condensed Matter Physics
- Magnetic and transport properties of perovskites and related materials
- Semiconductor materials and interfaces
- Cosmology and Gravitation Theories
- Advanced Materials Characterization Techniques
- Surface and Thin Film Phenomena
- Polyoxometalates: Synthesis and Applications
- Transition Metal Oxide Nanomaterials
- Organic and Molecular Conductors Research
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
- Superconducting Materials and Applications
- Solid-state spectroscopy and crystallography
- Radio Astronomy Observations and Technology
Nagoya Institute of Technology
2015-2025
Keio University Shonan Fujisawa
2024
Hiroshima University
1987-2023
Colorado State University
2012
Nara University
1997-2011
Osaka University
1992-2010
Nara University of Education
2003-2009
Tohoku University
2005-2006
Naragakuen University
2003-2005
Rikkyo University
2004
Neutrinos from the decay of $^{8}\mathrm{B}$ in Sun have been observed Kamiokande-II detector. Based on 450 days data time period January 1987 through May 1988; measured flux obtained with ${E}_{e}$\ensuremath{\ge}9.3 MeV is 0.46\ifmmode\pm\else\textpm\fi{}0.13(stat)\ifmmode\pm\else\textpm\fi{}0.08(sys) value predicted by standard solar model. Within experimental errors, agreement corresponding $^{37}\mathrm{Cl}$ radiochemical detector essentially same period.
A data sample of 1040 days from the Kamiokande II detector, consisting subsamples 450 at electron-energy threshold Ee≥9.3 MeV and 590 Ee≥7.5 MeV, yields a clear directional correlation solar-neutrino-induced electron events with respect to Sun measurement differential distribution. These provide unequivocal evidence for production B8 by fusion in Sun. The measured flux solar neutrinos two relative prediction standard model is 0.46±0.05(stat)±0.06(syst). total tested short-term time...
The method of $^{8}\mathrm{B}$ solar-neutrino measurement by means the reaction ${\ensuremath{\nu}}_{e}e\ensuremath{\rightarrow}{\ensuremath{\nu}}_{e}e$ in Kamiokande II detector is described detail. A data sample 1040 live days time period January 1987 through April 1990 yields a clear directional correlation solar-neutrino-induced electron events with respect to Sun and differential energy distribution. measured flux solar neutrinos from subsamples 450 at threshold...
An analysis of the Mikheyev-Smirnov-Wolfenstein effect using 1040 days Kamiokande-II data is reported, which provides constraints on neutrino-oscillation parameters. The measured recoil-electron energy spectrum alone leads to conclusion that adiabatic region, 7.2\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}4}$${\mathrm{sin}}^{2}$2\ensuremath{\theta}6.3\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}3}$,...
Searches for possible day-night and semiannual variations of the $^{8}\mathrm{B}$ solar neutrino flux are reported based on 1040 days Kamiokande-II data. Within statistical error, no such short-time were observed. The limit difference sets a constraint neutrino-oscillation parameters. A region defined by ${\mathrm{sin}}^{2}$2\ensuremath{\theta}>0.02...
Helical magnetic structures and its responses to external fields in Yb(Ni$_x$Cu$_{1-x}$)$_3$Al$_9$, with a chiral crystal structure of the space group $R32$, have been investigated by resonant X-ray diffraction. It is shown that chirality reflected helicity one relationship, indicating there exists an antisymmetric exchange interaction mediated via conduction electrons. When field applied perpendicular helical axis ($c$ axis), second harmonic peak $(0, 0, 2q)$ develops increasing field. The...
The infrared reflectivities of crystalline forsterite (Mg2SiO4) were measured for the temperature range 295–50 K each crystal axis, between wavenumber 5000 and 100 cm−1. reflection spectra show clear dependence temperature; most bands become more intense, sharper their peak positions shift to higher with decreasing temperature. Reflection fitted dispersion formula damped oscillator model dielectric constants parameters in derived. absorption particle are calculated derived that features good...
The thermal conductivities of superconducting Nb and Ta have been measured in the temperature range 0.04-4 K with without presence dissolved H or D. In doped D phonon mean free path exhibits a minimum which occurs at same deuterium-related anomaly has observed specific heat. Phonon scattering caused by addition to is complicated resonant from dislocations produced precipitation $\ensuremath{\beta}$-phase hydride.
We have succeeded in synthesizing a new Yb-based Kondo lattice system, YbNi 3 X 9 ( = Al, Ga). Our study reveals that Al shows typical features of heavy-fermion antiferromagnet with Néel temperature T N 3.4 K. All the properties reflect competition between effect and crystalline electric field (CEF) effect. The moderate state leads to an enhanced Sommerfeld coefficient 100 mJ/(mol·K 2 ), even if ordered antiferromagnetically. On other hand, isostructural gallide Ga is intermediate-valence...
We present a novel structure, called Subspace Forest, designed to provide an efficient approximate nearest neighbor query of subspaces represented as points on Grassmann manifolds. apply this structure action recognition by representing actions spanning sequence thumbnail image tiles extracted from tracked entity. The Forest lifts the concept randomized decision forests classifying vectors subspaces, and employs splitting method that respects underlying manifold geometry. is inherently...
We succeeded in growing a single crystal of Ce 2 CoIn 8 by the flux method. The results specific heat and electrical resistivity measurements indicate that is heavy-fermion superconductor below 0.4 K with an electronic coefficient γ as large 500 mJ/K mol-Ce.
Upward-going muons produced in the surrounding rock by high-energy neutrinos from astronomical objects have been searched for using large underground water Cherenkov detector, Kamiokande. During a total of 1255 days observation, no significant signal was observed direction eight objects. The 90%-confidence-level (-C.L.) upper limits on upward-going muon fluxes with energy greater than 1.7 GeV are 9.9\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}14}$...
The Infrared Space Observatory (ISO) detected several sharp infrared features around young stars, comets, and evolved stars. These were identified as Mg-rich crystalline silicates of forsterite enstatite by comparison with spectra from laboratory data. However, certain emission bands in the observed cannot be because they appear at slightly shorter wavelengths than peaks spectra, where shapes particles are irregular. To solve this problem, we measured grains various (irregular, plate-like no...
We report electrical resistivity, ac magnetic susceptibility, and x-ray absorption spectroscopy measurements of intermediate valence ${\mathrm{YbNi}}_{3}{\mathrm{Ga}}_{9}$ under pressure field. have revealed a characteristic pressure-induced Yb crossover within the temperature-pressure phase diagram, first-order metamagnetic transition is found below ${P}_{c}\ensuremath{\sim}9\text{ }\text{ }\mathrm{GPa}$ where system undergoes antiferromagnetic transition. As possible origin behavior,...
Thermal-conductivity measurements on deformed superconducting samples of Pb and Ta have demonstrated the resonant scattering thermal phonons from dislocations. The results are in good agreement with calculations based elastic-string model localized modes associated
We have synthesized a new Yb-based Kondo-lattice compound YbNi3Al9. This crystallizes in trigonal ErNi3Al9-type structure (space group R32), which the Yb-ion is arranged two-dimensional honey-comb lattice perpendicular to c-axis. report first measurements of electrical resistivity and magnetization for single-crystalline samples The YbNi3Al9 characteristic typical properties heavy-fermion antiferromagnets with Neel temperature TN = 3.4K. transport magnetic exhibit large anisotropy...
Helical magnet YbNi 3 Al 9 is a candidate for chiral in 4f-electron system, because the structure belongs to enantiomorphic space-group R32 with trigonal lattice.We have measured absolute and detailed magnetization of its substituted analogue Yb(Ni 0.94 Cu 0.06 ) using single crystals.We found that both crystals are not racemate.When magnetic field was applied perpendicular helical axis, showed characteristic curve metamagnetic-like transition below ordering temperature.The features very...
We investigate electrical transport properties of micrometer-sized samples the rare-earth-based monoaxial chiral magnetic crystal ${\mathrm{YbNi}}_{3}{\mathrm{Al}}_{9}$ in order to characterize structures. The magnetoresistance (MR) data exhibit discrete changes, supporting formation spin soliton lattice (CSL) ${\mathrm{YbNi}}_{3}{\mathrm{Al}}_{9}$. Reversal and lock-in behavior MR signal are significant features during CSL formation, which contrast with hysteresis reported a prototype...
Abstract The electrical resistivity under hydrostatic pressure up to 1.0 GPa, Hall effect, magnetoresistance, and thermoelectric power are measured over the temperature range from 1.5 300 K for both, orthorhombic γ‐Mo 4 O 11 monoclinic η‐Mo crystals with quasi‐two‐dimensional structures. All these properties show anomalies associated charge density wave (CDW) transition; particularly enhances CDW instabilities through increased electron–phonon interaction partial nesting of Fermi surfaces....