A5103144110- Advanced Frequency and Time Standards
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Advanced Fiber Laser Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Particle Detector Development and Performance
- Atomic and Molecular Physics
- Dark Matter and Cosmic Phenomena
- Ga2O3 and related materials
- Advanced Photocatalysis Techniques
- Scientific Measurement and Uncertainty Evaluation
- Spectroscopy and Laser Applications
- Semiconductor materials and devices
- Nuclear physics research studies
- Radiation Detection and Scintillator Technologies
- Solid State Laser Technologies
- Carbon Nanotubes in Composites
- ZnO doping and properties
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
- Advanced Measurement and Metrology Techniques
- Ultra-Wideband Communications Technology
- Synthesis and Catalytic Reactions
National Institute of Advanced Industrial Science and Technology
2015-2025
Osaka University
2006-2025
Chiba University
2025
National Institute of Standards
2025
National Institute of Standards and Technology
2024-2025
Kyoto University
2020-2024
Tohoku University
2024
Niigata University
2017-2023
Akita University
2022
Materials Science & Engineering
2022
In state-of-the-art optical lattice clocks, beyond-electric-dipole polarizability terms lead to a breakdown of magic wavelength trapping. this Letter, we report novel approach evaluate light shifts, specifically addressing recent discrepancies in the atomic multipolarizability term between experimental techniques and theoretical calculations. We combine imaging multi-ensemble shift coefficients, leveraging comparisons dual-ensemble clock rapidly differential frequency shifts. Further,...
Exotic molecule tests fundamental symmetry Spectroscopy of exotic molecules can offer insight into physics. Hori et al. studied the transition frequencies an unusual helium atom in which one two electrons was substituted by antiproton, negatively charged antiparticle partner proton (see Perspective Ubachs). The antiprotonic cooled down to low temperatures allow be measured with high precision. extracted mass antiproton (relative electron mass) good agreement previous measurements mass. This...
We search for ultralight scalar dark matter candidates that induce oscillations of the fine structure constant, electron and quark masses, quantum chromodynamics energy scale with frequency comparison data between a $^{171}\mathrm{Yb}$ optical lattice clock $^{133}\mathrm{Cs}$ fountain microwave span 298 days an uptime 15.4%. New limits on couplings to electrons gluons in mass range from ${10}^{\ensuremath{-}22}$ ${10}^{\ensuremath{-}20}\text{ }\text{ }\mathrm{eV}/{c}^{2}$ are set, assuming...
We have developed an optical frequency comb using a mode-locked fiber ring laser with intra-cavity waveguide electro-optic modulator controlling the length in cavity. The mode-locking is achieved simple configuration and nonlinear polarization rotation mechanism. beat note between reference carrier envelope offset of were simultaneously phase locked servo bandwidths 1.3 MHz 900 kHz, respectively. observed out-of-loop two identical combs, obtained coherent δ-function peak signal to noise...
Abstract The characteristics of structural defects observed on (100) wafers in β-Ga 2 O 3 single crystals grown by directional solidification a vertical Bridgman furnace were studied terms crystal growth conditions. No high-dislocation-density regions near the wafer periphery owing to lack adhesion between as-grown ingot surface and crucible inner wall, with very low temperature gradient resulted mean dislocation density 2.3 × 10 cm −2 . Line-shaped up 150 µm long [010] direction detected at...
Abstract We report improved absolute frequency measurement of the 1 S 0 - 3 P transition 171 Yb at National Metrology Institute Japan (NMIJ) by comparing optical lattice clock NMIJ-Yb1 with 13 Cs primary standards via International Atomic Time from August 2021 to May 2023. The measured is 518 295 836 590 863.62(10) Hz a fractional uncertainty 1.9 × 10 -16 , in good agreement recommended as secondary representation second. This 2.6 times lower than our previous uncertainty, and slightly any...
Abstract Herein, we report a copper‐catalyzed intramolecular benzylic C( sp 3 )−H oxidation of unprotected aniline derivatives under aerobic conditions, which enables the preparation phenanthridine compounds. To best our knowledge, this is pioneering reaction dehydrogenative )−N bond formation from anilines Cu/O 2 system. Notably, various possessing alkyl, methoxy, halogen (fluoride, chloride, bromide, and iodide), trifluoromethyl, trifluoromethoxy, cyano, ester, acetal groups can also...
We report on the achievement of a reduced time difference in scale with respect to Coordinated Universal Time (UTC) by steering hydrogen-maser-based near-continuously operating optical lattice clock. The is generated postprocessing analysis for 230 days using hydrogen maser its fractional frequency stability limited flicker floor $2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}15}$ and an $\mathrm{Yb}$ clock operated uptime 81.6%. During 230-day period, root-mean-square our UTC 0.52...
We measure the absolute frequency of 12 sub-Doppler lines $P(6)$ and $P(7)$ transitions in ${\ensuremath{\nu}}_{3}$ band ${^{12}\text{C}\text{H}}_{4}$ using difference-frequency-generation (DFG) $1.064\text{\ensuremath{-}}\ensuremath{\mu}\text{m}$ Nd:YAG $1.55\text{\ensuremath{-}}\ensuremath{\mu}\text{m}$ DFB lasers a fiber-based comb referenced to International Atomic Time. The relative uncertainties are typically $9.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$, determined...
The existing data of antinucleon-nucleon and antinucleon-nuclei annihilation cross-sections are confined to energies above about 1MeV. Experimental limitations have prevented till now the lower be achieved in spite interest they represent for theoretical models. One unresolved question concerns antiproton cross-section measured at LEAR on light nuclei MeV region, which show a saturation with mass number target nucleus against any naive expectation. With regard fundamental cosmology,...
We demonstrate a compact iodine-stabilized laser operating at 531 nm using coin-sized light source consisting of 1062-nm distributed-feedback diode and frequency-doubling element. A hyperfine transition molecular iodine is observed the with saturated absorption spectroscopy. The frequency stabilized to achieves stability 10(-12) level. absolute a(1) component R(36)32 - 0 determined as 564074632419(8) kHz relative uncertainty 1.4×10(-11). can be used for various applications including...
We performed an absolute frequency measurement of the $^1S_{0}$-$^3P_{0}$ transition in $^{87}$Sr with a fractional uncertainty $1.2 \times 10^{-15}$, which is less than one third that our previous measurement. A caesium fountain atomic clock was used as transfer oscillator to reduce link between strontium optical lattice and SI second. The value 429 228 004 229 873.56(49) Hz.
We report absolute frequency measurements of 81 hyperfine components the rovibrational transitions molecular iodine at 578 nm using second harmonic generation an 1156-nm external-cavity diode laser and a fiber-based optical comb. The relative uncertainties measured frequencies are typically $1.4\times10^{-11}$. Accurate constants four obtained by fitting splittings to four-term effective Hamiltonian including electric quadrupole, spin-rotation, tensor spin-spin, scalar spin-spin...
The Atomic Spectroscopy and Collisions Using Slow Antiprotons experiment at the Antiproton Decelerator (AD) facility of CERN constructed segmented scintillators to detect track charged pions which emerge from antiproton annihilations in a future superconducting radiofrequency Paul trap for antiprotons. A system 541 cast extruded scintillator bars were arranged 11 detector modules provided spatial resolution 17 mm. Green wavelength-shifting fibers embedded scintillators, read out by silicon...
We report an uncertainty evaluation of $^{171}$Yb optical lattice clock with a total fractional $3.6\times10^{-16}$, which is mainly limited by the lattice-induced light shift and blackbody radiation shift. Our shift, density second-order Zeeman based on interleaved measurement where we measure frequency using alternating stabilization laser to $\mathrm{6s^{2}\,^{1}S_{0}-6s6p\,^{3}P_{0}}$ transition two different experimental parameters. In present evaluation, uncertainties sensitivity...