A5023026730- Pulsars and Gravitational Waves Research
- Geophysics and Sensor Technology
- Radiation Detection and Scintillator Technologies
- Advanced Frequency and Time Standards
- Nuclear Physics and Applications
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Superconducting and THz Device Technology
- Superconducting Materials and Applications
- Advanced Thermodynamic Systems and Engines
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Particle Detector Development and Performance
- Physics of Superconductivity and Magnetism
- Astrophysical Phenomena and Observations
- Particle Accelerators and Free-Electron Lasers
- Adaptive optics and wavefront sensing
- Spacecraft and Cryogenic Technologies
- Gamma-ray bursts and supernovae
- Particle accelerators and beam dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Cosmology and Gravitation Theories
- High-pressure geophysics and materials
- Atomic and Subatomic Physics Research
- Radiation Therapy and Dosimetry
Fuji Electric (Japan)
1985-2024
National Astronomical Observatory of Japan
2002-2024
Nihon University
1997-2023
Institute of Space and Astronautical Science
2008-2022
The University of Tokyo
2010-2022
Kavli Institute for the Physics and Mathematics of the Universe
2018-2022
Japan Aerospace Exploration Agency
2008-2022
Nagoya University
2009-2021
Niigata University
2004-2021
Laboratoire de Physique des 2 Infinis Irène Joliot-Curie
2020
TAMA300, an interferometric gravitational-wave detector with 300-m baseline length, has been developed and operated sufficient sensitivity to detect events within our galaxy stability for observations; the interferometer was over 10 hours stably continuously. With a strain-equivalent noise level of $h\ensuremath{\sim}5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}21}/\sqrt{\mathrm{Hz}}$, signal-to-noise ratio 30 is expected gravitational waves generated by coalescence...
Abstract Measurements in the infrared wavelength domain allow direct assessment of physical state and energy balance cool matter space, enabling detailed study processes that govern formation evolution stars planetary systems galaxies over cosmic time. Previous missions revealed a great deal about obscured Universe, but were hampered by limited sensitivity. SPICA takes next step observational capability combining large 2.5-meter diameter telescope, cooled to below 8 K, with instruments...
A remote radiation imaging system comprising a lightweight Compton camera and multicopter drone was developed to remotely quickly measure radioactive contamination inside the buildings of Fukushima Daiichi Nuclear Power Station (FDNPS). The is used for measuring detailed distributions in narrow areas, which have been difficult gauge with conventional aircraft monitoring using helicopters. measurement outdoor environments coastal areas Fukushima, Japan, performed. succeeded observations dense...
We present here the Large-scale Cryogenic Gravitational wave Telescope (LCGT) project which is aimed to improve sensitivity of existing gravitational projects by ten times. LCGT constructing km-scale detector in Japan succeeding TAMA project, adopts cryogenic mirrors with a higher power laser. are planing build it an underground site Kamioka mine. If its target attained, we will be able catch few events per month.
We performed mid-infrared spectroscopic observations of 18 local dusty elliptical galaxies by using the Infrared Spectrograph (IRS) on board Spitzer. have significantly detected polycyclic aromatic hydrocarbon (PAH) features from 14 out and, thus, found that presence PAHs is not rare but rather common in galaxies. Most these show an unusually weak 7.7 μm emission feature relative to 11.3 and 17 features. A large fraction also exhibit H2 rotational line ionic fine-structure emissions, which...
LiteBIRD [Lite (Light) satellite for the studies of B-mode polarization and Inflation from cosmic background Radiation Detection] is a small to map microwave (CMB) radiation over full sky at large angular scales with unprecedented precision. Cosmological inflation, which leading hypothesis resolve problems in Big Bang theory, predicts that primordial gravitational waves were created during inflationary era. Measurements CMB are known as best probe detect waves. The working group authorized...
We analyzed 6 hours of data from the TAMA300 detector by matched filtering, searching for gravitational waves inspiraling compact binaries. incorporated a two-step hierarchical search strategy in filtering. obtained an upper limit 0.59/hour (C.L.=90%) on event rate inspirals binaries with mass between 0.3M⊙ and 10M⊙ signal-to-noise ratio greater than 7.2. The distance 1.4M⊙(0.5M⊙) which produce 7.2 was estimated to be 6.2 kpc (2.9 kpc) when position source sky inclination angle were...
We have measured the mechanical loss of a dielectric multilayer reflective coating (ion-beam sputtered ${\mathrm{SiO}}_{2}$ and ${\mathrm{Ta}}_{2}{\mathrm{O}}_{5}$) in cooled mirrors. The was nearly independent temperature ($4\text{ }\text{ }\mathrm{K}\ensuremath{\sim}300\text{ }\mathrm{K}$), frequency, optical loss, stress caused by coating, details manufacturing processes. angle $(4\ensuremath{\sim}6)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. independence this implies that...
The edge-on starburst galaxy M82 exhibits complicated distributions of gaseous materials in its halo, which include ionized superwinds driven by nuclear starbursts, neutral entrained the superwinds, and large-scale streamers probably caused a past tidal interaction with M81. We investigate detailed dust grains polycyclic aromatic hydrocarbons (PAHs) around to understand their interplay components. performed mid- (MIR) far-infrared (FIR) observations Infrared Camera Far-Infrared Surveyor on...
Aims. We investigate the properties of hydrocarbon grains in galactic superwind M 82. Methods. With AKARI, we performed near-infrared (2.5 - 4.5 um) spectroscopic observations 34 regions 82 including its northern and southern halos. Results. Many spectra show strong emission at 3.3 um due to polycyclic aromatic hydrocarbons (PAHs) relatively weak features 3.4 3.6 aliphatic hydrocarbons. In particular, clearly detect PAH halo regions, which are located a distance 2 kpc away from center. find...
Hidden photons and axion-like particles are candidates for cold dark matter if they were produced non-thermally in the early universe. We conducted a search both of these bosons using 800 live-days data from XMASS detector with 327 kg liquid xenon fiducial volume. No significant signal was observed, thus we set constraints on α′/α parameter related to kinetic mixing hidden coupling constant gAe mass range 40 120 keV/c2, resulting α′/α<6×10−26 gAe<4×10−13. These limits most stringent over...
For high luminosity in electron-positron linear colliders, it is essential to generate low vertical emittance beams. We report on the smallest achieved single-bunch-mode operation of Accelerator Test Facility, which satisfies requirement x-band collider. The emittances were measured with a laser-wire beam-profile monitor installed damping ring. bunch length and momentum spread beam also recorded under same conditions. rms at intensity 4 pm energy 1.3 GeV, corresponds normalized 1.0x1.0(-8)...
The thermal fluctuation of mirror surfaces is the fundamental limitation for interferometric gravitational wave (GW) detectors. Here, we experimentally demonstrate first time a reduction in mirror's GW detector with sapphire mirrors from Cryogenic Laser Interferometer Observatory at 17 and 18 K. sensitivity, which was limited by room temperature, improved frequency range 90 to 240 Hz cooling mirrors. sensitivity reached maximum 2.2×10(-19) m/√Hz 165 Hz.
We report the experimental evidence of ac Josephson effect in a transition edge sensor (TES) operating frequency domain multiplexer and biased by voltage at MHz frequencies. The is observed measuring non-linear impedance sensor. TES treated as weakly linked superconducting system within resistively shunted junction model framework. provide full theoretical explanation results finding analytic solution non-inertial Langevian equation calculating response detector to large bias current presence noise.
SRON is developing ultra-low noise Transition Edge Sensors (TESs) based on a superconducting Ti/Au bilayer suspended SiN island with legs for the SAFARI instrument aboard SPICA mission. We successfully fabricated TESs very narrow (0.5-0.7 μm) and thin (0.25 different sizes of islands using deep reactiveion etching process. The pixel size 840x840 μm<sup>2</sup> there are variety designs without optical absorbers. For absorbers, we measured electrical NEPs as low <1x10<sup>-19</sup>...
High-resolution pionic atom X-ray spectroscopy was performed with an spectrometer based on a 240 pixel array of superconducting transition-edge sensor (TES) microcalorimeters at the πM1 beam line Paul Scherrer Institute. X-rays emitted by carbon via 4f→3d transition and parallel 4d→3p were observed full width half maximum energy resolution 6.8 eV 6.4 keV. The measured energies are consistent calculated electromagnetic values which considered strong interaction effect assessed Seki–Masutani...