A5035483005- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Quantum optics and atomic interactions
- Atomic and Molecular Physics
- Advanced Frequency and Time Standards
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Ion-surface interactions and analysis
- Nuclear physics research studies
- X-ray Spectroscopy and Fluorescence Analysis
- Mechanical and Optical Resonators
- Advanced NMR Techniques and Applications
- Mass Spectrometry Techniques and Applications
- Laser-induced spectroscopy and plasma
- Muon and positron interactions and applications
- Laser-Matter Interactions and Applications
- Electron and X-Ray Spectroscopy Techniques
- Magnetic properties of thin films
- Particle accelerators and beam dynamics
- Terahertz technology and applications
- Quantum and electron transport phenomena
- Magneto-Optical Properties and Applications
- Radioactive Decay and Measurement Techniques
- Physics of Superconductivity and Magnetism
Tokyo University of Agriculture and Technology
2016-2025
Tokyo University of Science
2017
The University of Tokyo
2004-2015
Tokyo University of the Arts
2004-2015
Alps Electric (Japan)
2009
Hitachi Maxell (Japan)
2008
TRIUMF
2002-2005
Czech Academy of Sciences, Institute of Physics
2004
Osaka University
2002-2003
Kyoto University
1997-2002
Depth-controlled $\ensuremath{\beta}$-NMR can be used to probe the magnetic properties of thin films and interfaces on a nanometer length scale. A 30 keV beam highly spin-polarized $^{8}\mathrm{L}\mathrm{i}^{+}$ ions was slowed down implanted into 50 nm film Ag deposited ${\mathrm{S}\mathrm{r}\mathrm{T}\mathrm{i}\mathrm{O}}_{3}$ substrate. novel high field spectrometer observe two well resolved resonances which are attributed Li occupying substitutional octahedral interstitial sites in...
The estrogen pathway plays an important role in the etiology of human endometrial carcinoma (EC). We examined whether biosynthesis tumor microenvironment promotes cancer. To examine contribution stromal cells to signaling EC, we used reporter stably transfected with response element (ERE) fused destabilized green fluorescent protein (GFP) gene. In this system, cancer from several patients activated ERE a variable extent. GFP expression level increased when testosterone, substrate for...
We report the Autler-Townes doublet demonstrating a novel type of coherent interaction atoms not with photons but periodic crystal field when atom is in flight through at high velocity. It was observed by nonoptical X-VUV (vacuum-ultraviolet) double resonance three-dimensional resonant excitation good coherence. The states strongly coupled VUV region were probed x-ray region. characteristic spectra are well interpreted an analogy dressed concept often adopted for atom-photon interaction.
A laser cooled heavy atom is one of the candidates to search for permanent electric dipole moment (EDM) electron due enhancement mechanism and its long coherence time. The francium (Fr) factory has been constructed perform EDM at Cyclotron Radioisotope Center, Tohoku University. present status Fr production measurement system presented.
The excitation, emission spectra, and decay curves of the intensity thulium atoms implanted in liquid solid helium were observed presence absence an external magnetic field. narrow line (width $\ensuremath{\sim}0.1$ nm) excitation spectrum at 590.60 nm is assigned as a zero-phonon transition from electronic ground state ${4f}^{13}{(}^{2}{F}_{7/2}^{o}{)6s}^{2}$, which indicates that between inner shells weakly perturbed by surrounding atoms. pressure dependence wavelength suggests symmetry...
We have observed resonant coherent excitation (RCE) of H-like ${\mathrm{Ar}}^{17+}$ ions traveling through a $1\text{ }\text{ }\ensuremath{\mu}\mathrm{m}$-thick Si crystal at an energy $391\text{ }\mathrm{MeV}/\mathrm{u}$ in the nonchanneling condition. A three-dimensional periodic array atomic planes induces RCE ions. The high heavy together with thin allow us to observe this new measurements charge-state distribution emerging resonances are much narrower than those planar-channeling due...
We present an experimental demonstration of ingenious technique to control the alignment atomic internal state in x-ray region using a periodic crystal field. The directions ${\mathrm{Ar}}^{16+}$ and ${\mathrm{Fe}}^{24+}$ ions were readily controlled by selecting array planes three-dimensional resonant coherent excitation, probed via anisotropy deexcitation emission. applied this method double resonance experiment, succeeded controlling population specific magnetic substate...
The longitudinal electronic spin relaxation time of Cs atoms optically polarized in superfluid helium (He II, 1.5 K) has been measured with special care to cope a serious decrease the number observation region. This decrease, mainly caused by convection introducing into He II laser sputtering, was significantly reduced using new atom implantation method. Combined careful correction for atoms, we have determined be 2.24(19) s or longer, roughly twice as long that solid He.
The finite value of an electron electric dipole moment (eEDM) provides the direct evidence for violation time reversal symmetry. Fr atoms, whose enhancement factor is 895, trapped by laser cooling and trapping techniques are one strongest candidates measuring eEDM. We constructing a beamline eEDM using laser- cooled atoms at Cyclotron Radioisotope Center. have developed light sources including frequency stabilization system magneto-optical trap atoms. As production requires cyclotron...
We demonstrate frequency offset locking between two laser sources using a waveguide-type electro-optic modulator (EOM) with 10th-order sidebands for magneto-optical trapping of Fr atoms. The error signal was successfully obtained by performing delayed self-homodyne detection the beat repumping and sideband component light. Sweeping trapping-light repumping-light frequencies keeping its difference 46 GHz confirmed over 1 monitoring Doppler absorption profile I₂. This technique enables us to...
Selective production of the doubly excited state in 464 MeV/u He-like Ar${}^{16+}$ ions was accomplished using three-dimensional resonant coherent excitation a thin foil silicon crystal. Through interaction with periodic crystal field, were resonantly sequentially from ground to $1s2p$ (${}^{1}\phantom{\rule{-0.16em}{0ex}}P$) and then $2{p}^{2}$ (${}^{1}\phantom{\rule{-0.16em}{0ex}}D$) way analogous two-color x-ray laser excitation. The fields 10${}^{11}$ V/m projectile's frame are...
We demonstrate the cold emission of ytterbium atomic vapors from oxide irradiated with a simple ultraviolet diode laser. Slow atoms are trapped by magneto-optical trap using dipole-allowed transition at 399 nm. The number is larger than those loaded conventional Zeeman slower. This method will open way for development compact apparatus suited transportable optical clocks and other applications.
At temperatures below 2.1 K, long-lived gaseous Rb atoms in glass cells have been generated with a simple method: irradiating the cells, containing 4He gas and metal, cw laser. The obtained atomic density ( approximately 10(8) cm(-3)) decreases 1/e time constant of about 10 s at 1.85 K. We performed optical pumping measured longitudinal electronic spin relaxation K as well. For processes (such Rb-He collisions) which do not remove from vapor, this is found to be 60+/-15 s.
We have studied the loading of gaseous alkali-metal atoms into glass cells held at about 2 K by light-induced atom desorption (LIAD). In LIAD loading, cell containing dense helium gas and a small amount alkali metal is irradiated with cw laser light. This technique has two unique features to be investigated: are desorbed, even weak irradiation, from walls not covered visibly metal, efficiency much higher below superfluid transition temperature for inside than above this temperature. On basis...
We performed scattering experiments using a rubidium (Rb) atomic beam on paraffin films and measured the angular velocity distributions of scattered atoms. The were prepared in various ways characterized by force microscopy x-ray diffraction. exhibited roughnesses crystal structures. preserved spin polarization all consistent with Knudsen's cosine law. well fitted Maxwell's distribution, temperature much closer to film than atomic-beam temperature. therefore concluded that translational...