A5086658142- Atomic and Molecular Physics
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Magnetic confinement fusion research
- Laser-induced spectroscopy and plasma
- Atomic and Subatomic Physics Research
- Mosquito-borne diseases and control
- Cold Atom Physics and Bose-Einstein Condensates
- Radiation Detection and Scintillator Technologies
- Coleoptera Taxonomy and Distribution
- Laser Design and Applications
- Superconducting Materials and Applications
- Forest Insect Ecology and Management
- Ionosphere and magnetosphere dynamics
- Advanced Frequency and Time Standards
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Laser-Plasma Interactions and Diagnostics
- Dengue and Mosquito Control Research
- Lepidoptera: Biology and Taxonomy
- Particle Detector Development and Performance
- Plasma Diagnostics and Applications
- Radiation Therapy and Dosimetry
- Mass Spectrometry Techniques and Applications
- Carbon Dioxide Capture Technologies
Waseda University
2023-2025
Tohoku University
2016-2022
Kawasaki Heavy Industries (Japan)
2002-2022
Japan Radioisotope Association
2016-2022
Paul Scherrer Institute
2022
The University of Tokyo
2010-2021
University of Hyogo
2020
Ohu University
2018
Tokyo University of the Arts
2010-2017
RIKEN
2015-2017
We report here the first successful synthesis of cold antihydrogen atoms employing a cusp trap, which consists superconducting anti-Helmholtz coil and stack multiple ring electrodes. This success opens new path to make stringent test CPT symmetry via high precision microwave spectroscopy ground-state hyperfine transitions atoms.
Gold nanoparticles (AuNPs) have recently attracted considerable attention as promising drug carriers. In vivo imaging of AuNPs is required to investigate their pharmacokinetics. However, a direct and highly sensitive method has not yet been established. Therefore, we proposed the activation that radioactivates non-invasively visualizes them using emitted gamma rays. When stable isotope gold, 197Au, irradiated with low-energy neutrons, it changes radioactive 198Au, which predominantly emits...
A hydrogen-like atom consisting of a positive muon and an electron is known as muonium. It near-ideal two-body system for precision test bound-state theory fundamental symmetries. The MuSEUM collaboration performed new measurement the muonium ground-state hyperfine structure at J-PARC using high-intensity pulsed beam high-rate capable positron counter. resonance transition was successfully observed near-zero magnetic field, interval $ν_{\text{HFS}}$ = 4.463302(4) GHz obtained with relative...
As a new method to determine the resonance frequency, Rabi-oscillation spectroscopy has been developed. In contrast conventional which draws curve, fits time evolution of Rabi oscillation. By selecting optimized it is shown that precision twice as good with frequency sweep. Furthermore, data under different conditions can be treated in unified manner, allowing more efficient measurements for systems consisting limited number short-lived particles produced by accelerators such muons. We have...
While the international nEDM collaboration at Paul Scherrer Institut (PSI) took data in 2017 that covered a considerable fraction of parameter space claimed potential signals hypothetical neutron (n) to mirror-neutron (n′) transitions, it could not test all signal regions various mirror magnetic fields. Therefore, new study n−n′ oscillations using stored ultracold neutrons (UCNs) is underway PSI, considerably expanding reach fields (B′) and oscillation time constants (τnn′). The apparatus...
The ASACUSA collaboration developed an ultraslow antiproton beam source, monoenergetic source for high-precision investigation (MUSASHI), consisting of electromagnetic trap with a liquid He free superconducting solenoid and low energy transport line. MUSASHI was capable trapping cooling more than $1\ifmmode\times\else\texttimes\fi{}{10}^{7}$ antiprotons extracting them as 150--250 eV.
The MuSEUM collaboration is planning measurements of the ground-state hyperfine structure (HFS) muonium at Japan Proton Accelerator Research Complex (J-PARC), Materials and Life Science Experimental Facility. high-intensity beam that will soon be available H-line allows for more precise by one order magnitude. We plan to conduct two staged measurements. First, we measure Mu-HFS in a near-zero magnetic field, thereafter it strong field. have developed microwave cavities this purpose....
Abstract Objective . Prompt gamma photon, prompt x-ray, and induced positron imaging are possible methods for observing a proton beam’s shape from outside the subject. However, since these three types of images have not been measured simultaneously nor compared using same subject, their advantages disadvantages remain unknown beam shapes in therapy. To clarify points, we developed triple-imaging-modality system to measure photons, x-rays, positrons during irradiation phantom. Approach The...
Waseda University and Tokyo Tech are developing a 50 kg-class small satellite, tentatively named INnovative Space Probe for Imaging R-process Emission (INSPIRE), which is scheduled launch in 2027. The primary detector of the satellite BOX-type Compton Camera (CC-Box) that enables to observe low energy gamma rays (30 keV−200 keV) pinhole mode high (150 keV−3 MeV) mode. CC-Box consists pixelized Ce:GAGG scintillator array using depth-of-interaction (DOI) structure, optically coupled an MPPC...
Muonic hydrogen is a bound state of proton and negative muon. Its Bohr radius 200 times smaller than that an electronic atom. Therefore, spectroscopy the muonic highly sensitive to finite size effect proton. Recent years, charge was determined by laser Lamb shifts in The experiment significantly results past measurements. This anomaly called "proton puzzle" it has been important unsolved problem subatomic physics. Towards solving puzzle, new measurement ground-state hyperfine splitting...
The pupae of Culex (Oculeomyia) bitaeniorhynchus and Cx. (Sirivanakarnius) boninensis are described their taxonomic characters discussed. Chaetotaxy tables full illustrations for these two species prepared. Oculeomyia is resurrected from synonymy with the subgenus given subgeneric status to include sinensis. A new Sirivanakarnius established boninensis. key pupa mosquitoes Ogasawara-gunto presented.
Hiroyuki A. Torii1 on behalf of MuSEUM Collaboration∗. H. Torii1, M. Aoki2, Y. Fukao3, Higashi1, T. Higuchi1, Iinuma3, Ikedo3, K. Ishida4, Iwasaki4, R. Kadono3, O. Kamigaito4, S. Kanda5, D. Kawall6, N. Kawamura3, Koda3, Kojima3, Kubo7, Matsuda1, Mibe3, Miyake3, Mizutani1, Nagamine4, Nishiyama3, Ogitsu3, Okubo3, Saito3, Sasaki3, Shimomura3, P. Strasser3, Sugano3, Tajima1, Tanaka1,4 Tomono4†, E. Torikai8, Toyoda3, Ueno3, Ueno1, Yamamoto3, and Yoshida3. 1Graduate School Arts Sciences,...
Abstract We propose a method to measure the electron electric dipole moment (eEDM) using ultracold entangled francium (Fr) atoms trapped in an optical lattice, yielding uncertainty below standard quantum limit. Among alkali atoms, Fr offers largest enhancement factor eEDM. With based experiment, sensing states could enable search for eEDM at level 10 −30 e cm. estimate statistical and systematic errors attached proposed measurement scheme on this technique. A successful of exploration new...
The variation of the intensity environmental γ-rays has been studied with a Ge(Li) spectrometer. 12 were selected to be examined and typical characteristics variations obtained for each γ-rays. 214Pb 211Bi which are 222Rn daughter nuclei increases on rainy days severalfold value average in case no precipitation. These observed roughly proportional rainfall rate sequence nuclides thorium series 137Cs is nearly constant within about 3% regardless weather. Its equal statistical fluctuation...