A5050698015- Nuclear Physics and Applications
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Electron and X-Ray Spectroscopy Techniques
- Advanced NMR Techniques and Applications
- Radioactive Decay and Measurement Techniques
- Medical Imaging Techniques and Applications
- Quantum, superfluid, helium dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Electron Microscopy Techniques and Applications
- Machine Learning in Materials Science
- Advanced Materials Characterization Techniques
- Crystallography and Radiation Phenomena
- High-pressure geophysics and materials
- Environmental Chemistry and Analysis
- Surface and Thin Film Phenomena
- Heat Transfer and Boiling Studies
- Advancements in Photolithography Techniques
- Fluid Dynamics and Thin Films
- NMR spectroscopy and applications
- Aerosol Filtration and Electrostatic Precipitation
- Experimental and Theoretical Physics Studies
- Analytical Chemistry and Chromatography
Nagoya University
2017-2025
Toho University
2024
High Energy Accelerator Research Organization
2020
Kyushu University
2017
University of Shiga Prefecture
2013
Osaka Institute of Technology
2007
Saga University
2003
Mitsubishi Electric (Japan)
1990
Tohoku Medical and Pharmaceutical University
1980
The order Chiroptera (bats) is the second largest group of mammals. One essential adaptations that have allowed bats to dominate night skies laryngeal echolocation, where emit ultrasonic pulses and listen returned echo produce high-resolution 'images' their surroundings. There are two possible scenarios for evolutionary origin echolocation in bats: (1) a single common ancestor followed by secondary loss Pteropodidae, or (2) convergent origins Rhinolophoidea Yangochiroptera. Although data...
We are developing a neutron polarizer with polarized $^3$He gas, referred to as spin filter, based on the Spin Exchange Optical Pumping (SEOP) for scattering experiments at Materials and Life Science Experimental Facility (MLF) of Japan Proton Accelerator Research Complex (J-PARC). A gas-filling station was constructed J-PARC, several cells long relaxation times have been fabricated using station. laboratory has prepared in MLF beam hall polarizing cells, compact pumping systems laser powers...
Angular distribution of individual $\gamma$-rays, emitted from a neutron-induced compound nuclear state via radiative capture reaction ${}^{139}$La(n,$\gamma$) has been studied as function incident neutron energy in the epithermal region by using germanium detectors. An asymmetry $A_{\mathrm{LH}}$ was defined $(N_{\mathrm L}-N_{\mathrm H})/(N_{\mathrm L}+N_{\mathrm H})$, where $N_{\mathrm L}$ and H}$ are integrals low high resonance respectively, we found that angular dependence...
An $sp$-mixing model, which describes a compound nuclear reaction by mixing partial waves, predicts correlation term in this reaction. A detailed study of the model is required to feasibility new type time reversal symmetry violation search experiment. The ${\mathbit{\ensuremath{\sigma}}}_{n}\ifmmode\cdot\else\textperiodcentered\fi{}({\mathbit{k}}_{n}\ifmmode\times\else\texttimes\fi{}{\mathbit{k}}_{\ensuremath{\gamma}})$ $^{139}\mathrm{La}(\stackrel{P\vec}{n},\ensuremath{\gamma})$ has been...
A neutron-energy dependent angular distribution was measured for individual $\ensuremath{\gamma}$ rays from the 3.2 eV $p$-wave resonance of $^{131}\mathrm{Xe}+n$, that shows enhanced parity violation owing to a mixing between $s$- and amplitudes. The $\ensuremath{\gamma}$-ray transitions were identified, with respect neutron momentum evaluated as function energy 7132 keV rays, which correspond transition 1807 excited state $^{132}\mathrm{Xe}$. is considered originate interference...
The neutron energy-dependent angular distribution of $\ensuremath{\gamma}$ rays from the $^{117}\mathrm{Sn}(n,\ensuremath{\gamma})$ reaction was measured with germanium detectors and a pulsed beam. clearly observed in $\ensuremath{\gamma}$-ray emissions an energy 9327 keV which corresponds to transition resonance $^{117}\mathrm{Sn}+n$ ground state $^{118}\mathrm{Sn}$. causes angular-dependent asymmetric shape. An asymmetry ${A}_{\mathrm{LH}}$ defined as...
Largely enhanced parity-violating effects observed in compound resonances induced by epithermal neutrons are currently attributed to the mixing of parity-unfavored partial amplitudes entrance channel states. Furthermore, it is proposed that same mechanism enhances parity-violation also breaking time-reversal-invariance nucleus. The entrance-channel induces energy-dependent spin-angular correlations individual $\gamma$-rays emitted from nuclear state. For a detailed study model, $\gamma$-ray...
In this study, the germanium detector assembly, installed at Accurate Neutron-Nuclear Reaction measurement Instruments (ANNRI) in Material and Life Science Facility (MLF) operated by Japan Proton Accelerator Research Complex (J-PARC), has been characterized for extension to of angular distribution individual gamma-ray transitions from neutron-induced compound states. We have developed a Monte Carlo simulation code using GEANT4 toolkit, which can reproduce pulse-height spectra gamma-rays...
Neutron energy-dependent angular distributions were observed for individual $\gamma$-rays from the 0.74 eV p-wave resonance of $^{139}$La+$n$ to several lower excited states $^{140}$La. The $\gamma$-ray signals analyzed in a two dimensional histogram energy, measured with distributed germanium detectors, and neutron determined time-of-flight pulsed neutrons, identify energy dependence distribution each $\gamma$-rays. was also found photopeak accompanied faint component spectrum. Our results...
Bulk-heterojunction organic thin-film solar cells incorporating gold and silver nanoparticles were fabricated evaluated. These embedded in the hole-transport layer of cells. Plasmonic absorption peaks isolated confirmed from extinction spectra even material. The incorporation increased photoelectric conversion efficiency cells, whose enhancement ratio was further by mixing nanoparticles.
Abstract Characteristic ions (M+1)+ and (M+45)+, assigned to be the protonated monomer ion MH+ (M·CO2H)+ respectively, have been detected in mass spectrometric measurements of dimer molecules M2 higher clusters Mn some carboxylic acids produced their nozzle beams. It has shown from dependences relative intensities on stagnation conditions that these are mainly formed through fragmentation ions. The plays most important role processes dimers, while no M2+ was observed. These results discussed...
The construction is described of a monolithic thick-crystal perfect silicon neutron interferometer using an ultra-high-precision grinding technique and combination annealing chemical etching that differs from the prior interferometers. second to have been annealed after machining first be etching. Monitoring interference signal at each post-fabrication step provides measurement subsurface damage its alleviation. In this case, strain caused by manifests itself as spatially varying angular...
We performed a polarized neutron transmission asymmetry measurement utilizing the 139 La( n ,γ) 140 La reaction. This involved use of recently developed 3 He spin filter mounted on J-PARC MLF beam line number 4 (BL04). The resulting value longitudinal A L = (11.7 ± 1.1)% was found to be in good agreement with existing values literature suggesting that method by which we polarize is not significant source uncertainty. preliminary work represents first step toward future measurements angular...
Parity violating effects enhanced by up to 10 6 times compared proton-proton scattering have been observed in several neutron capture induced compound nuclei. This enhancement is explained as an interference between s-wave and a p-wave amplitude (s-p mixing). Theory predicts that this mechanism can also enhance T-violating effects. For estimation of promising candidate nucleus, we measured the angular distribution γ-rays (n,γ) reaction 139 La target. Experiments were performed at J-PARC,...
A possibility of new type experimental searches for physics beyond the standard model is being introduced in symmetry tests neutron-induced compound states according to successful operation intense pulsed neutron sources. The basis experiment design discussed.
It is theoretically suggested that the violation of charge conjugation and parity symmetry (CP-violation) could be enhanced in several compound nuclear reactions. According to CPT theorem time-reversal (T-violation) would too. The experimental sensitivity find a T-violating effect neutron-induced reactions depends on value spin factor κ( J ), which parameter specific for each nuclide. can determined from angular dependence γ-ray emission (n,γ) induced near p-wave resonance. In this paper,...
It is known that parity violation can be enhanced in compound nuclei due to mixing of s- and p-waves, it suggested time reversal invariance (T) by the same mechanism. We are planing a T-violation search using produced neutron capture reactions. Although 81 Br one candidate target nuclei, its sensitivity has not yet been determined. For an estimate latter, measurement angular distribution γ-rays emitted Br(n,γ) reaction was carried out November 2017, which we report first results.