A5028781483- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Radiation Detection and Scintillator Technologies
- Nuclear reactor physics and engineering
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Graphite, nuclear technology, radiation studies
- Particle Detector Development and Performance
- Radioactive contamination and transfer
- Particle accelerators and beam dynamics
- Medical Imaging Techniques and Applications
- Radioactivity and Radon Measurements
- Particle Accelerators and Free-Electron Lasers
- Electron and X-Ray Spectroscopy Techniques
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Radiation Effects in Electronics
- Muon and positron interactions and applications
- Nuclear Materials and Properties
- Dark Matter and Cosmic Phenomena
- X-ray Spectroscopy and Fluorescence Analysis
- Quantum, superfluid, helium dynamics
- Advanced Radiotherapy Techniques
- Radioactive Decay and Measurement Techniques
- Particle physics theoretical and experimental studies
Niigata University
2025
High Energy Accelerator Research Organization
2015-2024
The Graduate University for Advanced Studies, SOKENDAI
2014-2024
RIKEN Nishina Center
2020
Deleted Institution
2019
SPring-8
2017
Linac Coherent Light Source
2009
SLAC National Accelerator Laboratory
2009
Tohoku University
1996-2001
Experimental data of photoneutron double differential cross-sections (DDXs) on 181 Ta and 209 Bi for photon energies 13 MeV 17 were incorporated into the photonuclear evaluation using CCONE code system reaction cross-section from EXFOR database. By increasing preequilibrium emissions through a reduction in single-particle state density neutron target nuclei within exciton model, results, including DDXs photons, show good agreement with corresponding experimental data. However, results...
The double differential cross-sections (DDXs) of photoneutron production via the photonuclear reaction on tantalum, tungsten, and bismuth for 13 17 MeV linearly polarized photon beams were measured using time-of-flight method at NewSUBARU-BL01 facility. Polarized photons obtained by Laser Compton backscattering (LCS) technique. Two distinct components observed spectra: lowenergy component up to 4 high-energy above MeV. angular distribution low-energy was isotropic, whereas distributed...
To determine absolute scintillation yields due to alpha particles in high-pressure rare gases, the number of photons N/sub p/ was measured using a vacuum ultraviolet (VUV) sensitive photodiode with spectral quantum efficiency q/sub e/(/spl lambda/) as function wavelength /spl lambda/. The photoelectrons from photocathode pe/ charge-sensitive preamplifier calibrated respect charge number. collection for F/sub ce/ at determined solid angle subtended by point under condition that there are no...
Neutron energy spectra behind iron and concrete shields have been measured at the anti-proton production target station in Fermi National Accelerator Laboratory to provide shielding benchmark data of neutrons produced from 120-GeV proton induced reaction.To measure neutron radiation bursts accompanied by injection intense pulsed beam into target, we developed a current readout technique multi-moderator spectrometer.We employed pair BF 3 proportional counters filled with different 10 B...
The absolute numbers of scintillation photons and electrons produced by 5.49 MeV alpha particles were measured simultaneously in argon, krypton xenon the gas pressure range from 1.01/spl times/10/sup 5/ Pa to 6/ Pa. ratio number excited atoms electron-ion pairs is an important quantity for understanding energy pathway absorbed radiation was found be 0.52, 0.55, 0.60 xenon, respectively. ratios determined measuring originating electrons. value W/sub s/, which defined as average produce one...
AbstractAbstractExperimental studies of shielding and radiation effects are carried out at Fermi National Accelerator Laboratory (FNAL) under collaboration between FNAL Japan, aiming benchmarking simulation codes studying irradiation for the upgrade design new high-energy accelerator facilities. The purposes this (a) acquisition data in a proton beam energy region above 100 GeV, (b) further evaluation predictive accuracy PHITS MARS codes, (c) modification physics models these if needed, (d)...
In the radiation fields of high energy accelerator facilities, high-altitude aircraft and space flights, high-energy neutron dosimetry ∼20 MeV or more is a significant issue for radiological protection. We studied feasibility experimental measurements linear transfer (LET) distributions secondary charged particles induced by fast neutrons using CR-39 plastic nuclear track detectors. order to investigate method analyzing detectors that appropriate dosimetry, two-layer stacks were exposed...
The beam delivery system for the linear collider focuses beams to nanometer sizes at its interaction point, collimates halo provide acceptable background in detector and has a provision state-of-the art instrumentation order reach ILC's physics goals. This paper describes design details status of baseline configuration considered reference also lists alternatives.
The time variations in the dose rate and γ spectrum of radio nuclides originating from accident Fukushima Daiichi Nuclear Power Station were measured at Tsukuba City, Ibaraki, during period 15th March to 9th April 2011. radiation peaked three times 16th (1.27 μSv/h maximum). contribution Xe-133 was observed obtained 5 h measurement peaks on March, indicating that radioactive plume passed through City time. After peaks, a increase with rainfall 21th dominating integral City. after comes...
Study of Muon Interaction and Neutron detection -a program for studies shielding irradiation effect around high energy accelerators has been started until 2007 using proton located in Fermi National Accelerator Laboratory (FNAL) as a collaboration JAPAN FNAL.The series the presentations entitled "Shielding experiments at Fermilab" describes part results this regarding transport secondary particles, neutron muon, from 120 GeV induced reactions through experimental data simulation.In paper,...
The Slow Positron Facility at the Institute of Material Structure Science (IMSS) High Energy Accelerator Research Organization (KEK) is a user dedicated facility with an energy tunable (0.1 – 35 keV) slow positron beam produced by 55MeV linac. present line branches have been used for positronium time-of-flight (Ps-TOF) measurements, transmission microscope (TPM) and photo-detachment Ps negative ions (Ps−). During year 2010, reflection high-energy diffraction (RHEPD) measurement station going...
The energy spectra as well the angular distribution of photo-neutrons, called double differential cross sections (DDXs) (γ, xn) reaction were measured for 16.6 MeV linearly polarized photons on Pb, Au, Sn, Cu, Fe, and Ti targets. Polarized prepared using laser Compton scattering technique at BL01, NewSUBARU, Hyogo, Japan. photo-neutrons liquid organic scintillators, placed six different angles. time-of-flight was used to determine neutron energy. low high components DDXs identified all Flat...
We evaluate the neutron and muon fluxes produced in ILC beam dumps by Monte Carlo simulations discuss their potential use irradiation fields. show that can provide high-intensity with spectra quite similar to secondary cosmic rays, which are suitable for soft error studies. The deliver neutrons about $10^{11}$ times rays on spaces perpendicular axis muons $10^8$ downstream of initial phase ILC. Large-area 1\,m$^2$ or more is possible. Differences energy distribution electron positron also...
A shielding experiment using activation detectors was performed at the CERN High-energy AcceleRator Mixed-field (CHARM) facility and Shielding Benchmark Facility (CSBF). The protons (24 GeV/c) were bombarded into a 50-cm-thick copper target, released neutrons transmitted through various shields located vertically upward from target. Ordinary concrete slabs of 40- to 160-cm thicknesses steel 20- 80-cm installed by changing material thickness shield. Activation bismuth, indium, aluminum,...
Experiments of high-energy neutron streaming were performed in the access maze CERN High-energy AcceleRator Mixed-field (CHARM) facility where high-intensity proton beams 24 GeV/c impact on a copper target. The secondary neutrons through various legs ramified was measured using aluminium activation detectors installed at 12 different locations: for first time, extended coverage measurement locations allowed to assess more distant areas maze. attenuation profile along via production 24Na also...
A quasi-monoenergetic photon field with energy of ∼200 keV was obtained using a radioactive source backscatter layout. The layout allows the calibration dosimeter for two different energies single source. setup optimized through calculations and experiments to minimize low component obtain uniformity. optimal found comprise 1 × m2 steel floor, placed 20 cm above 10-cm cubic lead block directly Under proposed 208-MBq Cs-137 source, monoenergetic 190 ± 9.6 (FWHM) dose rate 3.18 0.18 µSv/h...
Time histories of the I-131 concentration in air at monitoring posts Fukushima prefecture March 2011 were estimated using pulse height distribution a NaI(Tl) detector, which was opened to public. Several corrections necessary owing high count rates. The contribution rates from accumulated around post on basis time history peak rate by method proposed authors. concentrations converted calculated response detector with egs5 for model plume containing uniformly. obtained fixed point first ones...