Mitsuhiro Nakamura
A5091878958- Advanced Radiotherapy Techniques
- Particle physics theoretical and experimental studies
- Medical Imaging Techniques and Applications
- Radiation Therapy and Dosimetry
- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Advanced X-ray and CT Imaging
- Radiation Dose and Imaging
- Dark Matter and Cosmic Phenomena
- Lung Cancer Diagnosis and Treatment
- Particle Detector Development and Performance
- Radiomics and Machine Learning in Medical Imaging
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Gamma-ray bursts and supernovae
- Radiation Detection and Scintillator Technologies
- Management of metastatic bone disease
- Medical Imaging and Analysis
- Gastric Cancer Management and Outcomes
- Medical Image Segmentation Techniques
- Nuclear physics research studies
- Inflammatory Bowel Disease
- Advances in Oncology and Radiotherapy
- Optical Network Technologies
Kyoto University
2016-2025
Gifu Pharmaceutical University
2022-2025
Kyushu University Hospital
2025
Waseda University
2024
Japanese Society of Medical Oncology
2024
Aichi University of Education
1986-2023
Okayama University of Science
2021-2023
Kobe University
1993-2023
Nagoya University
2014-2023
Kanazawa University
2005-2023
A bstract The OPERA neutrino experiment is designed to perform the first observation of oscillations in direct appearance mode ν μ → τ channel, via detection -leptons created charged current interactions. detector, located underground Gran Sasso Laboratory, consists an emulsion/lead target with average mass about 1.2 kt, complemented by electronic detectors. It exposed CERN Neutrinos beam, a baseline 730 km and mean energy 17 GeV. candidate event analysis 2008-2009 sample have been reported...
We report the first direct observation of neutrino interactions at a particle collider experiment. Neutrino candidate events are identified in 13.6 TeV center-of-mass energy pp collision dataset 35.4 fb^{-1} using active electronic components FASER detector Large Hadron Collider. The candidates required to have track propagating through entire length and be consistent with muon charged-current interaction. infer 153_{-13}^{+12} significance 16 standard deviations above background-only...
We have studied stars in nuclear emulsion due to the capture at rest of Ξ- hyperons produced (K-, K+) reaction. The sequential weak decay a double hypernucleus (nucleus with S = -2) has been directly observed. is assigned as either 10ΛΛBe or 13ΛΛB. This assignment excludes existence H dibaryon lighter than 2203.7 ±0.7 MeV/c2.
SiO/sub 2/ added CoPtCr magnetic layers are employed for perpendicular recording media. The microstructure, properties, and performance of these media discussed. Very fine grains (size /spl sim/7 nm), surrounded by amorphous-like grain boundaries, realized together with good c-axis orientation normal to the film plane. It is considered that addition very effective in realizing a well-isolated fine-grain structure without disturbing epitaxial growth on Ru underlayer. medium 12-nm-thick layer...
We present the case for a dark matter detector with directional sensitivity. This document was developed at 2009 CYGNUS workshop on detection, and contains contributions from theorists experimental groups in field. describe need sensitivity; each experiment presents their project's status; we close feasibility study scaling up to one ton detector, which would cost around $150M.
The OPERA experiment was designed to search for $\nu_{\mu} \rightarrow \nu_{\tau}$ oscillations in appearance mode, i.e. by detecting the $\tau$-leptons produced charged current $\nu_{\tau}$ interactions. took data from 2008 2012 CERN Neutrinos Gran Sasso beam. observation of appearance, achieved with four candidate events a sub-sample data, previously reported. In this paper, fifth event, found an enlarged sample, is described. Together further reduction expected background, detected so far...
We have studied the absorption spectrum of argon in 50-\AA{} region. The discrete structure observed near ${L}_{\mathrm{II},\mathrm{III}}$ edge is attributed to excitations a $2p$ electron high-lying Rydberg states which converge $^{2}P_{\frac{3}{2}}({L}_{\mathrm{III}})$ and $^{2}P_{\frac{1}{2}}({L}_{\mathrm{II}})$ ion. energy values ${L}_{\mathrm{II}}$ ${L}_{\mathrm{III}}$ levels atom are found be 250.55 \ifmmode\pm\else\textpm\fi{} 0.05 248.52 eV, respectively.
The OPERA experiment was designed to study ν_{μ}→ν_{τ} oscillations in the appearance mode CERN Gran Sasso Neutrino beam (CNGS). In this Letter, we report final analysis of full data sample collected between 2008 and 2012, corresponding 17.97×10^{19} protons on target. Selection criteria looser than previous analyses have produced ten ν_{τ} candidate events, thus reducing statistical uncertainty measurement oscillation parameters properties. A multivariate approach for event identification...
PurposeA study of real-time adaptive radiotherapy systems was performed to test the hypothesis that, across delivery and institutions, dosimetric accuracy is improved with treatments over non-adaptive in presence patient-measured tumor motion.Methods materialsTen institutions robotic(2), gimbaled(2), MLC(4) or couch tracking(2) used common materials including CT structure sets, motion traces planning protocols create a lung prostate plan. For each trace, plan delivered twice moving...
The Global Quality Assurance of Radiation Therapy Clinical Trials Harmonization Group (GHG) is a collaborative group (RTQA) Groups harmonizing and improving RTQA for multi-institutional clinical trials. objective the GHG OAR Working was to unify contouring guidance across groups by compiling single reference list OARs in line with AAPM TG 263 ASTRO, together peer-reviewed, anatomically defined integration into trial protocols independent radiation therapy delivery technique.The comprised 22...
$\mathrm{FASER}\ensuremath{\nu}$ at the CERN Large Hadron Collider (LHC) is designed to directly detect collider neutrinos for first time and study their cross sections TeV energies, where no such measurements currently exist. In 2018, a pilot detector employing emulsion films was installed in far-forward region of ATLAS, 480 m from interaction point, collected $12.2\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ proton-proton collision data center-of-mass energy 13 TeV. We describe...
The FASER experiment at the LHC is designed to search for light, weakly-interacting particles produced in proton-proton collisions ATLAS interaction point that travel far-forward direction. first results from a dark photons decaying an electron-positron pair, using dataset corresponding integrated luminosity of 27.0 fb−1 collected center-of-mass energy s=13.6 TeV 2022 Run 3, are presented. No events seen almost background-free analysis, yielding world-leading constraints on with couplings...
Abstract FASER, the ForwArd Search ExpeRiment, is an experiment dedicated to searching for light, extremely weakly-interacting particles at CERN's Large Hadron Collider (LHC). Such may be produced in very forward direction of LHC's high-energy collisions and then decay visible inside FASER detector, which placed 480 m downstream ATLAS interaction point, aligned with beam axis. also includes a sub-detector, ν , designed detect neutrinos LHC study their properties. In this paper, each...
The superprism effect allows wide-angle deflection of the light beam in a photonic crystal (PC) by slight change wavelength or incident angle. In this paper, we discuss such outside PC, which is expected when output end PC tilted against input end. analysis dispersion surfaces indicates angle /spl plusmn/50/spl deg/ two-dimensional composed triangular lattice airholes changing plusmn/2/spl plusmn/2%. Light deflections inside and are numerically demonstrated finite difference time-domain...
The aim of this paper is to assess the overall geometric accuracy Novalis system using Robotic Tilt Module in terms uncertainty frameless stereotactic radiotherapy. We analyzed following three metrics: (1) correction robotic couch, (2) isocenter position with gantry and couch rotation, (3) shift between central point detected ExacTrac x-ray system. Based on concept uncertainty, was calculated from these values. positional 0.07 ± 0.22 mm, associated rotation 0.35 0.38 mm difference 0.30 mm....
Purpose: To compare the dosimetric performance of Acuros XB (AXB), anisotropic analytical algorithm (AAA), and x‐ray voxel Monte Carlo (XVMC) in heterogeneous phantoms lung stereotactic body radiotherapy (SBRT) plans. Methods: Water‐ lung‐equivalent were combined to evaluate percentage depth dose profile. The radiation treatment machine Novalis (BrainLab AG, Feldkirchen, Germany) with an beam energy 6 MV was used calculate doses composite phantom at a source‐to‐surface distance 100 cm gantry...
Purpose The dosimetric accuracies of volumetric modulated arc therapy (VMAT) plans were predicted using plan complexity parameters via machine learning. Methods dataset consisted 600 cases clinical VMAT from a single institution. predictor variables ( n = 28) for each included parameters, type, and photon beam energy. Dosimetric measurements performed helical diode array (ArcCHECK), the accuracy passing rates 5% dose difference (DD5%) gamma index 3%/3 mm (γ3%/3 mm) three learning models:...