Toshiyuki Nakano
A5102411302- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- High voltage insulation and dielectric phenomena
- Radiation Therapy and Dosimetry
- Advanced Optical Sensing Technologies
- Organometallic Complex Synthesis and Catalysis
- Atomic and Subatomic Physics Research
- Surfactants and Colloidal Systems
- Semiconductor Lasers and Optical Devices
- Metalloenzymes and iron-sulfur proteins
- High-Energy Particle Collisions Research
- Epoxy Resin Curing Processes
- Adhesion, Friction, and Surface Interactions
- Material Properties and Processing
- Smart Materials for Construction
- Phase-change materials and chalcogenides
- Graphite, nuclear technology, radiation studies
- Fluid Dynamics Simulations and Interactions
- Magnetic Properties and Applications
Nagoya University
2016-2025
Okayama University of Science
2021-2023
Gifu University
2021-2023
Kobe University
2021-2023
Institution of Engineering and Technology
2023
Aichi University of Education
2021-2023
RIKEN Nishina Center
2023
Toshiba (Japan)
1992-2017
Obayashi (Japan)
2015-2017
Japan Synchrotron Radiation Research Institute
2015
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...
$\mathrm{FASER}\ensuremath{\nu}$ 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 first results of the study high-energy electron neutrino (ν_{e}) and muon (ν_{μ}) charged-current interactions in FASERν emulsion-tungsten detector FASER experiment at LHC are presented. A 128.8 kg subset volume was analyzed after exposure to 9.5 fb^{-1} sqrt[s]=13.6 TeV pp data. Four (eight) ν_{e} interaction candidate events observed with a statistical significance 5.2σ (5.7σ). This is direct observation particle collider includes highest-energy ν_{μ} ever detected from an artificial...
Automatic nuclear emulsion readout systems have seen remarkable progress since the original idea was developed almost 40 years ago. After success of its full application to a large-scale neutrino experiment, OPERA, much faster system, hyper-track selector (HTS), has been developed. HTS, which an extremely wide-field objective lens, reached scanning speed 4700 cm|$^2$|/h, is nearly 100 times than previous system and therefore strongly promotes many new experimental projects. We will describe...
In the DsTau experiment at CERN SPS, an independent and direct way to measure tau neutrino production following high energy proton interactions was proposed. As main source of neutrinos is a decay Ds mesons, produced in proton-nucleus interactions, project aims measuring differential cross section this reaction. The experimental method based on use resolution emulsion detectors for effective registration events with short lived particle decays. Here we present motivation study, details...
FASERnu is a proposed small and inexpensive emulsion detector designed to detect collider neutrinos for the first time study their properties. will be located directly in front of FASER, 480 m from ATLAS interaction point along beam collision axis unused service tunnel TI12. From 2021-23 during Run 3 14 TeV LHC, roughly 1,300 electron neutrinos, 20,000 muon 20 tau interact with TeV-scale energies. With ability observe these interactions, reconstruct energies, distinguish flavors, probe...
FASER is a new experiment designed to search for light weakly-interacting long-lived particles (LLPs) and study high-energy neutrino interactions in the very forward region of LHC collisions at CERN. The experimental apparatus situated 480 m downstream ATLAS interaction-point aligned with beam collision axis. detector includes four identical tracker stations constructed from silicon microstrip detectors. Three form tracking spectrometer, enable detect decay products LLPs decaying inside...
The interfacial and thermodynamic properties of nonionic surfactants their mixtures are both theoretical practical interest. used in this study polyoxyethylene (10) alkyl ether [CnE10; m = 10 n 12, 16] N-decanoyl-N-methylglucamine (MEGA-10). critical micelle concentrations pure were determined by surface tension measurements at different mixed ratios temperatures. Interfacial parameters such as the maximum excess (Γmax) minimum area per molecule (Amin) air/water interface also from data....
The Forward Search Experiment (FASER) at CERN’s Large Hadron Collider (LHC) has recently directly detected the first collider neutrinos. Neutrinos play an important role in all FASER analyses, either as signal or background, and it is therefore essential to understand neutrino event rates. In this study, we update previous simulations present prescriptions for theoretical predictions of fluxes cross sections, together with their associated uncertainties. With these results, discuss potential...
Abstract The DsTau(NA65) experiment at CERN was proposed to measure an inclusive differential cross-section of $$D_s$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>D</mml:mi> <mml:mi>s</mml:mi> </mml:msub> </mml:math> production with decay tau lepton and neutrino in p – A interactions. DsTau detector is based on the nuclear emulsion technique, which provides excellent spatial resolution for detecting short-lived particles like charmed hadrons. This paper...
Micelle formation of a combination hydrocarbon/fluorocarbon anionic surfactantssodium n-tetradecyl sulfate (STDS) and sodium perfluorononate (SPFN) in waterwas studied, paying special attention to the interaction between two surfactants aggregation number, N, as function composition mixture (XSTDS). The critical micellization concentration (cmc) at each was determined discrete temperatures by plotting derivative specific conductance (∂κ/∂C) against root molarity (√C) 40 °C. This plot enabled...
Recent rapid progress in nanotechnology has focused research and development efforts on new high performance materials. Organic-inorganic hybrid materials such as nylon-layered silicate nanocomposites have attracted special interest various studies continue to be conducted thermoplastic resins.In this study, we found out the best organic modifier of layered that contributed an affinity for epoxy resin (thermosetting resin), succeeded creating intercalated-type epoxy-layered nanocomposite....
Temperature studies were performed on the micelle formation of a series anionic surfactants, i.e. Na salts α-sulfonatomyristic acid methyl, ethyl, and propyl esters (abbreviated as α-SMy·Me, α-SMy·Et α-SMy·Pr, respectively) in water, paying special attention to effects number carbon atoms alkyl chain attached near hydrophilic group (−SO3) micellar properties, such critical micellization concentration (cmc) degree counterion binding (β) or electrolytic dissociation micelles (α). The...
We are developing the GRAINE project, which consists of a 10 MeV–100GeV cosmic |$\gamma$|-ray observation with precise (0.08|$^\circ$| at 1–2GeV) and polarization-sensitive (50% or below minimum detectable polarization for Vela pulsar above 100 MeV) large-aperture-area (|$\sim$|10m|$^2$|) emulsion telescope, by repetitive long duration balloon flights. In 2015, we performed Japan–Australia JAXA collaborative experiment Alice Springs balloon-launching station. The telescope had 3780cm|$^2$|...
The read-write characteristics of an optical disk utilizing a blue-laser diode are examined, applying land and groove recording partial response maximum likelihood (PRML) to two systems: 1) 0.85 numerical aperture (NA) system consisting objective lens with NA thin cover layer on thickness 0.1 mm 2) 0.65 0.6-mm-thick substrate. In the system, track pitch data bit length employed for experiment 0.29 µm 0.0987 µm, respectively. These parameters correspond capacity 30 GB/side. they 0.37 0.155...
Abstract In 50% (v/v) DMF– and DMA–H2O mixed solvents, salt effects on the solvolysis reaction rates of aliphatic halides related compounds (RX) have been examined for further exploring. Compared with previous results obtained in other organic solvent systems, such as acetone–, 1,4-dioxane–, or sulfolane–H2O, no exceptional behavior was observed “pseudo” first-order rate constants (k/s−1) all typical SN1 SN2 substrates by addition alkali metal alkaline earth perchlorates many kinds...
Abstract Tau neutrino is the least studied lepton of Standard Model (SM). The NA65/DsTau experiment targets to investigate D s , parent particle ν τ using nuclear emulsion-based detector and decrease systematic uncertainty flux prediction from over 50 % 10 for future beam dump experiments. In experiment, emulsion detectors are exposed CERN SPS 400 GeV proton beam. To provide optimal conditions reconstruction interactions, protons required be uniformly distributed detector's surface with an...
The correlation between the enthalpy (ΔH 0m) and entropy (ΔS on micelle formation of more than 20 species surfastants (including nonionic, anionic cationic species) or their mixtures reported in past was examined by plots ΔH 0m vs ΔS 0m. For each surfactant system a linear relation having almost same slope (1/307 K-1), allowing for small margin error (±2.3%), shown, but different intercept (σ), dependent species, i. e., 0m=(1/307) 0m+σ, where 1/307 (K-1) means that so called compensation...
We describe the precise gamma-ray observation project Gamma-Ray Astro-Imager with Nuclear Emulsion (GRAINE), which uses balloon-borne emulsion telescopes. The telescope realizes observations high angular resolution, polarization sensitivity, and large aperture area in 0.01–100 GeV energy region. report on data analysis of tracks first demonstration imaging via an by using flight from balloon experiment performed 2015 (GRAINE 2015). films were scanned latest read-out system for a total 41...
During the years 1994–1997, emulsion target of CHORUS detector was exposed to Wide Band Neutrino Beam from CERN-SPS. About 170 000 neutrino interactions were successfully located in emulsion. Improvements automatic scanning systems and application different criteria allowed sample events be used for studies charm production. We present a measurement production rate D0 mesons based on 25 693 νμ charged-current (CC) analysed so far. After reconstruction event topology vertex region, 283 decays...