N. Hayashi
A5026924308- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Particle physics theoretical and experimental studies
- Superconducting Materials and Applications
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Combustion and flame dynamics
- Magnetic confinement fusion research
- Advanced Combustion Engine Technologies
- Radiative Heat Transfer Studies
- Fire dynamics and safety research
- Nuclear reactor physics and engineering
- Fusion materials and technologies
- Atomic and Subatomic Physics Research
- Combustion and Detonation Processes
- Catalytic C–H Functionalization Methods
- Ionosphere and magnetosphere dynamics
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Molecular Junctions and Nanostructures
- Particle Detector Development and Performance
- Liquid Crystal Research Advancements
- Advanced NMR Techniques and Applications
- Molecular spectroscopy and chirality
- Engineering Applied Research
Fujita Health University
2024
Hyogo University
2024
National Institutes for Quantum Science and Technology
2024
Showa University
2023
University of Tsukuba
2023
Japan Atomic Energy Agency
2008-2022
Japan Proton Accelerator Research Complex
2006-2022
Kanagawa Institute of Technology
2016-2022
Panasonic (Japan)
2016-2021
Fuji Women's University
2020
Transverse momentum spectra for charged hadrons and neutral pions in the range 1 GeV/c<p(T)<5 GeV/c have been measured by PHENIX experiment at RHIC Au+Au collisions root square[s(NN)] = 130 GeV. At high p(T) from peripheral nuclear are consistent with scaling p+p average number of binary nucleon-nucleon collisions. The central significantly suppressed when compared to binary-scaled expectation, also similarly collisions, indicating a novel nuclear-medium effect energies.
We present the final results of spin asymmetries A1 and structure functions g1 proton deuteron in kinematic range 0.0008<x<0.7 0.2<Q2<100GeV2. For determination A1, addition to usual method which employs inclusive scattering events includes a large radiative background at low x, we use new minimizes by selecting with least one hadron as well muon state. find that this gives smaller errors for x<0.02, so it is combined provide optimal set results.Received 18 May...
Identified ${\ensuremath{\pi}}^{+/\ensuremath{-}}$, ${K}^{+/\ensuremath{-}}$, $p$, and $\overline{p}$ transverse momentum spectra at midrapidity in $\sqrt{{s}_{\mathrm{NN}}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}130\phantom{\rule{0ex}{0ex}}\mathrm{GeV}\phantom{\rule{0ex}{0ex}}\mathrm{Au}+\mathrm{Au}$ collisions were measured by the PHENIX experiment RHIC as a function of collision centrality. Average momenta increase with number participating nucleons similar way for all particle...
We present results for the charged-particle multiplicity distribution at midrapidity in Au-Au collisions square root of [s(NN)] = 130 GeV measured with PHENIX detector RHIC. For 5% most central we find dN(ch)/d eta(vertical line eta 0) 622+/-1(stat)+/-41(syst). The results, analyzed as a function centrality, show steady rise particle density per participating nucleon centrality.
Band bending is a fundamental issue for discussing organic devices. with Fermi level alignment between semiconductors and metals are often assumed, although the validity of this scheme in case has been not yet established. In paper, our recent efforts to examine band using Kelvin probe method (KPM) reported. After applicability KPM thick film – metal substrate system, results C60, TPD, Alq3 shown discuss films without intentional doping ultrahigh vacuum condition. Gradual was observed...
We observed high and persistent spontaneous buildup of the surface potential (SP) upon vacuum deposition tris(8-hydroxyquinolinato) aluminum(III) (Alq3) on an Au substrate under dark conditions. SP determined by Kelvin probe method reached 28 V at a thickness 560 nm Alq3 film was positively charged. propose model in which preferential orientation dipole moments molecules is origin this SP. The intensity second-harmonic generation also dramatically increased conditions, supports notion...
Neoclassical tearing modes (NTMs) will be the principal limit on performance in ITER standard scenario, which has beta well below ideal kink limit. Measurements of island size from ASDEX Upgrade, DIII-D and JET rampdown experiments are used to determine marginal for m/n = 3/2 NTM removal. This is compared with data JT-60U removal by electron cyclotron current drive (ECCD) at near constant beta. The empirical consistent both sets found about twice ion banana width. A common methodology...
Two-particle azimuthal correlation functions are presented for charged hadrons produced in Au+Au collisions at the Relativistic Heavy Ion Collider (sqrt [s(NN)]=130 GeV). The measurements permit determination of elliptic flow without event-by-event estimation reaction plane. extracted values (v2) show significant sensitivity to both collision centrality and transverse momenta emitted hadrons, suggesting rapid thermalization relatively strong velocity fields. When scaled by eccentricity zone...
Transverse momentum spectra and yields of hadrons are measured by the PHENIX collaboration in $\text{Au}+\text{Au}$ collisions at $\sqrt{{s}_{NN}}=130\phantom{\rule{0.3em}{0ex}}\text{GeV}$ Relativistic Heavy Ion Collider. The time-of-flight resolution allows identification pions to transverse momenta $2\phantom{\rule{0.3em}{0ex}}\text{GeV}∕c$ protons antiprotons $4\phantom{\rule{0.3em}{0ex}}\text{GeV}∕c$. yield rises approximately linearly with number nucleons participating collision, while...
We present a new measurement of the spin-dependent structure function g1d deuteron in deep inelastic scattering 190 GeV polarised muons on deuterons, kinematic range 0.003 < x 0.7 and 1 GeV2 Q2 60 GeV2. This is found to be negative at small x. The first moment Γ1d=∫01g1ddx evaluated Q02 = 10 0.034 ± 0.009 (stat.) 0.006 (syst.). value below Ellis-Jaffe sum rule prediction by three standard deviations. Using our earlier determination Γ1p, we obtain Γ1p − Γ1n 0.199 0.038 which agrees with Bjorken rule.
We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering polarised muons on protons deuterons in the range 0.003<x<0.7 Q2>1 GeV2. Compared to our previous publication this subject, with new data statistical errors have been reduced by nearly factor two. From these inclusive we determine quark distributions valence quarks non-strange sea at Q2=10 The u distribution, Δuv(x), is positive polarisation increases x. d...
Polarized parton distribution functions are determined by using world data from the longitudinally polarized deep inelastic scattering experiments. A new parametrization of is adopted taking into account positivity and counting rule. From fit to asymmetry A_1, u d valence quarks, sea gluon obtained. The results indicate that quark spin content \Delta\Sigma=0.20 0.05 in leading order (LO) next-to-leading-order (NLO) MS-bar scheme, respectively. However, if x dependence sea-quark fixed at...
This paper reports results on the progress in steady-state high-βp ELMy H-mode discharges JT-60U. A fusion triple product, nD(0)τETi(0), of 3.1 × 1020 m−3 s keV under full non-inductive current drive has been achieved at Ip = 1.8 MA, which extends record value product by 50%. high-beta plasma with βN ∼ 2.7 sustained for 7.4 (∼60τE), duration determined only facility limits, such as capability poloidal field coils and upper limit injection neutral beams. Destabilization neoclassical tearing...
Transverse momentum spectra of electrons from Au+Au collisions at square root[s(NN)] = 130 GeV have been measured midrapidity by the PHENIX experiment Relativistic Heavy Ion Collider. The show an excess above background photon conversions and light hadron decays. electron signal is consistent with that expected semileptonic decays charm. yield dN(e)/dy for p(T) > 0.8 GeV/c 0.025+/-0.004(stat)+/-0.010(syst) in central collisions, corresponding charm cross section 380+/-60(stat)+/-200(syst)...
Two-pion correlations in square root[s(NN)] = 130 GeV Au+Au collisions at RHIC have been measured over a broad range of pair transverse momentum k(T) by the PHENIX experiment RHIC. The dependent radii are similar to results from heavy-ion 4.1, 4.9, and 17.3 GeV, whereas longitudinal radius increases monotonically with beam energy. ratio outwards sidewards (R(out)/R(side)) is consistent unity independent k(T).
This study addresses the question of band bending at C60/metal interface. The change in energy vacuum level upon deposition C60 on various metal substrates (Au, Cu, and Ag) was examined by Kelvin probe method under ultrahigh as a function thickness d. We observed (1) an abrupt shift relative to Fermi substrate εvacF d⩽1 nm, uniform value about 4.65 eV all interfaces (2) slower with further C60, which stopped d∼500 nm another common value. These gradual shifts can be ascribed formation...
The first measurement of energy produced transverse to the beam direction at Relativistic Heavy-Ion Collider Brookhaven National Laboratory is presented. midrapidity density per participating nucleon rises steadily with number participants, closely paralleling rise in charged-particle density, such that <E(T)>/<N(ch)> remains relatively constant as a function centrality. calculated via Bjorken's prescription for 2% most central Au+Au collisions square root[s(NN)] = 130 GeV least epsilon(Bj)...
A high confinement equilibrium with nearly zero toroidal current in the central region (a "current hole") has been observed for first time to persist stably several seconds JT-60U tokamak. This observation indicates possibility of stable tokamak operation without current; previously believed be necessary tokamaks. The radius hole extended up 40% plasma minor radius. It was that formed by increase off-axis noninductive current.
Abstract Organic-based solar cells potentially offer a photovoltaic module with low production costs and hazard risk of the components. We report organic dye-sensitized cells, fabricated molecular designed indoline dyes in conjunction highly reactive but robust nitroxide radical molecules as redox mediator quasi-solid gel form electrolyte. The achieve conversion efficiencies 10.1% at 1 sun maintain output performance even under interior lighting. dyes, customized by introducing long alkyl...
We present a next-to-leading order QCD analysis of the presently available data on spin structure function g1 including final from Spin Muon Collaboration. results for first moments proton, deuteron, and neutron functions, determine singlet nonsinglet parton distributions in two factorization schemes. also test Bjorken sum rule find agreement with theoretical prediction at level 10%.Received 18 May 1998DOI:https://doi.org/10.1103/PhysRevD.58.112002©1998 American Physical Society
We present results on the measurement of $\ensuremath{\Lambda}$ and $\overline{\ensuremath{\Lambda}}$ production in $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ collisions at $\sqrt{{s}_{NN}}=130\text{ }\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$ with PHENIX detector Relativistic Heavy Ion Collider. The transverse momentum spectra were measured for minimum bias 5% most central events. $\overline{\ensuremath{\Lambda}}/\ensuremath{\Lambda}$ ratios are constant as a function ${p}_{T}$ number...
We present a measurement of the longitudinal spin cross section asymmetry for deep-inelastic muon-nucleon interactions with two high transverse momentum hadrons in final state. Two methods event classification are used to increase contribution photon-gluon fusion process above 30%. The most effective one, based on neural network approach, provides asymmetries Al→NlhhXp=0.030±0.057(stat)±0.010(syst) and Al→NlhhXd=0.070±0.076(stat)±0.010(syst). From these values we derive an averaged gluon...
We present a new measurement of the spin-dependent structure function g1d deuteron from deep inelastic scattering 190 GeV polarized muons on deuterons. The results are combined with our previous measurements g1d. A perturbative QCD evolution in next-to-leading order is used to compute g1d(x) at constant Q2. At Q2 = 10 GeV2, we obtain first moment Γ1d=∫1dg1ddx=0.041±0.008, flavour-singlet axial charge nucleon a0 0.30 ± 0.08, and an strange quark as −0.09 0.03. Using earlier determination Γ1p,...