A5040261302- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Gyrotron and Vacuum Electronics Research
- Quantum, superfluid, helium dynamics
- Boron Compounds in Chemistry
- Neutrino Physics Research
- Medical Imaging Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Dark Matter and Cosmic Phenomena
- Plasma Diagnostics and Applications
- Heat Transfer and Optimization
- Advanced NMR Techniques and Applications
- Earthquake Detection and Analysis
- Astrophysics and Cosmic Phenomena
Japan Proton Accelerator Research Complex
2015-2023
High Energy Accelerator Research Organization
2014-2023
Mitsubishi Electric (Japan)
2019
Tohoku University
2007-2017
Japan Atomic Energy Agency
2013-2016
Advanced Science Research Center
2016
Gifu University
2011
Akita University
2011
Czech Academy of Sciences, Nuclear Physics Institute
2011
National Institute of Technology, Ichinoseki College
2011
The photoproduction process of neutral kaons on a liquid deuterium target is investigated near the threshold region, Eγ=0.8−1.1 GeV. K0 events are reconstructed from positive and negative pions, differential cross sections derived. Experimental momentum spectra compared with those calculated in spectator model using realistic deuteron wave function. Elementary amplitudes as given by recent isobar models simple phenomenological used to study effect new data angular behavior elementary...
We performed a high-power test of new radio-frequency quadrupole (RFQ II) for the J-PARC linac. RFQ II was developed as spare because operating has suffered from sparking problem. First, conditioning carried out; after 50 h conditioning, became very stable with nominal power and duty 330 kW 3%, respectively. Next thermal properties were measured resonant frequency is tuned by changing temperature cooling water. The response compared to finite-element method simulation results, confirming...
The level structure of the |${}^{12}_{\Lambda }{\rm C}$| hypernucleus was precisely determined by means |$\gamma$|-ray spectroscopy. We identified four transitions via |${}^{12}{\rm C}(\pi ^{+ },K^{+ }\gamma )$| reaction using a germanium detector array, Hyperball2. spacing ground-state doublet |$(2^{-},1^{-}_{1})$| measured to be |$161.5 \pm 0.3{\text {(stat)}}\pm 0.3(\hbox {syst})$|keV from direct |$M1$| transition. Excitation energies |$1^{-}_{2}$| and |$1^{-}_{3}$| states were |$2832\pm...
Muons have been accelerated by using a radio-frequency accelerator for the first time. Negative muonium atoms (${\mathrm{Mu}}^{\ensuremath{-}}$), which are bound states of positive muons (${\ensuremath{\mu}}^{+}$) and two electrons, generated from ${\ensuremath{\mu}}^{+}$'s through electron capture process in an aluminum degrader. The ${\mathrm{Mu}}^{\ensuremath{-}}$'s initially electrostatically injected into quadrupole linac (RFQ). In RFQ, to 89 keV. identified momentum measurement time...
We performed a beam test of new radio frequency quadrupole linac (RFQ III) for the current upgrade Japan Proton Accelerator Research Complex. First, conditioning RFQ III was conducted, and after 20 h conditioning, became very stable with nominal peak power duty factor 400 kW 1.5%, respectively. An off-line subsequently conducted before installation in accelerator tunnel. The transmission, transverse emittance, energy spread 50-mA negative hydrogen from were measured compared simulation...
We conducted a high-power test of prototype cavity 324-MHz interdigital H-mode drift tube linac (IH-DTL) for the precise measurement muon anomalous magnetic moment ($g\ensuremath{-}2$) and electric dipole (EDM). This (short IH) was developed to verify fabrication methodology IH-DTL with monolithic structure. The electromagnetic field distribution measured compared finite element method simulation results, accuracy confirmed satisfy requirements. After 40 h conditioning, short IH stably...
The π+π− photoproductions on the proton and deuteron have been studied in a photon energy range of 0.8–1.1 GeV at Laboratory Nuclear Science, Tohoku University. Charged pions protons were detected using Neutral Kaon Spectrometer. We obtained cross sections for p(γ,pπ+π−) d(γ,pπ+π−)n. quasi-free process with neutron spectator was extracted by momentum cut pn>0.3GeV/c. section Δ++Δ− production deduced non-quasi-free γd→pnπ+π−. It 13.4±0.4μb Eγ=0.82GeV.
The photoproduction of K0 and Λ on the deuteron was measured in order to investigate γn → K0Λ reaction process near threshold (Eγ = 0.8-1.1 GeV). events were clearly seen π+π− pπ− invariant mass spectra, respectively. momentum spectra γd K0X ΛX reactions derived. Additionally, energy dependence integral cross section for production also obtained. agreement with previous results within statistical errors. angular distribution center system extracted it had backward distribution. total...
Abstract A disk and washer (DAW) coupled cavity linac (CCL) was developed for a mediumvelocity part in muon to measure anomalous magentic moment search electric dipole moment. Muons were accelerated from v / c = β 0.3 0.7 at an operational frequency of 1.3 GHz. In this paper, the design, beam dynamics cold-model measurements are presented.
A study of the |$^2$|H|$({\gamma},{\Lambda})$|X reaction was performed using a tagged photon beam at Research Center for Electron Photon Science (ELPH), Tohoku University. The photoproduced |$\Lambda$| measured in |$p{\pi^{-}}$| decay channel by upgraded Neutral Kaon Spectrometer (NKS2+). momentum integrated differential cross section determined as function scattering angle |${\Lambda}$| laboratory frame five energy bins. Our results indicated peak angles smaller than...