Takahiro Nishi
A5055372581- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Atomic and Molecular Physics
- High-Energy Particle Collisions Research
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Advanced NMR Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Physics Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Black Holes and Theoretical Physics
- Physics of Superconductivity and Magnetism
- Sensor Technology and Measurement Systems
- Superconducting Materials and Applications
- Mass Spectrometry Techniques and Applications
- Superconducting and THz Device Technology
- Advanced Measurement and Detection Methods
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Nuclear reactor physics and engineering
RIKEN Nishina Center
2014-2024
RIKEN
2019
The University of Tokyo
2012-2018
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati
2015
Jagiellonian University
2015
Institute of Physics
2015
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2015
Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre
2015
National Centre for Nuclear Research
2015
Sapienza University of Rome
2015
A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186 MeV/u. The energy of 0.83±0.65(stat)±1.25(syst) MeV above threshold four-neutron decay with a significance level 4.9σ. Utilizing large positive Q value (^{8}He,^{8}Be) reaction, an almost recoilless condition system was achieved so as to obtain weakly interacting efficiently.
Excitation spectra of $^{11}\mathrm{C}$ are measured in the $^{12}\mathrm{C}(p,d)$ reaction near ${\ensuremath{\eta}}^{\ensuremath{'}}$ emission threshold. A proton beam extracted from synchrotron SIS-18 at GSI with an incident energy 2.5 GeV impinges on a carbon target. The momenta deuterons emitted 0\ifmmode^\circ\else\textdegree\fi{} precisely fragment separator (FRS) operated as spectrometer. In contrast to theoretical predictions possible existence deeply bound...
We have measured the 3d→2p transition x rays of kaonic ^{3}He and ^{4}He atoms using superconducting transition-edge-sensor microcalorimeters with an energy resolution better than 6 eV (FWHM). determined energies to be 6224.5±0.4(stat)±0.2(syst) 6463.7±0.3(stat)±0.1(syst) eV, widths 2.5±1.0(stat)±0.4(syst) 1.0±0.6(stat)±0.3(stat) for ^{4}He, respectively. These values are nearly 10 times more precise in previous measurements. Our results exclude large strong-interaction shifts that suggested...
Excitation-energy spectra of $^{11}\mathrm{C}$ nuclei near the ${\ensuremath{\eta}}^{\ensuremath{'}}$-meson production threshold have been measured by missing-mass spectroscopy using $^{12}\mathrm{C}(p,d)$ reaction. A carbon target has irradiated with a 2.5 GeV proton beam supplied synchrotron SIS-18 at GSI to produce bound states in nuclei. Deuterons emitted ${0}^{\ensuremath{\circ}}$ reaction momentum analyzed fragment separator (FRS), used as high-resolution spectrometer. No distinct...
We observed the atomic $1s$ and $2p$ states of $\pi^-$ bound to ${}^{121}{\rm Sn}$ nuclei as distinct peak structures in missing mass spectra ${}^{122}{\rm Sn}(d,{}^3{\rm He})$ nuclear reaction. A very intense deuteron beam a spectrometer with large angular acceptance let us achieve potential discovery, which includes capability determining angle-dependent cross sections high statistics. The state Sn nucleus was for first time. binding energies widths pionic are determined found be...
In this paper, we discuss the recent finalized analyses by KLOE experiment at DAΦNE: CPT and Lorentz invariance test with entangled K 0 K0 pairs, precision measurement of branching fraction decay + → π -π (γ).We also present status an ongoing analysis aiming to precisely measure ± mass.
We have performed an inclusive spectroscopy of 122Sn(d, 3He) reaction near the pion emission threshold at incident energy Td = 250 MeV/nucleon. The first experiment aims as devloping high precision pionic atoms RI beam factory (RIBF) RIKEN, which leads to a new project, Atom Factory project (piAF) measure for wide range elements. report analysis status pilot experiment.
Abstract A new experimental method to search for the double Gamow–Teller giant resonance using charge exchange ($^{12}$C, $^{12}$Be(0$^{+}_{2}$)) reaction is proposed and applied, first time, a ${}^{48}$Ca target at 250 MeV/nucleon $^{12}$C primary beam RIKEN RI Beam Factory. The events with isospin- spin-flip in were selected by measuring decay $\gamma$-rays from ${}^{12}$Be(0$^{+}_{2}$). forward-peaking component measured double-differential cross sections was observed an integrated...
Tetraneutron ($^4n$) has come back in the limelight, because of recent observation a candidate resonant state at RIBF. We propose to investigate pion double charge exchange (DCX) reaction, i.e. $^4\mathrm{He}({\pi}^- , {\pi}^+)$, as an alternative way populate tetraneutron. An intense ${\pi}^-$ beam with kinetic energy ~850 MeV, much higher than that past experiments LAMPF and TRIUMF, will open up possibility improve experimental sensitivity formation cross section, which be smaller hitherto...
In order to investigate a possible mass reduction of an η′ meson at finite density, series missing-mass spectroscopy experiments η′-nucleus bound states with the 12C(p,d) reaction is planned GSI and FAIR. A semi-exclusive measurement tagging protons from two-body absorption (η′NN → NN) will be key feature in experiment Super-FRS
We performed a missing-mass spectroscopy experiment of the 12 C(p, d) reaction in order to search for η -mesic nuclei.Excitation spectrum 11 C around -meson production threshold was successfully obtained with high-statistical sensitivity and sufficiently good energy resolution.Since no peak structure associated formation nuclei observed, we set constraints on cross sections states -nucleus interaction.
We report the results of research on sensitivity observables deeply bound pionic atom to pion-nucleon sigma term σπN .We calculate uncertainties determining value sigmaπN with accurate data atoms expected be obtained at RI Beam Factory (RIBF), RIKEN.We find that energy gap 1s and 2p states, (Bπ(1s) -Bπ(2p)), width state for lighter Sn isotope are important precisely determine by taking into account errors experiments.topics
The spectroscopy of deeply bound pionic atoms provides a way to understand the restoration chiral symmetry breaking at finite density. We have been performing series experiments missing-mass (d,3He) reaction RIBF investigate several Sn isotopes. As first step, we conducted pilot experiment measure states 121Sn and successfully observed states. In addition RIBF, are planning in inverse kinematics feasible study by simulations. showed that using deuterium gaseous active target TPC silicon...
We plan a missing-mass spectroscopy experiment of η′ mesic nuclei with the 12C(p,d)η′⊗11C reaction to study in-medium properties meson. In nuclear medium, due restoration chiral symmetry, mass meson may be reduced, and bound states in nucleus exist. The will started at GSI 2.5 GeV proton beam using FRS as spectrometer continued Super-FRS FAIR. development Cherenkov detector an optics mode are described.