Tatsushi Shima
A5040485757- Nuclear Physics and Applications
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Gamma-ray bursts and supernovae
- Radiation Therapy and Dosimetry
- Quantum Chromodynamics and Particle Interactions
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Medical Imaging Techniques and Applications
- Cosmology and Gravitation Theories
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Astro and Planetary Science
- Atomic and Molecular Physics
- Stellar, planetary, and galactic studies
- Particle Accelerators and Free-Electron Lasers
- Nuclear Materials and Properties
Osaka University
2016-2025
Toranomon Hospital
2025
High Energy Accelerator Research Organization
2009-2023
University of Technology Malaysia
2018-2023
Seoul National University of Science and Technology
2023
Japan Atomic Energy Agency
2009-2022
The University of Tokyo
2022
Kyoto University
2005-2022
Japan Proton Accelerator Research Complex
2022
Nagoya University
2022
The M ajorana D emonstrator will search for the neutrinoless double-beta<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mo stretchy="false">(</mml:mo><mml:mi>β</mml:mi><mml:mi>β</mml:mi><mml:mfenced separators="|"><mml:mrow><mml:mn fontstyle="italic">0</mml:mn><mml:mi>ν</mml:mi></mml:mrow></mml:mfenced><mml:mo stretchy="false">)</mml:mo></mml:math>decay of isotope<mml:math id="M2"/>Ge with a mixed array enriched and natural germanium detectors. observation this rare...
Abstract JSNS2 (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) is an experiment that searching for sterile neutrinos via the observation of $\bar{\nu }_{\mu } \rightarrow \bar{\nu }_e$ appearance oscillations using with muon decay-at-rest. For this search, rejecting cosmic-ray-induced neutron events by Pulse Shape Discrimination (PSD) essential because detector located above ground, on third floor building. We have achieved 94.95±0.15% rejection while keeping 92.82±1.77%...
Fragility fractures of the pelvis are low-energy pelvic ring commonly occurring in older adults. Early diagnosis fragility is important because possibility fracture progression and deterioration. Herein, we report imaging characteristics three patients that resulted delayed diagnoses discuss ways to improve diagnostic accuracy. We reviewed images Japanese with (one male, two females, aged 74–89 years), whose were confirmed by orthopedic trauma surgeons after initial treatments completed....
The energy dependence of the spin-parallel and spin-antiparallel cross sections for ${p}_{\ensuremath{\uparrow}}+{p}_{\ensuremath{\uparrow}}\ensuremath{\rightarrow}p+p$ at ${90\mathrm{\ifmmode^\circ\else\textdegree\fi{}}}_{\mathrm{c}.\mathrm{m}.}$ was measured beam momenta between 6 12.75 GeV/c. ratio ${(\frac{d\ensuremath{\sigma}}{\mathrm{dt}})}_{\mathrm{parallel}}:{(\frac{d\ensuremath{\sigma}}{\mathrm{dt}})}_{\mathrm{antiparallel}}$ 90\ifmmode^\circ\else\textdegree\fi{} is about 1.2 up to...
A high-resolution measurement of inelastic proton scattering off $^{90}\mathrm{Zr}$ near 0\ifmmode^\circ\else\textdegree\fi{} was performed at 295 MeV with a focus on pronounced strength previously reported in the low-energy tail giant dipole resonance. forest fine structure observed excitation energy region 7--12 MeV. multipole decomposition analysis angular distribution for carried out using ECIS95 distorted-wave Born approximation code Hartree-Fock plus random-phase model $E1$ and $M1$...
The gamma strength function and level density of ${1}^{\ensuremath{-}}$ states in $^{96}\mathrm{Mo}$ have been extracted from a high-resolution study the ($\stackrel{\ensuremath{\rightarrow}}{p}$, ${\stackrel{\ensuremath{\rightarrow}}{p}}^{\ensuremath{'}}$) reaction at 295 MeV extreme forward angles. By comparison with compound nucleus $\ensuremath{\gamma}$ decay experiments, this allows test generalized Brink-Axel hypothesis energy region pygmy dipole resonance. is commonly assumed...
Photodisintegration of $^{9}\mathrm{Be}$ through the $1/{2}^{+}$ state near neutron threshold and cluster dipole resonance below giant was measured with quasi-monochromatic $\ensuremath{\gamma}$-ray beams produced in inverse Compton scattering laser photons. The cross section for is revisited, being consistent 2001 data. sum-rule which however degenerates two-body $(n\text{\ensuremath{-}}^{8}\mathrm{Be})$ three-body...
Using γ-ray beams produced in the inverse Compton scattering between CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> laser photons and relativistic electrons, we have calibrated electron beam energies nominal energy range 550-974 MeV at synchrotron radiation facility New-SUBARU. The Compton-scattering (LCS) were from 561 to 1728 keV detected with a high-purity germanium detector. determined by reproducing full peaks of Monte Carlo...
In this document, the technical details of JSNS$^2$ (J-PARC Sterile Neutrino Search at J-PARC Spallation Neutron Source) experiment are described. The search for sterile neutrinos is currently one hottest topics in neutrino physics. aims to existence oscillations with $\Delta m^2$ near 1 eV$^2$ Materials and Life Science Experimental Facility (MLF). A MW beam 3 GeV protons incident on a spallation neutron target produces an intense from muon decay rest. Neutrinos come predominantly $\mu^+$...
We have performed for the first time simultaneous measurement of two-body and three-body photodisintegration cross sections $^{4}\mathrm{He}$ in energy range from 21.8 to 29.8 MeV using monoenergetic pulsed photons a 4\ensuremath{\pi} projection chamber containing gas as an active target event-by-event mode. The photon beam was produced via Compton backscattering laser with high-energy electrons. $^{4}\mathrm{He}$($\ensuremath{\gamma},p$)$^{3}\mathrm{H}$...
Accelerating polarized protons to 22 GeV/c at the Brookhaven Alternating Gradient Synchro- tron required both extensive hardware modifications and a difficult commissioning process. We had overcome 45 strong depolarizing resonances maintain polarization up in this strong-focusing synchrotron. At 18.5 we measured analyzing power A spin-spin correlation parameter Ann large- P2⊥ proton-proton elastic scattering, using proton beam target. also obtained high-precision measurement of P2⊥=0.3...
Ordinary muon capture (OMC) on enriched $^{100}\mathrm{Mo}$ isotopes was studied for the first time to investigate neutrino nuclear responses neutrinoless double-$\ensuremath{\beta}$ decays and supernova interactions. Muon proceeds mainly as $^{100}\mathrm{Mo}(\ensuremath{\mu},xn)^{100\ensuremath{-}x}\mathrm{Nb}$ with $x$ being number of neutrons emitted from negative capture. The Nb isotope mass distribution obtained by measuring delayed $\ensuremath{\gamma}$ rays radioactive...
We describe an experimental search for deviations from the inverse-square law of gravity at nanometer length scale using neutron scattering noble gases on a pulsed slow beam line. By measuring momentum transfer (q) dependence differential cross section xenon and helium comparing to their well-known analytical forms, we place upper bound strength new interaction as function λ which improves upon previous results in region λ<0.1 nm, remains competitive larger-λ region. A pseudoexperimental...
The PICO-LON project aims at search for cold dark matter by means of highly radio-pure and large volume NaI(Tl) scintillator. NaI powder was purifed chemical processing to remove lead isotopes selecting a high purity graphite crucible. concentrations radioactive impurities $^{226}$Ra $^{228}$Th were effectively reduced 58$\pm$4 $\mu$Bq/kg 1.5$\pm$1.9 $\mu$Bq/kg, respectively. It should be remarked that the concentration $^{210}$Pb, which is crucial sensitivity matter, 24$\pm$2 $\mu$Bq/kg....
Photoneutron cross sections were measured for five stable Nd isotopes, ${}^{143,144,145,146,148}\mathrm{Nd}$, near neutron threshold with highly monochromatic laser-Compton scattering $\ensuremath{\gamma}$ rays. The photoneutron data compared the calculations performed talys reaction code inputs of Skyrme Hartree-Fock-Bogoliubov (HFB) plus quasi-particle random phase approximation (QRPA) model and axially symmetric deformed Gogny HFB QRPA $E1$ $\ensuremath{\gamma}$-ray strength. Using...
Abstract Highly radiopure NaI(Tl) was developed to search for particle candidates of dark matter. Optimized methods were combined reduce various radioactive impurities. $^{40}$K effectively reduced by the recrystallization method. The progenies decay chains uranium and thorium appropriate resins. concentration natural potassium in crystal 20 ppb. Concentrations alpha-ray emitters successfully resin selection. present concentrations series $^{226}$Ra $1.2\pm1.4$$\mu$Bq/kg $13\pm4$$\mu$Bq/kg,...
Double beta decays (ββ) from the 0 + ground state in 116 Cd to Sn were studied by means of ELEGANT V. A finite half-life for two-neutrino ββ(2νββ) and an upper limit on neutrinoless one (0νββ) obtained as T 2ν 1/2 =2.6 +0.9 -0.5 ×10 19 y 0ν >6.3×10 21 (68% C.L.), respectively. The nuclear matrix element M ββ was deduced 0.069±0.009 units ( m e c 2 ) -1 . This supports universal quenching 2νββ rates this mass region, which is consistent with that previously measured 100 Mo.