A5040878737- Quantum Chromodynamics and Particle Interactions
- Nuclear physics research studies
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- High-Energy Particle Collisions Research
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Advanced Chemical Physics Studies
- Quantum, superfluid, helium dynamics
- Advanced NMR Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Astronomical and nuclear sciences
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Medical Imaging Techniques and Applications
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Markov Chains and Monte Carlo Methods
- Neutrino Physics Research
- Advanced Data Storage Technologies
University of Massachusetts Boston
2023
Tohoku University
2011-2021
The Maria Sklodowska-Curie National Research Institute of Oncology
2019
Osaka University
1978-2011
Gifu University
2011
Akita University
2011
Czech Academy of Sciences, Nuclear Physics Institute
2011
National Institute of Technology, Ichinoseki College
2011
High Energy Accelerator Research Organization
2011
Institute of Particle and Nuclear Studies
2011
Data obtained by the associated production of \ensuremath{\Lambda} hypernuclei through (${\mathrm{\ensuremath{\pi}}}^{+}$,${\mathit{K}}^{+}$) reaction are presented for a wide range mass numbers. The special features which make this useful pointed out. is shown to be an excellent probe single-particle states, as demonstrated excitation deeply bound states interpreted weak coupling neutron-hole core. binding energies and ground-state cross sections...
Hypernuclear mass spectra of ${\mathrm{}}_{\mathrm{\ensuremath{\Lambda}}}^{10}$B, ${\mathrm{}}_{\mathrm{\ensuremath{\Lambda}}}^{12}$C, ${\mathrm{}}_{\mathrm{\ensuremath{\Lambda}}}^{28}$Si, ${\mathrm{}}_{\mathrm{\ensuremath{\Lambda}}}^{89}$Y, ${\mathrm{}}_{\mathrm{\ensuremath{\Lambda}}}^{139}$La, and ${\mathrm{}}_{\mathrm{\ensuremath{\Lambda}}}^{208}$Pb were measured by the (${\mathrm{\ensuremath{\pi}}}^{+}$,${\mathit{K}}^{+}$) reaction with an energy resolution 2 MeV (FWHM). The experiment...
An experiment with a newly developed high-resolution kaon spectrometer (HKS) and scattered electron novel configuration was performed in Hall C at Jefferson Lab (JLab). The ground state of neutron-rich hypernucleus, He 7 Lambda, observed for the first time (e,e'K+) reaction an energy resolution ~0.6 MeV. This is best reported to date hypernuclear spectroscopy. he Lambda binding supplies last missing information A=7, T=1 iso-triplet, providing new input charge symmetry breaking (CSB) effect...
Spectroscopy of a $^{10}_{\Lambda}$Be hypernucleus was carried out at JLab Hall C using the $(e,e^{\prime}K^{+})$ reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically designed for high resolution hypernuclear spectroscopy, used to obtain an energy spectrum with 0.78 MeV (FWHM). The well-calibrated present experiment $p(e,e^{\prime}K^{+})\Lambda,\Sigma^{0}$ reactions allowed us determine levels, and binding ground state peak (mixture 1$^{-}$ 2$^{-}$ states) obtained be...
We have studied the (pi(-),K+) reaction on a silicon target to investigate sigma-nucleus potential. The inclusive spectrum was measured at beam momentum of 1.2 GeV/c with an energy resolution 3.3 MeV (FWHM) by employing superconducting kaon spectrometer system. compared theoretical calculations within framework distorted-wave impulse approximation, which demonstrates that strongly repulsive potential nonzero size imaginary part reproduces observed spectrum.
In order to study the Sigma-nucleus optical potential, we measured inclusive (pi^-,K^+) spectra on medium-to-heavy nuclear targets: CH_2, Si, Ni, and Bi. The CH_2 target was used calibrate excitation energy scale by using elementary process p + pi^- -> K^+ Sigma^-, where C spectrum also extracted. calibration done with +-0.1 MeV precision. angular distribution of cross section measured, agreed well previous bubble chamber data, but better statistics, magnitudes sections were calibrated. All...
\ensuremath{\eta} mesons emitted from the photoproduction off protons were measured for $0.70\ensuremath{\leqslant}{E}_{\ensuremath{\gamma}}\ensuremath{\leqslant}1.15$ GeV. The $\ensuremath{\gamma}p\ensuremath{\rightarrow}\ensuremath{\eta}p$ reaction process was separated $\ensuremath{\pi}\ensuremath{\eta}p$ final state by momentum difference of ${E}_{\ensuremath{\gamma}}\ensuremath{\geqslant}930$ MeV. angular distributions obtained and excitation function are essentially in good agreement...
Since the pioneering experiment, E89-009 studying hypernuclear spectroscopy using $(e,e^{\prime}K^+)$ reaction was completed, two additional experiments, E01-011 and E05-115, were performed at Jefferson Lab. These later experiments used a modified experimental design, "tilt method", to dramatically suppress large electromagnetic background, allowed for substantial increase in luminosity. Additionally, new kaon spectrometer, HKS (E01-011), electron HES, splitting magnet added produce...
A 26-year-old man had a right infraspinatus muscle weakness and aching of the shoulder due to supra-scapular nerve entrapment confirmed by electromyography. MRI revealed well-defined area increased signal intensity over suprascapular notch. An ultrasonogram showed homogeneous hypoechogenic at base scapular spine. diagnosis was made ganglion compressing inferior branch nerve. After removal several ganglia, patient immediate pain relief, normal electromyographic findings were obtained 5 months...
Differential and total cross sections of the D(γ,η)pn reaction have been measured for photon energies between 600 1150 MeV. The data provide information γn →ηn above Eγ ≥ 800 section shows a narrow resonance structure peaked at = 1020 angular distribution coefficients together with are compared calculation isobar model by using impulse approximation. Although spin parity cannot be determined unambiguously, negative assignment gives better fit to data.
The total cross sections were measured for coherent double neutral-pion photoproduction on the deuteron at incident energies below 0.9 GeV first time. No clear resonance-like behavior is observed in excitation function Wγd=2.38–2.61 GeV, where d⁎(2380) dibaryon resonance COSY expected to appear. consistent with existing theoretical calculation this reaction. upper limit of section found be 0.034μb Wγd=2.37 (90% confidence level) γd→π0π0d
We have measured the cross section for quasielastic $1p$-shell proton knockout in ${}^{16}\mathrm{O}({e,e}^{\ensuremath{'}}p)$ reaction at $\ensuremath{\omega}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.439\mathrm{GeV}$ and ${Q}^{2}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.8(\mathrm{GeV}/c{)}^{2}$ missing momentum ${P}_{\mathrm{miss}}\ensuremath{\le}355\mathrm{MeV}/c$. extracted response functions ${R}_{L+TT}$, ${R}_{T}$, ${R}_{\mathrm{LT}}$, left-right asymmetry,...
Coherent double neutral-pion photoproduction on the deuteron, $\gamma{d}${$\to$}$\pi^0\pi^0{d}$, has been experimentally studied at incident photon energies ranging from 0.75 to 1.15 GeV. The total cross section as a function of $\gamma{d}$ center-of-mass energy shows resonance-like behavior, which peaks approximately 2.47 and 2.63 measured angular distribution deuteron emission is rather flat, cannot be reproduced by kinematics quasi-free $\pi^0\pi^0$ production with coalescence. In $\pi^0d...
Evidence for a modification of the ${\ensuremath{\rho}}^{0}$ mass in nuclear medium via ${}^{3}\mathrm{He}(\ensuremath{\gamma},{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}})X$ reaction is reported here. The tagged photon energies were mostly below production threshold on free nucleon, and bound nucleon's Fermi momentum was utilized to produce ${\ensuremath{\rho}}^{0}$. shift observed...
A spectroscopic study of the $_{\ensuremath{\Lambda}}^{12}\mathrm{C}$ hypernucleus by (${\ensuremath{\pi}}^{+}, {K}^{+}$) reaction has been performed using a new superconducting kaon spectrometer (INS-SKS) at KEK 12 GeV Proton Synchrotron with an energy resolution 2 MeV (FWHM). In addition to two prominent peaks which correspond $s$ and $p$ orbitals $\ensuremath{\Lambda}$ hyperon, for first time smaller were clearly observed excitation energies 2.6 6.9 MeV. These are interpreted as states...
The first $(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{p})$ polarization transfer measurements on a nucleus heavier than deuterium have been carried out at Jefferson Laboratory. Transverse and longitudinal components of the protons ejected in reaction ${}^{16}\mathrm{O}(\stackrel{\ensuremath{\rightarrow}}{e}{,e}^{\ensuremath{'}}\stackrel{\ensuremath{\rightarrow}}{p})$ were measured quasielastic perpendicular kinematics ${Q}^{2}$ 0.8...
We have measured lifetimes of $\ensuremath{\Lambda}$ hypernuclei over a broad mass range explicitly identifying hypernuclear production in the $({\ensuremath{\pi}}^{+}{,K}^{+})$ reaction. The obtained results are $\ensuremath{\tau}{(}_{\ensuremath{\Lambda}}^{12}\mathrm{C})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}231\ifmmode\pm\else\textpm\fi{}15\mathrm{ps}$,...
We have measured the energy spectra of pions and protons emitted in weak decay $^{\ensuremath{\Lambda}}_{12}\mathrm{C}$, $^{\ensuremath{\Lambda}}_{28}\mathrm{Si}$, $^{\ensuremath{\Lambda}}\mathrm{Fe}$ hypernuclei produced via $({\ensuremath{\pi}}^{+},{K}^{+})$ reaction. The widths ${\ensuremath{\pi}}^{\ensuremath{-}}$ mesonic $(\ensuremath{\Lambda}\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{\ensuremath{-}})$ nonmesonic $(\ensuremath{\Lambda}N\ensuremath{\rightarrow}NN)$ were extracted....