T. Kawabata
A5037396755- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Particle physics theoretical and experimental studies
- Advanced NMR Techniques and Applications
- High-Energy Particle Collisions Research
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Advanced Chemical Physics Studies
- Astronomical and nuclear sciences
- Nuclear reactor physics and engineering
- Neutrino Physics Research
- X-ray Spectroscopy and Fluorescence Analysis
- Radiation Detection and Scintillator Technologies
- Particle accelerators and beam dynamics
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Muon and positron interactions and applications
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Rare-earth and actinide compounds
- Cold Atom Physics and Bose-Einstein Condensates
- Inorganic Fluorides and Related Compounds
The University of Tokyo
2009-2025
Kyoto University
2011-2024
Osaka University
2011-2024
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
2023
Kagoshima Medical Center
2022
Pandora (United States)
2022
Kanazawa University
2022
Nagoya University
2020
University of Notre Dame
2010-2016
RIKEN
2004-2015
A benchmark experiment on 208Pb shows that polarized proton inelastic scattering at very forward angles including 0{\deg} is a powerful tool for high-resolution studies of electric dipole (E1) and spin magnetic (M1) modes in nuclei over broad excitation energy range to test up-to-date nuclear models. The extracted E1 polarizability leads neutron skin thickness r_skin = 0.156+0.025-0.021 fm derived within mean-field model [Phys. Rev. C 81, 051303 (2010)], thereby constraining the symmetry its...
The strength distributions of the giant monopole resonance (GMR) have been measured in even-A Sn isotopes (A=112-124) with inelastic scattering 400-MeV alpha particles angular range 0 degrees -8.5 . We find that experimentally observed GMR energies are lower than values predicted by theoretical calculations reproduce 208Pb and 90Zr very well. From data, a value Ktau = -550 +/- 100 MeV is obtained for asymmetry term nuclear incompressibility.
Inelastic scattering from ${}^{12}$C has been measured at extremely forward angles including 0 ${}^{\ensuremath{\circ}}$ using 386 MeV $\ensuremath{\alpha}$ particles to study the $\ensuremath{\alpha}$-cluster states around ${E}_{x}$ $\ensuremath{\sim}$ 10 MeV, especially 2${}^{+}$ state predicted by model. We have analyzed ($\ensuremath{\alpha}$,${\ensuremath{\alpha}}^{\ensuremath{'}}$) cross-section data both peak-fitting and multipole decomposition techniques. A ${E}_{x}=$ 9.84...
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.
We have investigated the isoscalar giant resonances in Sn isotopes using inelastic scattering of 386-MeV alpha-particles at extremely forward angles, including 0deg. obtained completely "background-free inelastic-scattering spectra for over angular range 0deg--9deg and up to an excitation energy 31.5 MeV. The strength distributions various multipoles were extracted by a multipole decomposition analysis based on expected respective multipoles. find that centroid energies monopole resonance...
We perform the first direct mass measurements of neutron-rich calcium isotopes beyond neutron number 34 at RIKEN Radioactive Isotope Beam Factory by using time-of-flight magnetic-rigidity technique. The atomic excesses ^{55-57}Ca are determined for time to be -18650(160), -13510(250), and -7370(990) keV, respectively. examine emergence magicity N=34 based on new masses. masses provide experimental evidence appearance a sizable energy gap between 2p_{1/2} 1f_{5/2} orbitals in ^{54}Ca,...
The electric dipole strength distribution in 120Sn between 5 and 22 MeV has been determined at RCNP Osaka from a polarization transfer analysis of proton inelastic scattering E_0 = 295 forward angles including 0{\deg}. Combined with photoabsorption data an polarizability \alpha_D(120Sn) 8.93(36) fm^3 is extracted. as isovector observable par excellence carries direct information on the nuclear symmetry energy its density dependence. correlation new value well established \alpha_D(208Pb)...
The cluster structures of the excited states in $^{11}$B are studied by analyzing isoscalar monopole and quadrupole strengths $^{11}$B($d$,$d'$) reaction at $E_d=200$ MeV. excitation compared with predictions shell-model antisymmetrized molecular-dynamics (AMD) calculations. It is found that large strength for $3/2^-_3$ state $E_x=8.56$ MeV well described AMD calculation an evidence a developed $2\alpha+t$ structure.
The double-differential cross sections for the Ca48(p,n) and Ti48(n,p) reactions were measured at 300 MeV. A multipole decomposition technique was applied to spectra extract Gamow-Teller (GT) components. integrated GT strengths up an excitation energy of 30 MeV in Sc48 are 15.3±2.2 2.8±0.3 (p,n) (n,p) spectra, respectively. In additional found above 8 where shell models within fp shell-model space predict almost no strengths, suggesting that present description nuclear matrix element...
Scattering of protons several hundred MeV is a promising new spectroscopic tool for the study electric dipole strength in nuclei. A case 208Pb shows that at very forward angles J^pi = 1- states are strongly populated via Coulomb excitation. separation from nuclear excitation other modes achieved by multipole decomposition analysis experimental cross sections based on theoretical angular distributions calculated within quasiparticle-phonon model. The B(E1) transition distribution extracted...
The 12C excitation energy spectra populated in both proton and α-particle inelastic scattering measurements are examined. data indicate the existence of a 2+ state at Ex=9.75(0.15) MeV with width 750(150) keV. It is believed that this corresponds to 7.65 MeV, 0+, Hoyle state, which acts as main path by carbon synthesized stars. A simultaneous R-matrix analysis two sets indicates possesses very large α-reduced width, approaching Wigner limit. This would associated highly clustered structure....
The electric dipole strength in 120Sn has been extracted from proton inelastic scattering experiments at E_p = 295 MeV and forward angles including 0 degree. Below neutron threshoild it differs the results of a 120Sn(gamma,gamma') experiment peaks an excitation energy 8.3 MeV. total corresponds to 2.3(2)% energy-weighted sum rule is more than three times larger what observed with (gamma,gamma') reaction. This implies strong fragmentation E1 and/or small ground state branching ratios excited...
The cluster structure of the neutron-rich isotope ^{10}Be has been probed via (p,pα) reaction at 150 MeV/nucleon in inverse kinematics and quasifree conditions. populated states ^{6}He residues were investigated through missing mass spectroscopy. triple differential cross section for ground-state transition was extracted angle pairs (θ_{p},θ_{α}) compared to distorted-wave impulse approximation calculations performed a microscopic framework using successively Tohsaki-Horiuchi-Schuck-Röpke...
The systematic behavior of the isoscalar giant dipole resonance (ISGDR) in $^{90}\mathrm{Zr}$, $^{116}\mathrm{Sn}$, $^{144}\mathrm{Sm}$, and $^{208}\mathrm{Pb}$ is studied with inelastic $\ensuremath{\alpha}$ scattering at ${E}_{\ensuremath{\alpha}}=386\phantom{\rule{0.3em}{0ex}}\mathrm{MeV}$. Multipole-decomposition analysis applied to extract excitation strengths resonances from $(\ensuremath{\alpha},{\ensuremath{\alpha}}^{\ensuremath{'}})$ differential cross sections...
It is shown via a study on $^{26}\mathrm{Mg}$ target that the ($t$,$^{3}\mathrm{He}$) reaction at 115 MeV/nucleon an accurate probe for extracting Gamow-Teller transition strengths. To do so, data are complemented by results from $^{26}\mathrm{Mg}$($^{3}\mathrm{He}$, $t$) 140 allows comparison of $T=2$ analog states excited mirror reactions. Extracted strengths $^{26}\mathrm{Mg}$($t$,$^{3}\mathrm{He}$) and compared with those $^{26}\mathrm{Mg}$($d$,$^{2}\mathrm{He}$)...
Cross sections and analyzing powers for proton elastic scattering from $^{116,118,120,122,124}\mathrm{Sn}$ at 295 MeV have been measured a momentum transfer of up to about 3.5 fm${}^{\ensuremath{-}1}$ deduce systematic changes the neutron density distribution. We tuned relativistic Love-Franey interaction explain nucleus whose distribution is well known. Then, we applied this distributions tin isotopes. The result our analysis shows clear behavior gradual increase in skin thickness isotopes...
The differential cross sections and vector analyzing powers for nd elastic scattering at En=248 MeV were measured 10°–180° in the center-of-mass (c.m.) system. To cover wide angular range, experiments performed separately by using two different setups forward backward angles. data are compared with theoretical results based on Faddeev calculations realistic nucleon-nucleon (NN) forces such as AV18, CD Bonn, Nijmegen I II, their combinations three-nucleon (3NFs), Tucson-Melbourne 99 (TM99),...
The incompressibility of infinite nuclear matter (𝐾∞) is a parameter in the description equation state that governs energy cost associated with density oscillations near saturation density. most direct experimental method for studying this property to probe isoscalar giant monopole resonance (ISGMR) finite nuclei. This paper explores use 6Li as study ISGMR several stable nuclei: 58Ni, 90Zr, 116Sn, and 208Pb, complementary using inelastic scattering 𝛼 particles, which has been used great...
We have extracted the nuclear level density of ${}^{128}$Te from a $(\mathrm{p},\mathrm{p} '\gamma)$ scattering experiment using large-volume \labr\ and \cebr\ detectors ELI-NP at 9~MV Tandem facilities IFIN-HH. The decay data were normalised photonuclear data, resulting in densities without intrinsic model dependencies constant temperature or Fermi gas models. measured follows closely between expectations these two models, but we observe clear divergence microscopic based on Skyrme force.