A5028498890- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Particle accelerators and beam dynamics
- High-Energy Particle Collisions Research
- Nonlinear Waves and Solitons
- Gyrotron and Vacuum Electronics Research
- Atomic and Molecular Physics
- Quantum, superfluid, helium dynamics
- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Numerical methods for differential equations
- Differential Equations and Numerical Methods
- Nonlinear Photonic Systems
- High-pressure geophysics and materials
- Advanced Chemical Physics Studies
- Quantum chaos and dynamical systems
- Fractional Differential Equations Solutions
- Astronomical and nuclear sciences
- Advanced Mathematical Physics Problems
- Cold Atom Physics and Bose-Einstein Condensates
- Astro and Planetary Science
- Nonlinear Dynamics and Pattern Formation
- Magnetic and Electromagnetic Effects
Osaka University of Economics and Law
2023-2025
University of Tennessee at Knoxville
2017-2024
University of Oxford
2017-2024
Kansai University
2019-2023
The University of Tokyo
2008-2022
Tokyo Institute of Technology
2017-2019
Czech Technical University in Prague
2019
Shibaura Institute of Technology
2017-2019
University of Tsukuba
2017
GSI Helmholtz Centre for Heavy Ion Research
2009-2013
We present the nuclear matrix element for neutrinoless double-beta decay of ^{48}Ca based on large-scale shell-model calculations including two harmonic oscillator shells (sd and pf shells). The excitation spectra ^{48}Ti, two-neutrino are reproduced in good agreement to experimental data. find that is enhanced by about 30% compared pf-shell calculations. This reduces lifetime almost a factor 2. matrix-element increase mostly due pairing correlations associated with cross-shell sd-pf...
A gyrotron with an axis-encircling electron beam is capable of high-frequency operation, because the high-beam efficiency kept even at high harmonics cyclotron frequency. We have designed and constructed such a permanent magnet. The has already operated successfully third, fourth, fifth harmonics. frequencies are 89.3, 112.7, 138 GHz, respectively, corresponding cavity modes TE/sub 311/, 411/, 511/. magnet system quite novel consists many elements made NbFeB additional coils for controlling...
Charge equilibration between two colliding nuclei can take place in the early stage of heavy-ion collisions. A basic mechanism charge is presented terms extension single-particle motion from one nucleus to other, which upper energy limit bombarding introduced for significant equilibration. The formula this presented, and compared various experimental data. It examined also by comparison three-dimensional time-dependent density functional calculations. suppression equilibration, appears...
In this study, we calculate the nuclear matrix elements (NMEs) for light neutrino-exchange mechanism of neutrinoless double beta decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) $^{124}\mathrm{Sn}$ within framework interacting shell model, using effective model Hamiltonian GCN5082. The NMEs are calculated employing both closure and nonclosure approaches. For intermediate nucleus $^{124}\mathrm{Sb}$, effects energy 100 states each ${J}_{k}^{\ensuremath{\pi}}={0}^{+}$ to...
This paper represents a continuation of our investigation into the limitations on total, proton, and neutron particle number densities, as well asymmetry proton density distributions achievable in central heavy-ion collisions. We explore these aspects at low medium energies within framework Boltzmann-Uhlenbeck-Uehling (pBUU) transport time-dependent Hartree-Fock (TDHF) models. Previous studies, focusing symmetric asymmetric collisions Ca Sn nuclei [1], initial results Pb-nuclei [2],...
The tensor and spin-orbit forces contribute essentially to the formation of spin mean field, give rise same dynamical effect, namely polarization. In this paper, based on time-dependent density functional calculations, we show that force, which usually acts like a small correction becomes more important in heavy-ion reactions effect increases with mass system.
Propagation of non-topological soliton in many-nucleus systems is studied based on time-dependent density functional calculations with focusing mass and energy dependence. The dispersive property the nonlinearity system, which are inherently included nuclear functional, essential factors to form a soliton. On other hand propagation prevented by charge equilibration dynamics, competition possibly appears. In this article, energy-dependence two competitive factors, concept conditional recovery...
Special experiments devoted to studying hysteresis in gyrotron oscillators have been performed for the first time. Clear hysteresis-like effects with respect variation of cathode voltage observed mode competition scenario Forschungszentrum Karlsruhe coaxial [B. Piosczyk et al., IEEE Trans. Plasma Sci. 30, 818 (2002)] and magnetic field a single-mode operation Fukui IV [T. Idehara Int. J. Infrared Millim. Waves 19, 793 (1998)]. The phenomena are explained theoretically.
Background: The distribution of protons and neutrons in the matter created heavy-ion collisions is one main points interest for collision physics, especially at supranormal densities. These distributions are basis predictions density dependence symmetry energy range that can be achieved a given colliding system. We report results first systematic simulation proton neutron central within beam ${E}_{\mathrm{beam}}\ensuremath{\le}800\phantom{\rule{0.28em}{0ex}}\mathrm{MeV}/\mathrm{nucl}$....
We have proposed in a series of previous articles method to determine the effective axial-vector current coupling and strength isoscalar proton-neutron pairing interaction for calculating nuclear matrix elements neutrinoless double-$\ensuremath{\beta}$ ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) decay by quasiparticle random-phase approximation (QRPA). The combination these two parameters has had an uncertainty QRPA approach, but now this is removed introducing mathematical...
The stable existence of rod-shaped structures in highly excited states $^{24}\mathrm{Mg}$ is studied based on a systematic cranked Hartree-Fock calculation with various Skyrme-type interactions. Its stability examined by allowing the transition clusterlike structure to shell-model-like structure. Especially, state exposed two major instabilities: bending motion, which main path for low-lying states, and spin-orbit interaction, driving force break $\ensuremath{\alpha}$ clusters enhance...
We systematically explore the relative impact of Coulomb interaction and nuclear symmetry energy on proton neutron density distributions in 212Pb + 208Pb, 132Sn 124Sn 54Ca 48Ca central collisions at beam energies below 800 MeV/A. The Boltzmann-Uhlenbeck-Uehling (pBUU) transport Time-Dependent-Hartree-Fock (TDHF) frameworks with SV-bas SV-sym34 Skyrme parametrizations are employed. Maximum total particle number proton-neutron (isospin) asymmetry have been calculated as a function energy,...
The Windkessel model, which is known as a successful model for explaining the hemodynamic circulation, mathematical with direct correspondence electric circuit. We propose theoretical intracranial aneurysm based on Windkessel-type steady blood flow. Intracranial aneurysms are well vascular lesions, cause subarachnoid hemorrhages. Since an end-sack formed vessel, it functions unusual path that has characteristic features such reservoir and bottle neck orifice. simulate by circuit consisting...
A logarithm representation of evolution operators is defined. Generators invertible families are characterized by the representation. In this article, using representation, a concept without satisfying semigroup property introduced. conclusion existence alternative infinitesimal generator clarified.
A logarithm representation of operators is introduced as well a concept pre-infinitesimal generator. Generators invertible evolution families are represented by the representation, and set shown to be associated with analytic semigroups. Consequently generally-unbounded infinitesimal generators characterized convergent power series representation.
The soliton existence in sub-atomic many-nucleon systems is discussed. In many nucleon dynamics represented by the nuclear time-dependent density functional formalism, much attention paid to energy and mass dependence of existence. conclusion, clarified if temperature system from 10 30 MeV. With respect $^{4}$He $^{16}$O suggested be candidates for self-bound states exhibiting property soliton.
Neutrinoless double beta decay is a pivotal weak nuclear process that holds the potential to unveil Majorana nature of neutrinos and predict their absolute masses. In this study, we delve into examining impact spin-dependent short-range correlations (SRCs) on matrix elements (NMEs) for light neutrino-exchange mechanism in neutrinoless (0νββ) 48Ca, employing an extensive interacting shell model. All computations are performed effective model Hamiltonian GXPF1A, encompassing entire fp space...
Operator representation of Cole-Hopf transform is obtained based on the logarithmic infinitesimal generators. For this purpose relativistic formulation abstract evolution equation introduced. Even independent spatial dimension, generalized to a between linear and nonlinear equations defined in Banach spaces. In conclusion role operator its generator understood context generating semigroup.
The $\lambda$ and $m_{\beta\beta}$ mechanisms of neutrinoless double beta decay ($0\nu\beta\beta$) occur with light neutrino exchange via $W_L-W_R$, $W_L-W_L$ mediation, respectively. In the present study, we calculate nuclear matrix elements (NMEs) for $0\nu\beta\beta$, which has origin in left-right symmetric model right-handed gauge boson at TeV scale. NMEs are calculated one $0\nu\beta\beta$ decaying isotope $^{48}$Ca interacting shell-model using GXPF1A effective interaction $pf$-shell....
The operator algebra is introduced based on the framework of logarithmic representation infinitesimal generators. In conclusion a set generally-unbounded generators characterized as module over Banach algebra.
Large-scale shell model calculations including two major shells are carried out, and the ingredients of nuclear matrix element for two-neutrino double beta decay investigated. Based on comparison between accounting only one ($pf$-shell) those ($sdpf$-shell), effect due to excitation across is quantitatively evaluated.