A5053892625- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Nuclear Physics and Applications
- Advanced NMR Techniques and Applications
- Advanced Chemical Physics Studies
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Astronomical and nuclear sciences
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Astro and Planetary Science
- Medical Imaging Techniques and Applications
- Inorganic Fluorides and Related Compounds
- High-Energy Particle Collisions Research
- Superconducting Materials and Applications
- Radiation Therapy and Dosimetry
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Superconductivity in MgB2 and Alloys
- X-ray Diffraction in Crystallography
- Boron Compounds in Chemistry
- Radiopharmaceutical Chemistry and Applications
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
National Institute of Technology, Matsue College
2014-2025
National Institute of Technology, Kagoshima College
2024-2025
National Institute of Technology, Gifu College
2024
RIKEN Nishina Center
2024
Yokohama National University
2017-2018
Kyoto University
2008-2017
National Institute of Technology, Ichinoseki College
2013-2014
University of Tsukuba
2012-2013
National Institutes for Quantum Science and Technology
2008
Structures of excited states in $^{14}\mathrm{C}$ are investigated with a method $\ensuremath{\beta}$-$\ensuremath{\gamma}$ constraint antisymmetrized molecular dynamics combination the generator coordinate method. Various developed $3\ensuremath{\alpha}$-cluster core structures suggested positive- and negative-parity states. In positive-parity states, triaxial deformed linear-chain found to construct bands. Interestingly, $^{10}\mathrm{Be}$$+\ensuremath{\alpha}$ correlation is cluster above...
We propose a new method of the β−γ constraint for quadrupole deformation in antisymmetrized molecular dynamics (AMD) to describe various cluster and shell-model structures ground excited states light nuclei. apply this N = 6 isotones, 10Be, 12C, 9Li, 11B, find as functions parameters, β γ. In these nuclei, shell-model-like appear small region, while develop well large region where geometric configurations clusters are obtained depending on γ parameter. For 10Be we superpose basis AMD wave by...
We present a new picture that the $\alpha$-linear-chain structure for ${^{12}{\rm C}}$ and ${^{16}{\rm O}}$ has one-dimensional $\alpha$ condensate character. The wave functions of linear-chain states which are described by superposing large number Brink have extremely overlaps nearly $100\%$ with single Tohsaki-Horiuchi-Schuck-R\"opke (THSR) functions, were proposed to describe condensed "gas-like" states. Although this is different from conventional idea spatial localization clusters,...
The clustering of $\ensuremath{\alpha}$ particles in atomic nuclei results the self-organization various geometrical arrangements at femtometer scale. one-dimensional alignment multiple is known as linear-chain structure, evidence which has been highly elusive. We show via resonant elastic and inelastic scattering a radioactive $^{10}\mathrm{Be}$ beam that excited states neutron-rich nucleus $^{14}\mathrm{C}$ agree with recent predictions structure based on an antisymmetrized molecular...
It is a well-known fact that cluster of nucleons can be formed in the interior an atomic nucleus, and such clusters may occupy molecular-like orbitals, showing characteristics similar to normal molecules consisting atoms. Chemical having linear alignment are commonly seen nature, as carbon dioxide. A nuclear clusters, referred linear-chain state (LCCS), has been studied since 1950s, however, up now there no clear experimental evidence demonstrating existence state. Recently, it was proposed...
Structures of excited states in ${}^{11}$B are investigated with a method $\ensuremath{\beta}$-$\ensuremath{\gamma}$ constraint antisymmetrized molecular dynamics combination the generator coordinate method. Various developed cluster core structures suggested positive- and negative-parity states. For states, we suggest band $2\ensuremath{\alpha}$ $+$ $t$ structure. This starts from $3/{2}_{3}^{\ensuremath{-}}$ state can correspond to experimental observed recently. In positive-parity two...
We develop a new formalism to treat nuclear many-body systems using the bare nucleon–nucleon interaction. It has become evident that tensor interaction plays an important role in due of pion strongly interacting systems. take antisymmetrized molecular dynamics (AMD) as basic framework and add correlation operator acting on AMD wave function concept tensor-optimized shell model. demonstrate systematical straightforward formulation utilizing Gaussian integration differentiation method...
To clarify the effects of $\ensuremath{\alpha}$-cluster breaking on $3\ensuremath{\alpha}$-cluster structures in $^{12}\mathrm{C}$, we investigate $^{12}\mathrm{C}$ using a hybrid model that combines Brink-Bloch cluster with ${p}_{3/2}$ subshell closure wave function. We have found caused by spin-orbit force significantly changes excited ${0}^{+}$ states through orthogonality to lower states. Spatially developed components ${0}_{2}{}^{+}$ state are reduced. The ${0}_{3}{}^{+}$ from vibration...
We study the tensor-optimized antisymmetrized molecular dynamics (TOAMD) as a successive variational method in many-body systems with strong interaction for nuclei. In TOAMD, correlation functions tensor force and short-range repulsion their multiples are operated to AMD state wave function. The total function is expressed sum of all components space can be increased successively multiple achieve convergence. All necessary matrix elements operators, consisting Hamiltonian, analytically using...
We investigate the linear-chain structures in highly excited states of $^{14}$C using a generalized molecular orbital model, by which we incorporate an asymmetric configuration three $\alpha$ clusters states. By applying this model to system, study $^{10}$Be+$\alpha$ correlation state $^{14}$C. To clarify origin state, analyze linear $3\alpha$ and $3\alpha+n$ systems similar way. find that 3$\alpha$ system prefers 2$\alpha+\alpha$ configuration, whose is many body incorporated parity...
We propose an improved version of the antisymmetrized quasicluster model (AQCM) to describe a smooth transition from $\ensuremath{\alpha}$-cluster wave function $jj$-coupling shell and apply it ground state ${}^{12}$C. The cluster-shell in ${}^{12}$C is characterized AQCM by only two parameters: $R$ representing distance between $\ensuremath{\alpha}$ clusters center mass $\ensuremath{\Lambda}$ describing break clusters. optimal for intermediate three-$\ensuremath{\alpha}$ cluster with...
Cluster states in $^9$Li are investigated with calculations of a $^6$He-$t$ cluster model. Results suggest near the threshold energy. These construct $K^\pi=1/2^-$ band and their neutron configuration is similar to that $K^\pi=0^+_2$ $^{10}$Be.
Tensor-optimized antisymmetrized molecular dynamics (TOAMD) is the basis of successive variational method for nuclear many-body problem. We apply TOAMD to finite nuclei be described by central interaction with strong short-range repulsion, and compare results unitary correlation operator (UCOM). In TOAMD, pair-type functions their multiple products are operated AMD wave function. show using Malfliet-Tjon potential containing repulsion. Adding double in binding energies converged quickly...
We developed a new variational method for tensor-optimized antisymmetrized molecular dynamics (TOAMD) nuclei. In TOAMD, the correlation functions tensor force and short-range repulsion are introduced used in power series form of wave function, which is different from Jastrow method. Here, nucleon pairs correlated multi-steps with forms, while they only once including all Each function every term independently optimized variation total energy TOAMD. For $s$-shell nuclei using nucleon-nucleon...
The antisymmetrized quasi-cluster model (AQCM) is a method to describe transitions from the α cluster wave functions jj-coupling shell functions. In this model, cluster–shell transition characterized by only two parameters: R representing distance between clusters and Λ describing breaking of clusters. contribution spin–orbit interaction, very important in can be taken into account starting with function. article we show generality AQCM extending application heavier regions: various 4N...
Herein, we investigated the channel coupling (CC) effect on elastic scatterings of lithium (Li) isotopes ($A=6$--9) for $^{12}\mathrm{C}$ and $^{28}\mathrm{Si}$ targets at $E/A=50$--60 MeV. The wave functions Li were obtained using stochastic multi-configuration mixing method based microscopic-cluster model. proton radii $^{7}\mathrm{Li}$, $^{8}\mathrm{Li}$, $^{9}\mathrm{Li}$ nuclei became smaller as number valence neutrons increased. in $^{8}\mathrm{Li}$ exhibited a glue-like behavior,...
Background: Direct evidence of the $\ensuremath{\alpha}\text{-cluster}$ manifestation in bound states has not been obtained yet, although a number experimental studies were carried out to extract information clustering. In particular conventional analyses $\ensuremath{\alpha}\text{-transfer}$ reactions, there exist few significant problems on reaction models, which are insufficient qualitatively discuss cluster structure.Purpose: We aim verify structure from observables. As first...
We propose a simple method to approximately evaluate reduced width amplitude (RWA) of two-body spinless cluster channel using the norm overlap with Brink-Bloch wave function at radius. The applicability present approximation is tested for $^{16}$O+$\alpha$ in $^{20}$Ne as well $\alpha$+$\alpha$ $^8$Be. found be reasonable RWA states near threshold energy and it useful estimate $\alpha$-decay resonance states. also applied $^9$Li, partial decay $^6$He($0^+_1$)+$t$ discussed.
We formulate the "tensor-optimized high-momentum antisymmetrized molecular dynamics (TO-HMAMD)" framework for ab initio calculations of nuclei by hybridizing tensor-optimized (TO-) and (HM-) AMD approaches. This hybrid approach has advantages in both analytical simplicity numerical efficiency comparing with other AMD-based methods which treat bare interaction, especially heavier nuclear systems. In this work, $s$-shell nucleus $^{4}$He is calculated TO-HMAMD including up to double product...
The low-lying states of the ${}^{9}$Li nucleus are investigated with a unified framework microscopic structure and reaction models. In model, wave function is fully antisymmetrized described as an $\ensuremath{\alpha}$+$t$+$n$+$n$ four-body system, 1/2${}^{\ensuremath{-}}$, 3/2${}^{\ensuremath{-}}$, 5/2${}^{\ensuremath{-}}$, 7/2${}^{\ensuremath{-}}$ obtained by stochastic multiconfiguration mixing method. Using these functions, quasielastic cross section at $E/A$ = 60 MeV elastic inelastic...
Two-neutron correlation in the ${}^{1}S$ channel quasi-two-dimensional (2D) neutron systems at zero temperature is studied by means of BCS theory with finite-range effective nuclear forces. The dineutron low density confined an infinite slab investigated a simplified model that motion one direction frozen. When thin enough, two neutrons form tightly bound small size quasi-2D system, and Bose gas found limit. With increase Fermi momentum, system changes from Bose-gas phase to superfluid...