Kyoto University · Physics and Astronomy
Professor Jie Meng's research lab specializes in theoretical nuclear physics, focusing on relativistic many-body theories to describe exotic and heavy nuclei. Key research directions include relativistic Hartree-Bogoliubov and relativistic mean field theories applied to nuclear structure, particularly in neutron-rich and halo nuclei. The lab investigates fundamental symmetries such as pseudospin symmetry and their connections to nuclear potentials and dynamics, as well as novel phenomena like multiple chiral doublet bands in triaxial nuclei. Advanced theoretical frameworks are developed to study pairing correlations, continuum effects, and exotic nuclear matter.
Figures are computed from collected data and may differ slightly.
Relativistic Hartree-Bogoliubov theory in coordinate space is used to describe the chain of lithium isotopes reaching from ${}^{6}$Li to ${}^{11}$Li. Pairing correlations are taken into account by a density dependent force of zero range. In contrast to earlier investigations within a relativistic mean field theory and a density dependent Hartree-Fock theory, where the halo in ${}^{11}$Li could only be reproduced by an artificial shift of the ${1p}_{1/2}$ level close to the continuum limit, the h
Relating the pseudospin symmetry back to the Dirac equation through the framework of relativistic Hartree-Bogoliubov (RHB) theory, the pseudospin approximation in real nuclei is discussed. From the Dirac equation, the mechanism behind the pseudospin symmetry was studied and the pseudospin symmetry is shown to be connected with the competition between the centrifugal barrier (CB) and the pseudospin orbital potential (PSOP), which is mainly decided by the derivative of the difference between the s
Relativistic Hartree-Bogoliubov theory in coordinate space is used to describe the chain of zirconium isotopes reaching from ${}^{116}\mathrm{Zr}$ to the drip line nucleus ${}^{140}\mathrm{Zr}$. Pairing correlations are taken into account by a density dependent force of zero range. For neutron numbers larger than the magic number $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}82$ a giant neutron halo outside the core of ${}^{122}\mathrm{Zr}$ is predicted. It is formed by up to six neutrons
Based on the relativistic continuum Hartree-Bogoliubov theory, the pseudospin approximation in exotic nuclei is investigated in Zr and Sn isotopes from the proton drip line to the neutron drip line. The quality of the pseudospin approximation is shown to be connected to the competition between the pseudocentrifugal barrier and the pseudospin orbital potential (PSOP). The PSOP depends on the derivative of the difference between the scalar and vector potentials $dV/dr.$ If $dV/dr=0,$ the pseudospi
Adiabatic and configuration-fixed constrained triaxial relativistic mean field (RMF) approaches are developed for the first time. A new phenomenon, the existence of multiple chiral doublets (M\ensuremath{\chi}D), i.e., more than one pair of chiral doublet bands in one single nucleus, is suggested for $^{106}\mathrm{Rh}$ based on the triaxial deformations and their corresponding proton and neutron configurations.
A new relativistic Hartree–Fock approach with density-dependent σ, ω, ρ and π meson–nucleon couplings for finite nuclei and nuclear matter is presented. Good description for finite nuclei and nuclear matter is achieved with a number of adjustable parameters comparable to that of the relativistic mean field approach. With the Fock terms, the contribution of the π-meson is included and the description for the nucleon effective mass and its isospin and energy dependence is improved.
The properties of even-even O, Ca, Ni, Zr, Sn, and Pb isotopes from the $\ensuremath{\beta}$-stability line to the neutron drip line are studied with the relativistic continuum Hartree-Bogoliubov theory, where both the spin-orbit interaction and continuum are properly taken into account. The available experimental binding energies ${E}_{b}$ and two-neutron separation energies ${S}_{2n}$ are reproduced very well. The predicted neutron drip-line nuclei are, respectively, ${}^{74}\mathrm{Ca},$ ${}^
The self-consistent tilted axis cranking relativistic mean-field theory based on a point-coupling interaction has been established and applied to investigate systematically the newly observed shears bands in 60Ni. The tilted angles, deformation parameters, energy spectra, and reduced M1 and E2 transition probabilities have been studied in a fully microscopic and self-consistent way for various configurations and rotational frequencies. It is found the competition between the configurations and t
The β-decay half-lives of neutron-rich nuclei with 20≤Z≤50 are systematically investigated using the newly developed fully self-consistent proton–neutron quasiparticle random phase approximation (QRPA), based on the spherical relativistic Hartree–Fock–Bogoliubov (RHFB) framework. Available data are reproduced by including an isospin-dependent proton–neutron pairing interaction in the isoscalar channel of the RHFB + QRPA model. With the calculated β-decay half-lives of neutron-rich nuclei a remar
Adiabatic and configuration-fixed constraint triaxial relativistic mean field (RMF) approaches are developed for the first time and a new phenomenon, the existence of multi chiral-doublets (M$χ$D), i.e., more than one pairs of chiral doublets bands in one single nucleus, is suggested for nuclei in A~100 region, typically for $^{106}$Rh, based on the triaxial deformations together with their corresponding proton and neutron configurations.
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