The coexistence of possible magnetic and chiral rotation in ${}^{129}\mathrm{Cs}$ and ${}^{131}\mathrm{La}$: a microscopic investigation

Abstract

A microscopic investigation of the rotational properties in ${}^{129}\mathrm{Cs}$ and ${}^{131}\mathrm{La}$ was carried out using the three-dimensional tilted axis cranking covariant density functional theory (3DTAC-CDFT). The calculations reveal the coexistence of magnetic and chiral rotation built on identical qusiparticle configurations $\pi h_{11/2}^1\otimes \nu h_{11/2}^{-2}$ in ${}^{129}\mathrm{Cs}$ and ${}^{131}\mathrm{La}$, establishing a new type of shape coexistence. The calculations predict the deformation parameters for magnetic rotation in ${}^{129}\mathrm{Cs}$ ($\beta \approx 0.23$, $\gamma \approx 41^{\circ }$) and ${}^{131}\mathrm{La}$ ($\beta \approx 0.25,$ $\gamma \approx 42^{\circ }$), along with those for possible chiral rotation in ${}^{129}\mathrm{Cs}$ ($\beta \approx 0.20,$ $\gamma \approx 29^{\circ }$) and in ${}^{131}\mathrm{La}$ ($\beta \approx 0.20,$ $\gamma \approx 27^{\circ }$). The energy spectra, the relation between the spin and the rotational frequency, and the reduced $M1$ and $E2$ transition probabilities are obtained with the various configurations. The experimental characteristics of band B8 in ${}^{129}\mathrm{Cs}$ and band 13 in ${}^{131}\mathrm{La}$ are well reproduced. Moreover, a distinctive rotational mode transition is uncovered in this work, progressing from the principal-axis rotation to the planar rotation and finally to the chiral rotation, as the rotational frequency evolves through different regimes.

arXiv comment11 pages, 9 figures

References in corpus (37)

• Relativistic Continuum Hartree Bogoliubov Theory for Ground State Properties of Exotic Nuclei
• New parametrization for the nuclear covariant energy density functional with point-coupling interaction
• Relativistic Nuclear Energy Density Functionals: Mean-Field and Beyond
• Multi chiral-doublets in one single nucleus
• Progress on tilted axis cranking covariant density functional theory for nuclear magnetic and antimagnetic rotation
• Chirality of nuclear rotation
• Novel structure for magnetic rotation bands in 60Ni
• From chiral vibration to static chirality in ^{135}Nd
• Description of Multi Quasi Particle Bands by the Tilted Axis Cranking Model
• Chiral bands for quasi-proton and quasi-neutron coupling with a triaxial rotor
• Towards an ab initio covariant density functional for nuclear structure
• Critical frequency in nuclear chiral rotation
• Nuclear chiral doublet bands data tables
• Multiple Chirality in Nuclear Rotation: A Microscopic View
• Nuclear chiral and magnetic rotation in covariant density functional theory
• Candidate chiral doublet bands in the odd-odd nucleus ${}^{126}$Cs
• Shape coexistence and the role of axial asymmetry in ${}^{72}$Ge
• Doublet bands in ${}^{126}$Cs in the triaxial rotor model coupled with two quasiparticles
• Search for the Skyrme-Hartree-Fock Solutions for Chiral Rotation in N=75 Isotones
• Collective Hamiltonian for chiral modes
• Impact of pairing correlations on the orientation of the nuclear
• Magnetic rotations in 198Pb and 199Pb within covariant density functional theory
• Shape coexistence in even-even nuclei: A theoretical overview
• Diversity of shapes and rotations in the gamma-soft 130Ba nucleus: first observation of a t-band in the A=130 mass region
• Yrast band of 109Ag described by tilted axis cranking covariant density functional theory with a separable pairing force
• Relativistic description of magnetic moments in nuclei with doubly closed shells plus or minus one nucleon
• Magnetic moments of ${}^{33}$Mg in time-odd relativistic mean field approach
• Magnetic rotations in 198Pb and 199Pb within covariant density functional theory with pairing correlations
• A microscopic resolution of the chiral conundrum with crossing twin bands in Ag-106
• Multiple chiral bands in ${}^{137}$Nd
• Nuclear chiral rotation induced by superfluidity
• Calculation of microscopic nuclear level densities based on covariant density functional theory
• Covariant density functional theory for nuclear chirality in ${}^{135}$Nd
• The evolution of the chiral symmetry in cesium isotopes
• Systematic investigations of positive-parity doublet bands with three-quasiparticle configurations in ${}^{125,127,129,131}$Cs
• Energy staggering parameters in nuclear magnetic rotational bands
• The charge radii of calcium isotopes within relativistic density functional theory: nucleon's finite-size and quadrupole shape fluctuation effects