Quadrupole and octupole collectivity and cluster structures in neon isotopes

Abstract

The lowest positive- and negative-parity bands of ${}^{20}$Ne and neutron-rich even-even Ne isotopes are investigated using a theoretical framework based on energy density functionals. Starting from a self-consistent relativistic Hartree-Bogoliubov calculation of axially-symmetric and reflection-asymmetric deformation energy surfaces, the collective symmetry-conserving states are built using projection techniques and the generator coordinate method. Overall a good agreement with the experimental excitation energies and transition rates is obtained. In particular, the model provides an accurate description of the excitation spectra and transition probabilities in ${}^{20}$Ne. The contribution of cluster configurations to the low-energy states is discussed, as well as the transitional character of the ground state. The analysis is extended to ${}^{22}$Ne and the shape-coexisting isotope ${}^{24}$Ne, and to the drip-line nuclei ${}^{32}$Ne and ${}^{34}$Ne. The role of valence neutrons in the formation of molecular-type bonds between clusters is discussed.

arXiv comment16 pages, 15 figures, 2 tables, Accepted for Publication in Physical Review C

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• Islands of shape coexistence from single-particle spectra in covariant density functional theory
• Cluster structures in ${}^{12}$C from global energy density functionals
• Microscopic core-quasiparticle coupling model for spectroscopy of odd-mass nuclei with octupole correlations
• Alpha-particle condensation: a nuclear quantum phase transition
• Microscopic description of the self-conjugate ${}^{108}$Xe and ${}^{104}$Te $\alpha$-decay chain
• Single-particle spatial dispersion and clusters in nuclei
• Shape phase transitions in odd-A Zr isotopes
• Properties of $K^{\pi }=0_1^{+}$, $K^{\pi }=2^{-}$, and $K^{\pi }=0_1^{-}$ bands of ${}^{20}$Ne probed via proton and alpha inelastic scattering
• Octupole correlations in collective excitations of neutron-rich $N\approx 56$ nuclei
• Evidence of bicluster structure in the ground state of ${}^{20}$Ne
• Low-energy cluster vibrations in N = Z nuclei
• Ab-initio no-core shell model study of ${}^{18-24}$Ne isotopes
• A variety of clustering in ${}^{18}$O
• Symmetry-projected variational calculations with the numerical suite TAURUS II. Configuration mixing of symmetry-projected reference states
• Low-energy monopole strength in spherical and deformed nuclei : cluster and soft modes
• Configuration interaction relativistic Hartree-Fock model
• Generator coordinate method for nuclear octupole excitations: status and perspectives
• Localisation and alpha radioactivity
• Observation of long-range collective flow in OO and NeNe collisions and implications for nuclear structure studies
• Shell and cluster structures in ${}^{20}$Ne in the variation of multiple bases of the antisymmetrized molecular dynamics
• Wormhole Model for Neon-20