Quasi-SU(3) truncation scheme for even-even sd-shell nuclei

Abstract

The Quasi-SU(3) symmetry was uncovered in full pf and sdg shell-model calculations for both even-even and odd-even nuclei. It manifests itself through a dominance of single-particle and quadrupole-quadrupole terms in the Hamiltonian used to describe well-deformed nuclei. A practical consequence of the quasi-SU(3) symmetry is an efficient basis truncation scheme. In a recent work was shown that when this type of Hamiltonian is diagonalized in an SU(3) basis, only a few irreducible represntations (irreps) of SU(3) are needed to describe the Yrast band, the leading S = 0 irrep augmented with the leading S = 1 irreps in the proton and neutron subspaces. In the present article the quasi-SU(3) truncation scheme is used, in conjunction with a "realistic but schematic" Hamiltonian that includes the most important multipole terms, to describe the energy spectra and B(E2) transition strengths of 20-Ne, 22-Ne, 24-Mg and 28-Si. The effect of the size of the Hilbert space on both sets of observables is discussed, as well as the structure of the Yrast band and the importance of the various terms in the Hamiltonian.

30 pages, 8 figures. Submited to Nucl. Phys. A

References in corpus (2)

• Shell model description of normal parity bands in odd-mass heavy deformed nuclei
• Pseudo SU(3) shell model: Normal parity bands in odd-mass nuclei

Cited by in corpus (11)

• The Shell Model as Unified View of Nuclear Structure
• Symmetry-guided large-scale shell-model theory
• Simplified modeling of cluster-shell competition in ${}^{20}$Ne and ${}^{24}$Mg
• Solution of large scale nuclear structure problems by wave function factorization
• Electron-scattering form factors for 6Li in the ab initio symmetry-guided framework
• Microscopic study of neutron-rich Dysprosium isotopes
• Theoretical description of the double beta decay of 160Gd
• Excited bands in odd-mass rare-earth nuclei
• SU(3)-guided Realistic Nucleon-nucleon Interactions for Large-scale Calculations
• Study of the Q.Q Interaction- Single Particle Behavior to Elliott's Rotations
• A modern Fortran library for SU(3) coupling and recoupling coefficients