Mixed Symmetry Nuclear Shell Model

Details Mixed Symmetry Nuclear Shell Model Mixed Symmetry Nuclear Shell Model

2003-11-26

arxiv.org/abs/nucl-th/0311094v1

Physics

Nuclear Physics

Nuclear Theory

23 pages, 12pt article style, 14 figures, talk presented at the XV International School on Nuclear Physics, Neutron Physics an

Scientific paper

A mixed-symmetry nuclear shell-model scheme for carrying out calculations in regimes where there is a competition between two or more modes is proposed. A one-dimensional toy model is used to demonstrate the concept. The theory is then applied to $^{24}Mg$ and $^{44}Ti$. For lower pf-shell nuclei such as $^{44-48}Ti$ and $^{48}Cr$ there is strong SU(3) symmetry breaking due to the spin-orbit interaction. However, the quadrupole collectivity as measured by B(E2) transition strengths in the yrast band remain high even though SU(3) appears to be broken. Some results for the so-called X(5) symmetry that falls along the U(5) $\leftrightarrow$ SU(3) leg of the Interacting Boson Model are also considered. The results show that the mixed-symmetry concept is effective, even when strong symmetry breaking occurs.

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