A solvable model which has X(5) as a limiting symmetry and removes some inherent drawbacks

Abstract

Solvable Hamiltonians for the $\beta$ and $\gamma$ intrinsic shape coordinates are proposed. The eigenfunctions of the $\gamma$ Hamiltonian are spheroidal periodic functions, while the Hamiltonian for the $\beta$ degree of freedom involves the Davidson's potential and admits eigenfunctions which can be expressed in terms of the generalized Legendre polynomials. The proposed model goes to X(5) in the limit of $|\gamma |$-small. Some drawbacks of the X(5) model, as are the eigenfunction periodicity and the $\gamma$ Hamiltonian hermiticity, are absent in the present approach. Results of numerical applications to ${}^{150}$Nd, ${}^{154}$Gd and ${}^{192}$Os are in good agreement to the experimental data. Comparison with X(5) calculations suggests that the present approach provides a quantitative better description of the data. This is especially true for the excitation energies in the gamma band.

arXiv comment48 pages, 11 figures

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Cited by in corpus (7)

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• Application of the sextic oscillator with centrifugal barrier and the spheroidal equation for some X(5) candidate nuclei
• Description of the isotope chain ${}^{180-196}$Pt within some solvable approaches
• Semiclassical unified description of wobbling motion in even-even and even-odd nuclei
• New features of the triaxial nuclei described with a coherent state model
• Conjunction of $\gamma$-rigid and $\gamma$-stable collective motion in the critical point of the phase transition from spherical to deformed nuclear shapes
• A new boson approach for the wobbling motion in even-odd nuclei