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

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

2008-11-21

arxiv.org/abs/0811.3511v1

Physics

Nuclear Physics

Nuclear Theory

48 pages, 11 figures

Scientific paper

10.1016/j.nuclphysa.2009.01.006

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.

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