Davydov-Chaban Hamiltonian with deformation-dependent mass term for γ = 30°

Abstract

Motivation : Several theoretical comparisons with experimental data have recently pointed out that the mass tensor of the collective Bohr Hamiltonian cannot be considered as a constant and should be taken as a function of the collective coordinates. Method : The Davydov-Chaban Hamiltonian, describing the collective motion of γ-rigid atomic nuclei, is modified by allowing the mass to depend on the nuclear deformation. Moreover, the eigenvalue problem for this Hamiltonian is solved for Davidson potential and γ = 30° involving an Asymptotic Iteration Method (AIM). The present model is conventionally called Z(4)-DDM-D (Deformation Dependent Mass with Davidson potential), in respect to the so called Z(4) model. Results : Exact analytical expressions are derived for energy spectra and normalized wave functions, for the present model. The obtained results show an overall agreement with the experimental data for 108-116Pd, 128-132Xe, 136;138Ce and 190-198Pt and an important improvement in respect to other models. Prediction of a new candidate nucleus for triaxial symmetry is made. Conclusion : The dependence of the mass on the deformation reduces the increase rate of the moment of inertia with deformation, removing a main drawback of the model and leading to an improved agreement with the corresponding experimental data.

20p, 8 figs, 3 Tabs (accepted for publication in nucl. Phys. A)

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Cited by in corpus (4)

• Excited states of odd-mass nuclei with different deformation-dependent mass coefficients
• Bohr Hamiltonian with Pöschl Teller potential in γ unstable and γ stable pictures
• Probing DDM and ML quantum concepts in shape phase transitions of $\gamma$-unstable nuclei
• Coriolis contribution to excited states of odd-mass nuclei with different deformation-dependent mass coeffcients