Abstract
A description of the even-even Ba isotopes for A = 140 to 148 in framework of Bohr-Mottelson model, interacting boson model and interacting vector boson model are carried out. The E-GOS curve (E gamma/I) and the ratio between the energies of the (I + 2) and (I) states (r(I + 2)/I) as a function of the spin (I) have been drawn to determine the property of the ground-state band. The positive ground-state band of Ba140-148 has been calculated using Bohr-Mottelson model, interacting boson model and interacting vector boson model, while the negative-parity band of Ba140-148 has been calculated using Bohr-Mottelson model and interacting vector boson model only. The reduced transition probabilities B(E2) of these nuclei were calculated. The parameters of the best fit to the measured data are determined. The potential energy surfaces (PESs) to the IBM Hamiltonian have been obtained using the intrinsic coherent state.