Positive parity states in even-even Te isotopes

The positive-parity collective states in the even-even Te-116 similar to 130 isotopes are studied in the framework of interacting boson model. A schematic Hamiltonian able to describe the transition from U(5) to SU(3) dynamical symmetry is used. It is found that the spectra can be well described by the transition from vibration to rotation. The behavior of the 0(2)(+) state can be partially described by the model, suggesting that the state is mainly composed of the normal sd configuration, but is influenced by the cross-shell excitation across the Z = 50 shell.