An IBM2 Description of the E(5) Symmetry in 134Ba and108Pd

With the low-lying energy levels, E2 transition branching ratios andabsolute transition rates of the ¹³⁴Ba and ¹⁰⁸Pd,are investigated in the neutron-proton interacting boson model (IBM2)which includes the quadrupole-quadrupole interaction between like bosons and the E(5) symmetry, it shows that the IBM2 can describe the nucleiat critical point of a phase transition well.