Interacting boson model study of the spin evolution of the yrast E2 transition probabilities in 162Yb -: art. no. 044308

An angular momentum dependence of the yrast E2 transition probabilities and the spectra of the low-lying states in the even-even collective nuclei are analyzed. It is shown that in the interacting boson model (IBM) it is possible to describe simultaneously the transitionlike low-lying level scheme with the rotational-like yrast B(E2) values. For some values of the parameters of the general IBM-1 Hamiltonian, the values of the ratio B(E2;(I+2)(1)-->I-1)/B(E2;2(1)(+)-->0(1)(+)) can fall down below the rotational limit of the geometrical model and also below the prediction of the SU(3) limit of the IBM.