Shape changes of N=66 isotones Mo–Ce in DPPQ model

The dynamic pairing plus quadrupole model is used to study the changes in nuclear structure of N =66 isotones of Mo–Sn–Ce. Two different single-particle configurations have been used for Z Z ⩾50 regions and their suitability for respective regions is illustrated. The variations with Z of the quadrupole deformation β , deformation energy E d , and the 2 1 + state energy, B (E2;0 + →2 + ) and quadrupole moment Q (2 + ) are reproduced. The role of the spin–orbit partner (SOP) orbitals in n–p interaction for inducing the deformation in each region is studied.