Symmetric and asymmetric structural evolutions of Te isotopes across the N=82 shell closure

Systematic calculations of low-lying energy levels, BE(2) transitions, and g factors of even-even tellurium isotopes with mass numbers from 128 to 140 are performed via the nucleon-pair approximation (NPA) of the shell model with phenomenological multipole-multipole interactions. An optimal agreement is obtained between the calculated results and experimental data. The yrast band structures of nuclei below and above the N = 82 shell closure are compared and discussed. In particular, the evolutionary differences of B(E2; 2(1)(+) -> 0(1)(+)) values and g(2(1)(+)) factors, with respect to the symmetry of N = 82, are attributed to the dominant contribution differences in neutron and proton excitations, respectively.