Nuclear density functional theory and coexistence in 116,118Te

Abstract

We investigate shape coexistence and band mixing in the transitional nuclei ${}^{116,118}$Te using the Skyrme–Hartree–Fock–Bogolyubov method, a self-consistent realization of nuclear density functional theory, as implemented in the HFODD code. Microscopic calculations of binding energies, charge radii, quadrupole moments, and deformation parameters are performed to establish the structural evolution between the two isotopes. To quantify the interaction between coexisting configurations, we apply a phenomenological two-state mixing model to the lowest $0^{+}$ and $2^{+}$ states, which are commonly associated with vibrational and intruder rotational structures. Our results reveal stronger configuration mixing in ¹¹⁸Te, consistent with enhanced collectivity and shape coexistence in the heavier isotope.