Two 0+ excited states in 40Ca with diabatic and adiabatic constrained approaches

Two 0+ excited states of 40Ca have been investigated by the potential energy surface (PES) obtained from both adiabatic and diabatic constrained approaches, combined with the relativistic mean field (RMF) theory. A well-defined second minimum appears on the diabatic PES that does not exists on the adiabatic PES. The configurations of these two 0+ excited states are determined as 4p–4h and 8p–8h excitation from their counterparts at the spherical configuration. The excited energies were reduced by microscopic correction for the center-of-mass motion, and a gap at 18 appears in their single particle diagrams. (author)