Structural evolution in A ≈ 100 nuclei within the mapped interacting boson model based on the Gogny energy density functional

The structure of even-even neutron-rich Ru, Mo, Zr, and Sr nuclei in the A approximate to 100 mass region is studied within the interacting boson model (IBM) with microscopic input from the self-consistent mean-field approximation based on the Gogny-D1M energy density functional. The deformation-energy surface in the quadrupole deformation space (beta,gamma), computed within the constrained Hartree-Fock-Bogoliubov framework, is mapped onto the expectation value of the appropriately chosen IBM Hamiltonian with configuration mixing in the boson condensate state. The mapped IBM Hamiltonian is used to study the spectroscopic properties of Ru98-114, Mo96-112, Zr94-110, and Sr92-108. Several cases of gamma-soft behavior are predicted in Ru and Mo nuclei while a pronounced coexistence between strongly prolate and weakly oblate deformed shapes is found for Zr and Sr nuclei. The method describes well the evolution of experimental yrast and nonyrast states as well as selected B(E2) transition probabilities.