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Structural evolution in neutron-rich Os and W isotopes is investigated interms of the Interacting Boson Model (IBM) Hamiltonian determined by(constrained) Hartree-Fock-Bogoliubov (HFB) calculations with the Gogny-D1SEnergy Density Functional (EDF). The interaction strengths of the IBMHamiltonian are produced by mapping the potential energy surface (PES) of theGogny-EDF with quadrupole degrees of freedom onto the corresponding PES of theIBM system. We examine the prolate-to-oblate shape/phase transition which ispredicted to take place in this region as a function of neutron number $N$within the considered Os and W isotopic chains. The onset of this transition isfound to be more rapid compared to the neighboring Pt isotopes. Thecalculations also allow prediction of spectroscopic variables (excited stateenergies and reduced transition probabilities) which are presented for theneutron-rich $^{192,194,196}$W nuclei, for which there is only very limitedexperimental data available to date.

Spectroscopic calculations of the low-lying structure in exotic Os and W isotopes