Unveiling the origin of shape coexistence in lead isotopes
J. L. Egido, L. M. Robledo, R. R. Rodriguez-Guzman
Abstract
The shape coexistence in the nuclei 182-192Pb is analyzed within the Hartree-Fock-Bogoliubov approach with the effective Gogny force. A good agreement with the experimental energies is found for the coexisting spherical, oblate and prolate states. Contrary to the established interpretation, it is found that the low-lying prolate and oblate 0+ states observed in this mass region are predominantly characterized by neutron correlations whereas the protons behave as spectators rather than playing an active role.
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