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Mean field calculations, based on the D1S, D1N and D1M parametrizations ofthe Gogny energy density functional, have been carried out to obtain thepotential energy surfaces relevant to fission in several Ra isotopes with theneutron number 144 $\le$ N $\le$ 176. Inner and outer barrier heights as wellas first and second isomer excitation energies are given. The existence of awell developed third minimum along the fission paths of Ra nuclei, is analyzedin terms of the energetics of the "fragments" defining such elongatedconfiguration. The masses and charges of the fission fragments are studied asfunctions of the neutron number in the parent Ra isotope. The comparisonbetween fission and $\alpha$-decay half-lives, reveals that the former becomesfaster for increasing neutron numbers. Though there exists a strong variance ofthe results with respect to the parameters used in the computation of thespontaneous fission rate, a change in tendency is observed at N=164 with asteady increase that makes heavier neutron-rich Ra isotopes stable againstfission, diminishing the importance of fission recycling in the r-process.

Microscopic description of fission in neutron-rich Radium isotopes with the Gogny energy density functional