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In the present study, we have investigated the impact of the tensor force onfission paths, in particular the symmetric and asymmetric barriers in 230 Th,226 Th, 222 Th and 216 Th isotopes which display an asymmetric to symmetricfission transition. This analysis has been performed within the HFB approachwith (Q 20 ,Q 30 ,Q 40 ) as collective variable constraints, using the D1ST2aGogny+tensor term interaction and comparing to the standard D1S Gognyinteraction results. The effects from the tensor term on the potential energysurface landscape, and especially on barrier heights and its topology byopening a new valley in agreement with experimental data, are found to becrucial in the description of exotic actinide fission. We conclude that atensor term should be integrated to the long range part of the effectiveinteraction for a better description of the fission.

Description of the asymmetric to symmetric fission transition in the neutron-deficient Thoriums -- Role of the tensor force