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

Abstract

In the present study, we have investigated the impact of the tensor force on fission paths, in particular the symmetric and asymmetric barriers in 230 Th, 226 Th, 222 Th and 216 Th isotopes which display an asymmetric to symmetric fission transition. This analysis has been performed within the HFB approach with (Q 20 ,Q 30 ,Q 40 ) as collective variable constraints, using the D1ST2a Gogny+tensor term interaction and comparing to the standard D1S Gogny interaction results. The effects from the tensor term on the potential energy surface landscape, and especially on barrier heights and its topology by opening a new valley in agreement with experimental data, are found to be crucial in the description of exotic actinide fission. We conclude that a tensor term should be integrated to the long range part of the effective interaction for a better description of the fission.

24 pages, accepted in Phys. Rev. C

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• Comparison of fission and quasi-fission modes
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• Shell effects in quasi-fission for calcium induced reactions forming thorium isotopes
• Role of tensor terms of the Skyrme energy-density functional on neutron deformed magic numbers in the rare-earth region
• Microscopic description of spontaneous fission based on a Gogny energy density functional including tensor contributions
• Impact of finite-range spin-orbit and tensor terms in Gogny EDF