Description of the asymmetric to symmetric fission transition in the neutron-deficient thorium isotopes: Role of the tensor force

R. N. Bernard, N. Pillet, L. M. Robledo, and M. Anguiano
Phys. Rev. C 101, 044615 – Published 27 April 2020

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 Th230, Th226, Th222, and Th216 isotopes which display an asymmetric to symmetric fission transition. This analysis has been performed within the HFB approach with (Q20, Q30, Q40) 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.

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  • Received 12 December 2019
  • Accepted 2 March 2020
  • Corrected 5 May 2020
  • Corrected 22 May 2020

DOI:https://doi.org/10.1103/PhysRevC.101.044615

©2020 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Corrections

5 May 2020

Correction: Figure 9 was processed improperly during the production cycle and has been fixed.

22 May 2020

Second Correction: Figure 9(d) contained an error in the description label and has been replaced. Reference [60] and its citation in Sec. 2a were missing and have been inserted.

Authors & Affiliations

R. N. Bernard1,2,3,*, N. Pillet2,†, L. M. Robledo4, and M. Anguiano5

  • 1Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
  • 2CEA, DAM, DIF, F-91297 Arpajon, France
  • 3Ecole normale supérieure Paris-Saclay, 61 Avenue du Président Wilson, 94230 Cachan, France
  • 4Departamento de Física Teorica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain
  • 5Departamento de Física Atómica, Molecular y Nuclear, Universidad de Granada, E-18071, Granada, Spain

  • *remi.bernard@anu.edu.au
  • nathalie.pillet@cea.fr

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Vol. 101, Iss. 4 — April 2020

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