Influence of the tensor force on the microscopic heavy-ion interaction potential

Guo, Lu; Godbey, Kyle; Umar, A. S.

doi:10.1103/physrevc.98.064607

Title: Influence of the tensor force on the microscopic heavy-ion interaction potential

Journal Article · Tue Dec 11 00:00:00 EST 2018 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.98.064607· OSTI ID:1612037

Guo, Lu ^[1]; Godbey, Kyle ^[2]; Umar, A. S. ^[2]

Univ. of Chinese Academy of Sciences, Beijing (China); Chinese Academy of Sciences (CAS), Beijing (China)
Vanderbilt Univ., Nashville, TN (United States)

The tensor interaction is known to play an important role in the nuclear structure studies of exotic nuclei. However, most microscopic studies of low-energy nuclear reactions neglect the tensor force, resulting in a lack of knowledge concerning the effect of the tensor force on heavy-ion collisions. An accurate description of the heavy-ion interaction potential is crucial for understanding the microscopic mechanisms of heavy-ion fusion dynamics. Furthermore, the building blocks of the heavy-ion interaction potential in terms of the ingredients of the effective nucleon-nucleon interaction provides the physical underpinnings for connecting the theoretical results with experiment. The tensor force has never been incorporated for calculating the nucleus-nucleus interaction potential. The theoretical study of the influence of the tensor force on heavy-ion interaction potentials is required to further our understanding of the microscopic mechanisms entailed in fusion dynamics. The full Skyrme tensor force is implemented into the static Hartree-Fock and dynamic density-constrained time-dependent Hartree-Fock (DC-TDHF) theory to calculate both static (frozen density) and dynamic microscopic interaction potentials for reactions involving exotic and stable nuclei. The static potentials are found to be systematically higher than the dynamical results, which are attributed to the microscopic dynamical effects included in TDHF. We also show that the dynamical potential barriers vary more significantly by the inclusion of tensor force than the static barriers. The influence of isoscalar and isovector tensor terms is also investigated with the TIJ set of forces. For light systems, the tensor force is found to have an imperceptible effect on the nucleus-nucleus potential. However, for medium and heavy spin-unsaturated reactions, the potentials may change from a fraction of an MeV to almost 2 MeV by the inclusion of tensor force, indicating a strong impact of the tensor force on subbarrier fusion. The tensor force could indeed play a large role in the fusion of nuclei, with spin-unsaturated systems seeing a systematic increase in ion-ion barrier height and width. Furthermore, this fusion hindrance is partly due to static, ground-state effects from the inclusion of the tensor force, though additional hindrance appears when studying nuclear dynamics.

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Research Organization:: Vanderbilt Univ., Nashville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0013847

OSTI ID:: 1612037

Alternate ID(s):: OSTI ID: 1485349

Journal Information:: Physical Review C, Vol. 98, Issue 6; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Influence of the tensor interaction on heavy-ion fusion cross sections Godbey, K.; Guo, Lu; Umar, A. S. Physical Review C, Vol. 100, Issue 5 https://doi.org/10.1103/physrevc.100.054612	journal	November 2019
TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review Sekizawa, Kazuyuki Frontiers in Physics, Vol. 7 https://doi.org/10.3389/fphy.2019.00020	journal	March 2019
TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: a Mini Review Sekizawa, Kazuyuki arXiv https://doi.org/10.48550/arxiv.1902.01616	text	January 2019
Influence of the tensor interaction on heavy-ion fusion cross sections Godbey, K.; Guo, Lu; Umar, A. S. arXiv https://doi.org/10.48550/arxiv.1909.04005	text	January 2019

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Physics
Low & intermediate energy heavy-ion reactions
Nuclear forces
Nuclear fusion
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Nuclear density functional theory

Title: Influence of the tensor force on the microscopic heavy-ion interaction potential

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