Physics of Fock Terms on Fourth-order Symmetry Energy of Nuclear Matter

LIU Zhiwei; QIAN Zhuang; SUN Baoyuan

doi:10.11804/NuclPhysRev.35.04.549

The density dependence of nuclear fourth-order symmetry energy S₄ is studied within the covariant density functional (CDF) theory in terms of the kinetic energy, isospin-singlet, and isospin-triplet potential energy parts of the energy density functional. When the Fock diagram is introduced, it is found that both isospin-singlet and isospin-triplet components of the potential energy plays important roles in determining the fourth-order symmetry energy. Especially, an extra suppression, which comes from the Fock terms via isoscalar meson-nucleon coupling channels, is revealed in the isospin-triplet potential part of the fourth-order symmetry energy. As an useful attempt, the generalized symmetry energy is introduced to describe the various orders of nuclear symmetry energies in a visual and self-consistent way.

Physics of Fock Terms on Fourth-order Symmetry Energy of Nuclear Matter

1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China;

2. Engineering Research Center for Neutron Application Technology, Ministry of Education, Lanzhou University, Lanzhou 730000, China

Funds: National Natural Science Foundation of China(11875152)

Received Date: 2018-09-15

Rev Recd Date: 2018-12-12

Publish Date: 2020-05-03

Key words:

Abstract: The density dependence of nuclear fourth-order symmetry energy S₄ is studied within the covariant density functional (CDF) theory in terms of the kinetic energy, isospin-singlet, and isospin-triplet potential energy parts of the energy density functional. When the Fock diagram is introduced, it is found that both isospin-singlet and isospin-triplet components of the potential energy plays important roles in determining the fourth-order symmetry energy. Especially, an extra suppression, which comes from the Fock terms via isoscalar meson-nucleon coupling channels, is revealed in the isospin-triplet potential part of the fourth-order symmetry energy. As an useful attempt, the generalized symmetry energy is introduced to describe the various orders of nuclear symmetry energies in a visual and self-consistent way.

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Physics of Fock Terms on Fourth-order Symmetry Energy of Nuclear Matter

doi: 10.11804/NuclPhysRev.35.04.549

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