The tensor force is an essential element of NN interaction, significantly influencing the structural and dynamical characteristics of nuclear many-body systems. Previous research has extensively explored the tensor force's impact within effective NN interactions in nuclear media, but its effects stemming from realistic NN interactions are less understood.
This study delves into the tensor-force effects on the equation of state and symmetry energy of nuclear matter using the relativistic Brueckner-Hartree-Fock (RBHF) theory, a major relativistic ab initio method. Findings indicate that the tensor-force effects are attractive for the binding energies per particle of symmetric nuclear matter (SNM) and symmetry energy, especially near the empirical saturation density. However, for pure neutron matter, these effects are minimal.
Additionally, the research demonstrates that a strong tensor force causes the neutron-proton system to deviate from the unitary limit. By adjusting the tensor-force strength, the study places dilute SNM at the unitary limit. When considering only the interaction in the 3S1-3D1 channel, the ground-state energy of dilute SNM is proportional to that of a free Fermi gas with a scaling factor of 0.38, indicating good universal properties for a four-component unitary Fermi gas (spin-1/2 and isospin-1/2).
Related Links
Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University
Understanding Time and Space
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