,How tightly is the nuclear symmetry energy constrained by a unitary Fermi gas?

• 作 者: Nai-Bo Zhang Bao-Jun Cai Bao-An Li William G. Newton Jun Xu
• 机 构: Department of Physics and Astronomy,Texas A&M University-Commerce,Commerce,TX 75429,USA“,”Shandong P
• 出 处: 核技术（英文版）
• 发表日期: 2017年12期
• 关键词: Symmetry energy Unitary gas Equation of state Nuclear matter

We examine critically how tightly the density dependence of nuclear symmetry energy Esym(ρ) is con-strained by the universal equation of state of the unitary Fermi gas EUG(ρ) considering currently known uncertain-ties of higher order parameters describing the density dependence of the equation of state of isospin asymmetric nuclear matter. We found that EUG (ρ) does provide a useful lower boundary for the Esym(ρ) . However, it does not tightly constrain the correlation between the magnitude Esym(ρ0) and slope L unless the curvature Ksym of the symmetry energy at saturation densityρ0 is more precisely known. The large uncertainty in the skewness parameters affects the Esym(ρ0) versus L correlation by the same almost as significantly as the uncertainty in Ksym.