标题： 介子标量超子在探测核对称性能量密度依赖性中的作用 显示英文标题

标题： Roles of isoscalar hyperons in probing the density dependence of the nuclear symmetry energy

摘要： 在相对论模型中，研究了标量超子Lambda在探测核对称能密度依赖性中的作用，涉及多Lambda超核、超子丰富物质和中子星。 相对于修改对称能密度依赖性的标量-等矢耦合，建立了三种类型物体的性质与208Pb中子厚度之间的关系。 远离中子滴线的奇异同位素可以通过填充大量Lambda超子而得到稳定。 不同模型中多Lambda超核结合能的差异归因于不同的对称能。 在多Lambda超核中，等矢势与中子厚度的组合对于标量-等矢耦合非常敏感。 在β平衡的超子丰富物质中，Lambda超子分数对标量-等矢耦合的大灵敏度出现在约2-3 rho_0处。 在超子化的中子星中，中子星半径相对于标量-等矢耦合存在开关效应。 显示英文摘要

摘要： The role of the isoscalar hyperon Lambda in probing the density dependence of the nuclear symmetry energy is studied in multi-Lambda hypernuclei, hyperon-rich matter and neutron stars in relativistic models. Relationships between the properties of three types of objects and the neutron thickness in 208Pb are established with respect to the isoscalar-isovector coupling that modifies the density dependence of the symmetry energy. The exotic isotopes far from the neutron drip line can be stabilized by filling in considerable Lambda hyperons. The difference of the binding energy of multi-Lambda hypernuclei from different models is attributed to different symmetry energies. The isovector potential together with the neutron thickness in multi-Lambda hypernuclei investigated is very sensitive to the isoscalar-isovector coupling. The large sensitivity of the Lambda hyperon fraction to the isoscalar-isovector coupling occurs at about 2-3 rho_0 in beta equilibrated hyperon-rich matter. In neutron stars with hyperonization, an on-off effect with respect to the isoscalar-isovector coupling exists for the neutron star radius.