Istituto Nazionale di Fisica Nucleare, Largo Pontecorvo 3, 56127 Pisa, Italy.
Department of Physics, University of Pisa, 56127 Pisa, Italy.
Phys Rev Lett. 2018 Aug 17;121(7):072701. doi: 10.1103/PhysRevLett.121.072701.
The large values of the singlet and triplet two-nucleon scattering lengths locate the nuclear system close to the unitary limit. This particular position strongly constrains the low-energy observables in the three-nucleon system as depending on one parameter, the triton binding energy, and introduces correlations in the low-energy sector of light nuclei. Here we analyze the propagation of these correlations to infinite nuclear matter showing that its saturation properties, the equation of state of β-stable nuclear matter, and several properties of neutron stars, as their maximum mass, are well determined solely by a few number of low-energy quantities of the two- and three-nucleon systems. In this way we make a direct link between the universal behavior observed in the low-energy region of few-nucleon systems and fundamental properties of nuclear matter and neutron stars.
单态和三重态两核散射长度的较大值将核系统置于接近幺正极限的位置。这一特殊位置强烈约束了三核系统中的低能可观测量，这些可观测量取决于一个参数，即氚的束缚能，并在轻核的低能区域引入相关性。在这里，我们分析了这些相关性向无限核物质的传播，表明其饱和性质，即β稳定核物质的状态方程，以及一些中子星的性质，如其最大质量，仅由两个和三个核系统的少数几个低能量确定。通过这种方式，我们将在几个核系统的低能区观察到的普遍行为与核物质和中子星的基本性质直接联系起来。
