自旋极化的对称核物质和中子物质的性质

Properties of Spin Polarized Isospin Symmetric Nuclear Matter and Neutron Matter

利用Skyrme有效相互作用对自旋极化的同位旋对称核物质和中子物质的特性进行了研究 .用 4种核子 -核子相互作用参数SⅢ ,SKM ,SLy2 30a和SLy2 30b ,分别描绘了核物质状态方程曲线 .可以发现不论使用哪一种参数 ,在自旋极化的同位旋对称核物质和中子物质中都存在着磁化相变转换点 .另外还对磁化系数进行了计算 ,给出了磁化系数比率随密度的变化关系 ,由于无限不连续点的存在 ,进一步肯定了在Skyrme Hartree

The properties of the spin polarized isospin symmetric nuclear matter and neutron matter as well as their equations of state are investigated by employing the Skyrme effective interaction with four sets of parameters SKM *, SⅢ, SLy230a and SLy230b. Whichever Skyrme parameter is used, the ferromagnetic phase transitions are predicted in both the isospin symmetric nuclear matter and neutron matter. Above the critical density, the polarized matter becomes more stable than the unpolarized one. Consequently such a phase transition is one of the possible explanations of the strong magnetic field in neutron stars. In addition the magnetic susceptibility χ is also evaluated and the ratio χ / χ F is obtained as a function of the density. The existence of an infinite discontinuity confirms the occurrence of a ferromagnetic phase transition once more.