论文标题
自旋极化不对称核物质的旋转不稳定性
Spinodal instabilities of spin polarized asymmetric nuclear matter
论文作者
论文摘要
我们分析了中子和质子自旋的多种构型在零温度下自旋极化不对称核物质的旋转不稳定性。使用Argonne V18核子核电势和urbana类型的三核力量，使用Brueckner-Hartree-fock（BHF）方法进行计算。能量密度的分析参数化（以良好的精度再现）用于确定旋转不稳定性区域。我们发现，与中子和质子旋转的方向无关，当系统极化时，Spinodal不稳定性区域会变形，当中子和质子旋转是在抗管平行的情况下，其尺寸小于与平行方式定向时。我们还发现，旋律不稳定性始终由总密度波动独立于系统的极化程度，并且在液相中恢复异种对称性，{\ it} {\ it}所谓的isospin蒸馏或片段化效应效果较低，随着系统的极化效率。
We analyze the spinodal instabilities of spin polarized asymmetric nuclear matter at zero temperature for several configurations of the neutron and proton spins. The calculations are performed with the Brueckner--Hartree--Fock (BHF) approach using the Argonne V18 nucleon-nucleon potential plus a three-nucleon force of Urbana type. An analytical parametrization of the energy density, which reproduces with good accuracy the BHF results, is employed to determine the spinodal instability region. We find that, independently of the of the orientation of the neutron and proton spins, the spinodal instability region shinks when the system is polarized, being its size smaller smaller when neutron and proton spins are antiparallel than when they are oriented in a parallel way. We find also that the spinodal instability is always dominated by total density fluctuation independently of the degree of polarization of the system, and that restoration of the isospin symmetry in the liquid phase, {\it i.e.,} the so-called isospin distillation or fragmentation effect, becomes less efficient with the polarization of the system.
