摘要
在Brueckner Hartree Fock理论框架内 ,研究了自旋极化核物质的状态方程及其自旋依赖性 ,计算了相关的物理量如朗道参数G0 和G′0 ,并着重讨论了三体核力的影响 .结果表明 :在整个自旋极化度范围内 ,自旋极化核物质的每核子能量随中子和质子自旋极化度的变化相当精确地满足二次方规律 ,而且在Brueckner Hartree Fock理论框架内 ,自旋非极化核物质的能量总是比相应的自旋极化核物质的能量低 ,这表明核物质中不会发生由自旋非极化态向自旋极化态的自发相变 .当密度较低时 ,三体核力对核物质状态方程的自旋依赖性的影响不明显 ;随着密度的增大 ,三体核力效应增强 ,而且三体核力使朗道参数G0 和G′0 增大 。
Within the spin-dependent Brueckner-Hartree-Fock framework, the equation of state of the spin-polarized nuclear matter has been investigated by adopting the realistic nucleon-nucleon interaction AV 18 supplemented with a microscopic three-body force. The related physical quantities such as the Landau parameters G 0 in spin channel and G′ 0 in spin-isospin channel, have been calculated. The three-body force effects have been studied and stressed with a special attention. It is shown that in the Brueckner-Hartree-Fock framework the predicted energy per particle of spin-polarized nuclear matter versus the neutron and proton spin-polarization parameters fulfills a quadratic law in the whole range of spin-polarization. At the empirical saturation density, the calculated Landau parameter G′ 0 is 1.22 and 1.28 respectively for the two-cases with and without including the three-body force, both are in agreement with its experimental value. Both the Landau parameters G 0 and G′ 0 are positive in the density region up to ρ=0.5fm -3 and increase monotonically as increasing density so that no any evidence is found for a spontaneous transition to a ferromagnetic state in nuclear matter. The three-body force effect is to strongly increase the Landau parameters G 0 and G′ 0 at high densities, making the nuclear matter at high densities more stable against spin and spin-isospin fluctuations. The obtained Landau parameters G 0 and G′ 0 together with their density dependences may serve as constraints on the spin-spin parts and spin-isospin dependent parts of the phenomenological Skyrme and Skyrme-like interactions.
出处
《高能物理与核物理》
CSCD
北大核心
2004年第3期284-289,共6页
High Energy Physics and Nuclear Physics
基金
中国科学院百人计划
中国科学院知识创新工程重要方向性项目 (KJCX2 SW N0 2 )
国家重点基础研究发展规划项目 (G2 0 0 0 0 7740 0 )
国家科技部重大前期研究专项基金 ( 2 0 0 2CCB0 0 2 0 0 )
国家自然科学重点基金项目 ( 10 2 3 5 0 3 0 )资助~~
