在Extended Brueckner-Hartree-Fock（EBHF）近似下,采用Argonne V18势作为核子-核子相互作用,计算了基态非对称核物质中核子动量的分布。对核子的动量分布对同位旋不对称度的依赖关系进行了描述和讨论。结果表明,在不对称度为零时,质子与中子有着基本相同的动量分布。随着不对称度的增加,在各自的费米面以下,质子动量分布减小而中子动量分布增大。对费米面处的准粒子强度也进行了计算和讨论。本结果较好地满足了两个理论检验标准Migdal-Luttinger theorem和粒子数守恒律。
We calculate the momentum distribution of nucleons in asymmetric nuclear matter within the framework of the extended Brueckner-Hartree-Fock approximation at zero temperature,use Argonne V18 potential as two nucleons potential.The isospin-asymmetry dependence of the nuc-leon momentum distribution predicted and discussed.It is shown that as the asymmetry increases,the proton momentum distribution become smaller while the neutron one gets higher below their respective Fermi surfaces with respect to their common values in symmetric nuclear matter.The quasi-particle strength at the Fermi momentum also calculated and discussed,we got an improved fulfillment of the Migdal-Luttinger theorem and nucleon number conservation.
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