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arXiv 0904.1471nucl-th
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弱束缚核和真实的NN相互作用

Weakly bound nuclei and realistic NN interactions

E. N. E. van Dalen, P. Gögelein, H. Müther

摘要:

采用基于低动量相互作用$V_{lowk}$的相互作用模型描述了中子滴线附近的核。这种有效的两体相互作用被确定为再现能量低于π介子阈值的核子-核子(NN)散射数据,补充了密度依赖的接触相互作用,适合再现无限核物质的饱和性质的Hartree-Fock方法。它表明,相应的计算封闭壳核使用这种相互作用模型再现这些核的体性质,独立的波函数是在谐振子波或在适当大小的球盒离散的平面波的基础上展开。然而,这种平面波基更适合于描述弱束缚核和从离散核到均匀物质的转变,这种转变被认为发生在例如中子星的地壳中。在Hartree-Fock加BCS近似下研究了奇异核的性质。

英文摘要:

Nuclei close to the neutron drip line are described employing an interaction model which is based on the low-momentum interaction $V_{lowk}$. This effective two-body interaction which is determined to reproduce the nucleon-nucleon (NN) scattering data at energies below the pion thresh-hold is supplemented by a density-dependent contact interaction fitted to reproduce the saturation properties of infinite nuclear matter within the Hartree-Fock approach. It is demonstrated that corresponding calculations for closed shell-nuclei using this interaction model reproduce the bulk properties of these nuclei, independent whether the wave functions are expanded in terms of harmonic oscillator waves or in a basis of plane waves discretized in a spherical box of appropriate size. This plane wave basis, however, is more appropriate to describe weakly bound nuclei and the transition from discrete nuclei to homogeneous matter which is supposed to occur e.g. in the crust of neutron stars. Properties of exotic nuclei are studied within a Hartree-Fock plus BCS approximation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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