RELATIVISTIC NUCLEAR-STRUCTURE .1. NUCLEAR-MATTER
RELATIVISTIC NUCLEAR-STRUCTURE .1. NUCLEAR-MATTER
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DOI：
10.1103/physrevc.42.1965
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发表时间：
1990-11-01
影响因子：
3.1
通讯作者：
MACHLEIDT, R
中科院分区：
文献类型：
--
作者：
BROCKMANN, R;MACHLEIDT, R
描述了核多体问题的Dirac-Brueckner方法的形式，包括它在相对论双核子散射中的基础。构造了一族相对论介子交换势(除了通常的重介子耦合项外)，它将赝矢(梯度)耦合应用于赝标介子(π，η)与核子的相互作用。这些势准确地描述了低能双核子散射和重离子数据。利用这些势，在Dirac-Brueckner-Hartree-Fock近似下计算了核物质的性质，定量地解释了经验核物质饱和度。核物质介质中的有效二体相互作用(G矩阵)直接在核物质静止标架中计算。因此，避免了两核子质心标架和核物质静止标架之间繁琐的变换。详细研究了本方法中包含的相对论效应的大小和性质。本文的形式、势和结果也可以作为系统研究相对论核结构的基础和现实起点，也可以作为进一步研究相对论多体修正和更高阶贡献的基础和现实起点。
The formalism for the Dirac-Brueckner approach to the nuclear many-body problem is described including its basis in relativistic two-nucleon scattering. A family of relativistic meson-exchange potentials is constructed which (apart from the usual coupling terms for heavy mesons) apply the pseudovector (gradient) coupling for the interaction of pseudoscalar mesons (π, η) with nucleons. These potentials describe low-energy two-nucleon scattering and the deuteron data accurately. Using these potentials, the properties of nuclear matter are calculated in the Dirac-Brueckner-Hartree-Fock approximation, in which the empirical nuclear matter saturation is explained quantitatively. The effective two-body interaction in the nuclear matter medium (G matrix) is calculated directly in the nuclear matter rest frame. Thus, cumbersome transformations between the two-nucleon center-of-mass frame and the nuclear matter rest frame are avoided. Size and nature of relativistic effects included in the present approach are examined in detail. The formalism, the potentials, and the results of this paper may also serve as a basis and a realistic starting point for systematic relativistic nuclear structure studies as well as for the investigation of further relativistic many-body corrections and of contributions of higher order.