Density dependent hadron field theory for asymmetric nuclear matter and exotic nuclei
Density dependent hadron field theory for asymmetric nuclear matter and exotic nuclei
复制标题
DOI：
10.1103/physrevc.64.034314
复制
发表时间：
2000-07
影响因子：
3.1
通讯作者：
F. Hofmann;C. Keil;H. Lenske
中科院分区：
文献类型：
--
作者：
F. Hofmann;C. Keil;H. Lenske
发稿：PHYS。摘要：密度相关的相对论强子场理论应用于强不对称核物质和远离稳定性的有限核。从非对称物质中的Dirac-Brueckner Hartree-Fock(DBHF)计算导出了一组新的介质中介子-核子顶点，现在还考虑了向量耦合常数与密度的关系。标量矢量$Delta$介子也被包括在内。核物质计算表明，为了通过DDRH平均场计算重现DBHF状态方程，在从DBHF自能中提取耦合常数时需要引入动量修正。在核物质计算和有限核计算中比较了由Groningen势和Bonn A核子-核子(NN)势导出的DDRH顶点的性质。给出了镍和锡同位素链的结合能、电荷半径、分离能和壳层能隙的相对论Hartree结果。使用动量校正的顶点，在几个百分比的水平上获得了与数据的总体一致性。在可达的非对称性范围内，介子对自能的贡献是次要的，但可能会发生不对称相关的涨落。
Published in: Phys. Rev. C 64 (2001) , pp.034314 citations recorded in [Science Citation Index] Abstract: The density dependent relativistic hadron field (DDRH) theory is applied to strongly asymmetric nuclear matter and finite nuclei far off stability. A new set of in-medium meson-nucleon vertices is derived from Dirac-Brueckner Hartree-Fock (DBHF) calculations in asymmetric matter, now accounting also for the density dependence of isovector coupling constants. The scalar-isovector $delta$ meson is included. Nuclear matter calculations show that it is necessary to introduce a momentum correction in the extraction of coupling constants from the DBHF self-energies in order to reproduce the DBHF equation of state by DDRH mean-field calculations. The properties of DDRH vertices derived from the Groningen and the Bonn A nucleon-nucleon (NN) potentials are compared in nuclear matter calculations and for finite nuclei. Relativistic Hartree results for binding energies, charge radii, separation energies and shell gaps for the Ni and Sn isotopic chains are presented. Using the momentum corrected vertices an overall agreement to data on a level of a few percent is obtained. In the accessible range of asymmetries the $delta$ meson contributions to the self-energies are found to be of minor importance but asymmetry dependent fluctuations may occur.