Isospin Dependence of Nuclear Matter and Applications in Astrophysics and Nuclear Structure

核物质的同位旋依赖性及其在天体物理学和核结构中的应用

• 批准号: 5451657
• 负责人: Professor Dr. Amand Fäßler
• 金额: --
• 依托单位: Institut für Theoretische Physik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2005
• 资助国家: 德国
• 起止时间: 2004-12-31 至 2008-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5451657?language=en
• 关键词: Isospin; Dependence; Nuclear; Matter; Applications

There have been many studies of symmetric nuclear matter. Studies of asymmetric nuclear matter, however, are rare. The investigation of asymmetric matter is of importance for astrophysical studies [1,2] and for physics related to neutron-rich nuclei [3, 4, 5]. The interest for physics related to neutron-rich nuclei is only of recent date, because data for asymmetric nuclei were scarce in the past. However, this situation is changing with a new generation of high-intensity radioactive beam facilities, e.g. the future GSI facility and the Rare Isotope Accelerator (RIA) planned in the United States of America (USA). In the Tübingen theory group asymmetric nuclear matter was studied at zero temperature in the relativistic Dirac-Brueckner-Hartree-Fock approach using the Bonn A potential [6]. We suggest to further improve the work on the relativistic Dirac-Brueckner-Hartree-Fock approach to asymmetric nuclear matter by refined approximation schemes. Furthermore, we propose to study some applications using the results from the new asymmetric nuclear matter code. In astrophysics, the topics to be investigated are the mean free path of neutrinos, the symmetry energy, and the influence of the equation of state (EOS) on the bulk viscosity. In the field of nuclear physics, spinodal instabilities in asymmetric nuclear matter, and the properties of finite nuclei, such as charge radii and binding energies, are proposed to be investigated.

有许多关于对称核物质的研究。然而，对不对称核物质的研究却很少。对非对称物质的研究对于天体物理学研究[1，2]和与丰中子核有关的物理学[3，4，5]都很重要。对丰中子核物理的兴趣只是最近的日期，因为过去不对称核的数据很少。然而，随着新一代高强度放射性束设施的出现，例如美利坚合众国计划建设的未来全球空间研究所设施和稀有同位素加速器，这种情况正在发生变化。在Tübingen理论组中，使用Bonn A势在相对论性Dirac-Brueckner-Hartree-Fock方法中研究了零温度下的非对称核物质[6]。我们建议通过改进近似方案进一步改进非对称核物质的相对论性Dirac-Brueckner-Hartree-Fock方法。此外，我们建议使用新的非对称核物质代码的结果来研究一些应用。在天体物理学中，中微子的平均自由程、对称能以及物态方程对体粘滞系数的影响是研究的主要课题。在核物理领域，非对称核物质中的旋节不稳定性以及有限核的性质，如电荷半径和结合能，被提出来研究。