核力的相对论有效表述及其应用

Based on the density-dependent relativistic Hartree-Fock (DDRHF) thoeory, the project plans to develop the relativistic interpretation for the non-relativistic tensor force by analizing the tensor effects self-consistently involved by the Fock terms of meson-nucleon couplings under the diagram of meson exchange. Meanwhile the DDRHF theory will be extended to describe the deformed nuclei and the project plans to construct the axial symmetric deformed DDRHF theory by utilizing the basis expansion method. As combined with the investigations on the self-consistent tensor effects in describing finite nuclei and neutron star physics, new physical degrees of freedom will be introduced stepwise into the DDRHF framework and with the selected tensor-concerned physical observables the contributions from each meson-nucleon coupling channels will be quantitated under the diagram of meson exchange to achieve the relativistic effective interpretation of nuclear force. Based on the DDRHF theory with newly obtained effective Lagrangians, the effects from each meson-nucleon couplings,especially the tenor components self-consistently introduced by the Fock terms, will be studies systematically, e.g., in determining the nuclear shell structures, relativistic symmetry conservation and neutron star physics, to manifest the coherent physical mechanism.

项目拟基于密度依赖的相对论Hatree-Fock（DDRHF）理论，通过分析介子交换图像下各介子-核子耦合交换项自洽引入的张量耦合效应，发展非相对论的张量力的相对论表述形式。同时采用基展开的方法，将现有DDRHF理论扩展到形变原子核的应用研究中，发展建立轴对称形变的DDRHF理论。结合有限原子核与中子星物理中的自洽张量耦合效应研究，在DDRHF理论中逐步引入新的物理自由度，通过选取与张量耦合效应相关的物理观测量，定量介子交换图像下各介子-核子耦合道的贡献，实现原子核中核力的相对论有效表述。基于扩展的DDRHF理论与新的有效拉氏量，研究分析各介子-核子耦合道尤其是交换项自洽引入的张量成分对原子核壳结构、相对论对称性守恒与中子星物理的影响以明确相关的物理机制。

项目开展了原子核中核力的相对论有效表述及其应用研究，主要包括原子核中张量力的相对论表述研究、核力的相对论有效表述在球对称与形变原子核、中子星物理中的应用等。基于核力介子传递图像，项目提出RHF近似下原子核张量力的相对论表述，并探索了张量力对核物质系统和原子核结构的影响，实现核力两个重要成分——自旋-轨道耦合与张量力的统一自洽处理；项目利用核力的相对论有效表述，明确了影响新原子核壳结构的核物理机制，包括影响 Ca 同位素中新幻数产生的张量力机制、赝自旋对称性守恒与破缺导致的超重幻数结构、预言34Si中新奇的气泡结构并被实验证实；从核力的微观结构层面，结合中子星相关研究约束其高密度性质，明确与对称能相关的交换项物理，给出不同转动频率下星体自转参数的解析唯象公式；基于协变密度泛函的五维集体哈密顿量计算，明确影响形变原子核低激发谱学、形状演化、集体性等的三轴形变效应，预言丰中子核 98Sr 具有明显三轴形变，引起实验关注并被实验证实。