Electric dipole excitations and related structures in atomic nuclei

形成原子核的质子和中子之间的对称性是核物理学的一个重要组成部分，它对我们对这些介观量子系统的看法有着重要的影响。研究原子核束缚态之间的电偶极子跃迁是进一步了解这种对称性破缺的一种方法。本课题的研究主题是研究中重和重原子核中直至粒子阈值的电偶极激发和相关结构，以及在不同核模型范围内的解释。为此，计划使用从重离子到光子的各种互补实验探针进行研究，并使用各种技术提取最具启发性的观测结果。实验的主要部分将在科隆大学的串联离子加速器上进行，额外的信息将来自达姆施塔特工业大学、格罗宁根大学、MLL m<s:1> nchen大学和HIGS杜克大学的实验设施。

The symmetry between protons and neutrons forming atomic nuclei is a crucial ingredient of nuclear physics which has significant consequences for our view of these mesoscopic quantum systems. The study of electric dipole transitions between bound states in nuclei is one approach to learn more about the breaking of this symmetry. The topic of the proposed research project is the investigation of electric dipole excitations and related structures up to the particle threshold in medium heavy and heavy atomic nuclei and their interpretation within the scope of different nuclear models. For this purpose it is planned to perform studies with various complementary experimental probes from heavy ions to photons and to use a variety of techniques to extract the most revealing observables. The major part of the experiments will be conducted at the tandem ion accelerator at the University of Cologne, additional information will come from experimental facilities at TU Darmstadt, KVI Groningen, MLL München and HIGS Duke University.