The evolution of the octupole excitations with mass, charge number and the angular momentum

八极激发及其随质量A、电荷数Z和角动量I的演化是目前研究的主题。这包括激发能，电偶极跃迁和八极和四极模的相互作用。八极自由度是一种反射非对称模，在α衰变和裂变中起着重要的作用。我们的项目致力于实验数据的分析，发展新的理论方法来描述八极激发的性质，并解释相关的实验数据。我们将考虑最近在轴向形变核中观察到的长交替宇称带的性质，以及球形核中的双声子四极-八极1-态和不同核中的电偶极跃迁。我们正计划开发一个集体模型的方法来解释现有的实验数据。我们将应用微观方法的基础上的费米Q-声子形式主义。所获得的结果将用于建议新的实验。这个研究项目最终导致了对八极模在原子核结构中所起的重要作用的更深入和统一的认识。

The octupole excitations, their evolution with the mass A, the charge number Z and with the angular momentum I is the subject of the present day investigations. This includes the excitation energies, the electric dipole transitions and the interplay of the octupole and the quadrupole modes. The octupole degree of freedom being a reflection asymmetric mode plays an important role in alpha-decay and in fission. Our project is devoted to the analysis of the experimental data, to the development of new theoretical approaches to the description of the properties of the octupole excitations and to the interpretation of the relevant experimental data. We will consider the properties of the recently observed long alternating parity bands in nuclei with axial deformation, and furthermore two-phonon quadrupole-octupole 1- states in spherical nuclei and the electric dipole transitions in different nuclei. We are planning to develop a collective model approach for the interpretation of the existing experimental data. We will apply a microscopic approach based on the fermionic Q-phonon formalism. The results obtained will be used to suggest new experiments. This research project finally leads to a deeper and unifying insight into the important role which is played by the octupole mode in the structure of nuclei.