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的演化是当前研究的主题。这包括激发能、电偶极子跃迁以及八极子和四极子模式的相互作用。八极自由度是一种反射不对称模，在α衰变和裂变中起着重要作用。我们的项目致力于分析实验数据，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。我们将考虑最近观测到的具有轴向变形的原子核中长交替宇称带的性质，以及球面原子核中的双声子四极-八极1态和不同原子核中的电偶极跃迁。我们计划开发一种集体模型方法来解释现有的实验数据。我们将应用基于费米子q -声子形式论的微观方法。所得的结果将用于建议新的实验。该研究项目最终对八极子模式在原子核结构中所起的重要作用有了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.