New electromagnetic properties of collective excitations (A07)

该项目将首次利用大体积labr闪烁体建立电子-伽马射线重合测量核结构光谱的新实验技术。在140Ce和154Sm这两个关键原子核中，将分别研究新的和尚未被探索的集体核激发的电磁特性，即低洼电偶极子激发态的横向和纵向分量以及核巨偶极子共振的伽马衰减模式。新的数据将测试现象学核模型，并挑战从头计算核结构。

The project will establish a new experimental technique for nuclear structure spectroscopy in electron-gamma-ray coincidence measurements using large-volume LaBr-scintillators for the first time. New and largely unexplored electromagnetic properties of collective nuclear excitations, namely the transversal and longitudinal components of low-lying electric dipole-excited states and the gamma-decay pattern of the nuclear giant dipole resonance, will be studied in the key nuclei 140Ce und 154Sm, respectively. The new data will test phenomenological nuclear models and challenge ab initio nuclear structure calculations.