New electromagnetic properties of collective excitations (A07)

该项目将建立一种新的实验技术，用于首次使用大体积LaBr-吸收器进行电子-伽马射线符合测量的核结构光谱学。集体核激发的新的和很大程度上未探索的电磁特性，即低洼电偶极激发态的横向和纵向分量和核巨偶极共振的伽马衰变模式，将分别在关键核140 Ce和154 Sm中进行研究。新的数据将测试唯象核模型和挑战从头计算核结构计算。

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.