Abstract
The spectroscopy of 155Gd has been studied following Coulomb excitation. Gyromagnetic ratios were measured in the 32− [521] ground-state band by the transient field technique and the identification of states up to spin 232− in the ground-state band was confirmed by γ-γ coincidence measurements. Level lifetimes were deduced from Doppler broadened lineshapes; γ-ray branching intensities and multipolarity mixing ratios were determined from particle-γ-ray angular correlations. The population of a positive parity band (mainly 32+ [651]) by E3 Coulomb excitation from the ground-state band provides evidence of octupole correlations. Particle-rotor model calculations were performed for the negative parity states. The spectroscopy is best described when the Coriolis interactions are attenuated by ≈50%.
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