Abstract
The lifetime of the yrast 15 2 − state in 215Ra was measured using pulsed beams and γ-ray and electron techniques. Transition multipolarities were established from measured conversion coefficients. The B(E3) of the 15 2 −→ 9 2 + transition is found to be considerably larger than previously reported. A candidate for the corresponding transition in 217Th was also observed. The E3 strength of the 15 2 −→ 9 2 + transition in the N = 127 isotones is evaluated in the light of these and other recent results. Interpretation in the framework of particle-octupole vibration coupling requires a systematic lowering of the core 3 − vibration as proton pairs are added to 208Pb.
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