Lifetimes of high-spin yrast states in 154Er

Abstract

Lifetimes for high-spin levels (between about 10 and 30 ħ) in 154Er have been measured by the recoil-distance method. Non-collective, moderately collective and collective E2 transitions from states with lifetimes between at most 10 and 400 ps have been found. All available data on this nucleus are discussed within the framework of the oblate coupling scheme with the addition of collective degrees of freedom.