Lifetime measurements in the yrast band of Po212 with a shell-model investigation

Abstract

The lifetimes of the first excited ${4}^{+}$ and ${6}^{+}$ states in $^{212}\mathrm{Po}$ were measured using the recoil-distance Doppler shift method. The nucleus of interest was populated in the $^{208}\mathrm{Pb}(^{18}\mathrm{O},^{14}\mathrm{C})^{212}\mathrm{Po}$ reaction. The experimental results are compared to large-scale shell model calculations performed using the recently developed H208 effective interaction. The calculations describe well the low-lying structure of $^{212}\mathrm{Po}$ with an exception of the ${2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+}$ transition rate which is strongly overestimated. This has been attributed to additional components in the wave function of the ground state.