Lifetime measurements in the yrast band of Po-212 with a shell-model investigation

The lifetimes of the first excited 4(+) and 6(+ )states in Po-212 were measured using the recoil-distance Doppler shift method. The nucleus of interest was populated in the Pb-208(O-18, C-14)Po- 212 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)Po with an exception of the 2(1)(+) -> 0(1 )(+)transition rate which is strongly overestimated. This has been attributed to additional components in the wave function of the ground state