SPECTROSCOPY OF RN-211 APPROACHING THE VALENCE LIMIT

High-spin states in Rn-211 were populated using the reaction Pt-198(O- 18, 5n) at 96 MeV. Their decay was studied using gamma-ray and electro n spectroscopy. The known level scheme is extended up to a spin of gre ater than 69/2 and many non-yrast states are added. Semi-empirical she ll-model calculations and the properties of related states in Rn-210 a nd Rn-212 are used to assign configurations to some of the non-yrast s tates. The properties of the high-spin states observed are compared to the predictions of the multi-particle octupole-coupling model and the semi-empirical shell model. The maximum reasonable spin available fro m the valence particles and holes in 77/2 and states are observed to n ear this limit.