In-beam γ -ray spectroscopy of low- and medium-spin levels in Po211

Abstract

The structure of the low-and medium-spin levels of the 211 Po nucleus have been studied with in-beam γ -ray spectroscopy with the 208 Pb(α,n) 211 Po fusion-evaporation reaction. The level scheme was further extended with levels of the configurations π (h 9/2 ) 2 2 + −4 + ⊗ νg 9/2 , π (h 9/2 ) 2 8 + ⊗ νg 9/2 , π (h 9/2 ) 2 2 + −4 + ⊗ νi 11/2 , π (h 9/2 ) 2 2 + −4 + ⊗ νj 15/2 , π (h 9/2 f 7/2 ) 8 + ⊗ νg 9/2 , and π (h 9/2 ) 2 0 + ⊗ ν(g 9/2 ) 2 0 + (s 1/2 ) −1 . The single-particle neutron states νd 5/2 and νs 1/2 were also identified. Furthermore, a number of states feeding the low-spin structures were added.