New excited 2+ and 3− two-proton states in Po126

Abstract

Five new 2 + levels have been established in the semi-magic 210 Po nucleus, from a 208 Pb(12 C, 10 Be) two-proton transfer experiment, performed at energies close to the Coulomb barrier at JAEA Tokai. A setup combining Ge, LaBr3, and Si telescopes was used to detect both in-beam gamma-rays and ejectile residues. The new 2 + states have been established by means of the transitions towards the 0 + ground state which are present in the gamma spectra produced by properly selecting the excitation energy in 210 Po after kinematical reconstruction. (f 7/2) 2 , h 9/2 ⊗ f 5/2 , (i 13/2) 2 , f 7/2 ⊗ p 3/2 and f 7/2 ⊗ f 5/2 two-proton configurations are assigned to these states. In addition, a new 3 − level has also been established in this nucleus, very likely originating from the f 7/2 ⊗ i 13/2 configuration. Shell model calculations strongly support these assignments.