One-neutron stripping process in the 209Bi(6Li, 5Li)210Bi* reaction reaction

Abstract

One-neutron stripping process between 6 Li and 209 Bi was studied at 28, 30, and 34 MeV using the in-beam -ray spectroscopy method. The – coincident analysis clearly identified two -rays feeding the ground and long-lived isomeric states, which were employed to determine the cross section. The one-neutron stripping cross sections were similar to the cross sections of complete fusion in the 6Li+209 Bi system, but the one-neutron stripping cross sections decreased more gradually at the sub-barrier region. A coupled-reaction-channel calculation was performed to study the detailed reaction mechanism of the one-neutron stripping process in 6Li. The calculations indicated that the first excited state of 5 Li is critical in the actual one-neutron transfer mechanism, and the valence proton of 209 Bi can be excited to the low-lying excited state in (6 Li,5 Li) reaction, unlike in the (d,p) reaction.