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 \(\gamma \)-ray spectroscopy method. The \(\gamma \)–\(\gamma \) coincident analysis clearly identified two \(\gamma \)-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 \(^6\)Li+\(^{209}\)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 \(^6\)Li. 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 \(^{209}\textrm{Bi}\) can be excited to the low-lying excited state in (\(^{6}\textrm{Li}\),\(^{5}\textrm{Li}\)) reaction, unlike in the (d,p) reaction.