First investigation of the ²⁰⁹Bi(⁶Li, ⁷Li* → α +t) ²⁰⁸Bi* breakup channel

The (6Li, 7Li* ^ a + t) breakup channel has been investigated for the first time in an experiment with a ²⁰⁹Bi target in which the 4.63-MeV 7/2-and 6.68-MeV 5/2-resonant states of ⁷Li were well identified and extracted with the help of a large-solid-angle detector array. The angular distributions of ⁷Li* prior to its breakup were reconstructed via fragment coincidence measurements, which were well reproduced by detailed coupled discretized continuum channels (CDCC) plus coupled channel Born Approximation (CCBA) calculations. Further theoretical calculations indicate that the formation of the two resonant states of ⁷Li proceeds mainly via a two-step mechanism, driven by the coupling between the projectile excitation and single nucleon transfer.