Study on the reaction channels in the ⁶Li+⁸⁹Y system with multi-angular proton and deutron-γ coincidence analysis

The ⁶Li+⁸⁹Y experiment was conducted at the Legnaro National Laboratory in Italy to explore the influence of breakup and transfer reactions on the fusion process induced by the weakly bound projectiles. Due to the competition between neutron and proton evaporation, complete and incomplete fusion might produce identical residues, leading to the difficulties in identification of different reaction process. In this work, the High-Purity-Germanium (HPGe) detector array (GALILEO) was employed to measure γ rays, and the silicon detector array (EUCLIDES) was utilized to capture light charged particles. Exclusive measurements of prompt γ rays from residuals with various light charged particles at an energy near the Coulomb barrier are reported. In the p−γ coincident measurements, observed ⁹¹Nb, ⁹²Nb, and ⁹³Nb is considered from neutron evaporation channel in complete fusion reaction, and ⁹⁰Y is generated through 1n stripping reaction. A two-step, breakup followed by fusion, in case of the capture of α is inferred to be the dominant mechanism to yield the ⁹²Nb and ⁹¹Nb in the deutron coincident exclusive measurement.