10B direct and transfer-induced (9,11B) breakup from exclusive two- and three-fragment coincidences

Abstract

We report the identification of direct and transfer-induced breakup channels in the 10B+197Au system at nearbarrier energies based on exclusive fragment-coincidence detection. Kinematical reconstruction of two fragments, either 6Li+𝛼 or 7Li+𝛼, enables the identification of the excited states from which 10B or the one-neutron pickup ejectile 11B breaks up. Moreover, the analysis of triple coincidences 𝛼+𝛼+p reveals the cluster-structured excited states through which the breakup of the unbound one-neutron stripping ejectile 9B occurs: either 8Be+p or 𝛼+5Li.Efficiency-corrected breakup cross sections obtained individually for each state show that the latter is the main breakup mechanism in this energy regime. These exclusive measurements highlight the interplay between nuclear structure and reaction dynamics.