The transfer reaction 11B(13N, 12C)12C

The transfer reaction 11B(13N, 12C)12C* has been investigated at the two laboratory energies Elab=45 MeV and Elab=29.5 MeV. Particle-γ and particle-particle coincidences have been measured. The coincidence between a heavy ion and the 15.1 MeV γ-ray emitted from 12C* shows transition to the 12Cgs+12C*15.1 and 12C*4.44+12C*15.1 exit channels. These indicate the mixed ground-state structure of 13N. DWBA calculations have also been performed. Analysis of particle-particle coincidence data revealed the presence of transfer channels also to unbound states of 12C such as 12Cgs+12C* (E* >7.64 MeV) and 12C*4.44+12C* (E* >7.64 MeV). The angular distributions have been extracted for these two channels. Six-alpha-particle events have also been analyzed. Some of these events have been identified as coming from 11B(13N,12C*)12C* reaction. An enhancement in the six-α cross-section is observed at an excitation energy for the compound nucleus 24Mg close to the 46 MeV resonances observed in 12C+12C inelastic scattering. These six-alphas events are generated mostly from the break-up of 12C(3-1) + 12C(3-1) and therefore seems not to be associated with the six-alphas chain state.