B11+α→α+α+Li7 Reaction at 28.5 MeV

Angular correlations between two alpha particles emitted from the reaction B 11 +α→α+α+Li 7 are studied at the incident energy of 28.5 MeV. The kinematics of the final state were completely determined by measuring the momenta of two alpha particles detected in coincidence. The reaction cross sections are dominated by two body interactions between two alpha particles and between alpha particle and Li 7 nucleus. Interferences among two body interactions are observed at the overlapping of two body resonances. This is discussed to be due to the fact that three bodies interact in the final state.