Comparative study of the effect of resonances of the weakly bound nuclei Li-6,Li-7 on total fusion with light to heavy mass targets

摘要

A systematic study of total fusion involving the weakly bound nuclei Li-6,Li-7 with several light to heavy mass targets at Coulomb energies is presented. Emphasis is given to the role of resonance states (l = 2, J(pi) = 3(+), 2(+), 1(+) of Li-6 and l = 3, J(pi) = 7/2(-), 5/2(-) of Li-7) on the total fusion excitation function. A comparative analysis of the effects of resonant breakup on total fusion is performed for both projectiles, using the continuum-discretized coupled-channel (CDCC) framework. The calculations demonstrate that (i) resonant breakup couplings play a more important role in total fusion than nonresonant couplings, (ii) resonance states with short half-lives are very important for total fusion, as incident energies decrease toward the Coulomb barrier energy where incomplete fusion dominates, and (iii) resonance states with long half-life act as quasibound inelastic states, playing a crucial role in complete fusion.