Disentangling reaction mechanisms for alpha production in the Li-6+Bi-209 reaction

作者：Santra S^*; Kailas S; Parkar V V; Ramachandran K; Jha V; Chatterjee A; Rath P K; Parihari A

来源：Physical Review C, 2012, 85(1): 014612.

DOI：10.1103/PhysRevC.85.014612

Inclusive breakup alpha cross sections (sigma(incl)(alpha)) are measured for the Li-6 + Bi-209 reaction at bombarding energies E-lab = 24-50 MeV. The sigma(incl)(alpha) was observed to be a substantial fraction of the total reaction cross section over the entire energy range, and it exhausts almost whole of the reaction cross section at sub-barrier energies. An investigation on the origin of large inclusive alpha reveals that most of the alpha particles are produced by noncapture breakup (Li-6 -> alpha + d) and incomplete fusion via d capture. The combined cross sections of noncapture breakup, d capture, and transfer reactions successfully explain the origin of most of the experimental sigma(incl)(alpha) over the measured energy range. A comparison of the sigma(incl)(alpha) versus reduced energies for several targets involving Li-6 as projectile shows that the cross sections are independent of target. Interestingly, the difference between reaction and complete fusion cross sections "sigma(reac) - sigma(CF)" for several reactions also shows the same behavior.

• 出版日期2012-1-30