弱束缚弹核引起的熔合反应

Fusion Reactions Induced by Weakly Bound Projectile

6Li,9Be为弱束缚核.通过弱束缚弹核6Li,9Be轰击靶核208Pb,208Be的实验熔合激发函数与理论预言的比较,讨论了弱束缚弹核破裂对熔合过程的影响.比较结果显示,弱束缚弹核与重靶核的完全熔合截面在垒上能区明显压低.由部分熔合截面与完全熔合截面之和得到总熔合截面.研究结果表明, 破裂对总熔合截面几乎没有影响.由此可见,弱柬缚核的部分熔合可能发生在强吸收区域附近.最后还给出了全熔合截面与部分熔合截面之间的关系.

The effect of breakup on fusion for weakly bound projectiles ^6Li and ^9Be incident on ^208pb or ^209Bi targets has been discussed by comparing experimental fusion excitation functions to the prediction of stranded theory. It is shown intuitively by this comparison that complete fusion of weakly bound projectile with heavy target is suppressed, whereas breakup has every little effect on the total fusion at energies above the barrier. The result indicates that partial fusion of weakly bound nuclei most likely takes place near the absorption region. By means of our observation, we have put forward a relationship between the cross sections of complete fusion and partial fusion.