^(136)Xe+^(208)Pb反应准裂变碎片质量分布的研究

A Study of Mass-distribution of Quasi-fission for Reaction ^(136)Xe+^(208)Pb

利用发展的两步模型,计算弹核和靶核均较重的重离子核反应136 Xe+208 Pb在相对较低入射能量下的准裂变碎片的质量分布.模型较好地给出了准裂变截面随碎片质量数的变化趋势以及峰值截面的大小,并较准确地给出了低激发能时峰值对应的碎片质量数.理论计算表明,随着入射能量的增加,准裂变碎片的截面相应增加;在液滴能的作用下,核子有向更重的靶核转移的趋势.

The mass-distributions of fragments of quasi-fission for the heavy ion reaction ^136Xe＋^208Pb are calculated at relatively low incident energies based on the developed two-step model.The varying tendency of cross section of the quasi-fission with the mass number of fragment,the cross section at peak and the location of the peak at low incident energies are well reproduced by the model.It is also shown that the cross section of the quasi-fission increases with the higher incident energies.The nucleon-transfer to heavier target is favorable in the consideration of liquid drop energy.