Z > 118以上超重元素合成实验路线的探索
Exploring an experimental route of synthesizing superheavy elements beyond Z > 118
摘要：
根据实验结果，明确地研究了库仑相互作用、平均裂变度、质量不对称性和电荷不对称性参数对重元素和超重元素合成的影响。将观察到的事实分为四类，然后用于研究几个不成功的以及计划的反应，以合成新的超重元素$Z= 119, 120$。由于蒸发残渣截面数据偏差过大，很难从这些结果中得出具体的推论。结果发现，任意选择的激发能的实验研究是这样大的偏差的根本原因。利用先进的统计模型或双核系统模型，选择激发函数曲线最大处对应的激发能，通过理论激发函数研究，可以很好地解决这一复杂问题。我们相信这种方法可以帮助我们预测是否可以在现有设施的实验范围内测量的蒸发残渣截面的未来计划的反应。
英文摘要：
Role of the Coulomb interaction, mean fissility, mass asymmetry, and charge asymmetry parameters on the synthesis of heavy and superheavy elements has been examined with respect to the deformation parameters of the projectile and target nuclei explicitly in light of the experimental results. The observed facts are classified into four categories and are then used to study several unsuccessful as well as planned reactions to synthesize the new superheavy elements $Z= 119, 120$. Concrete inference is too difficult to draw from these results because of excessive deviations in evaporation residue cross-section data. It is found that the arbitrary choice of excitation energy for the experiments studied was the root cause of such large deviations. Such a complex issue can be resolved well by theoretical excitation function studies using the advanced statistical model or the dinuclear system model and choosing the excitation energy corresponding to the energy where the excitation function curve shows the maximum. We believe this method may help us to predict whether the estimated evaporation residue cross-section can be measurable within the experimental limit of the existing facilities for the future reactions planned.
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