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arXiv 0912.4069nucl-th
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用$^{238}$ U、$^{244}$ Pu和$^{248,250}$ Cm靶制备Z=108-114的新超重核

Production of new superheavy Z=108-114 nuclei with $^{238}$U, $^{244}$Pu and $^{248,250}$Cm targets

Zhao-Qing Feng, Gen-Ming Jin, Jun-Qing Li

摘要:

在双核系统(DNS)模型的框架下,系统地分析了荷电数Z=108-114的新超重核的产生截面。指出了以锕系核素$^{238}$ U、$^{244}$ Pu和$^{248,250}$ Cm为基础的具有最佳激发能和蒸发通道的可能组合,用于合成介于冷聚变和$^{48}$ Ca诱导聚变反应之间的新同位素,实验上是可行的。结果表明,超重核的产生截面随复合核荷电数的增加而急剧减小。入口通道的较大质量不对称性增强了2n-5 n通道中的截面。

英文摘要:

Within the framework of the dinuclear system (DNS) model, production cross sections of new superheavy nuclei with charged numbers Z=108-114 are analyzed systematically. Possible combinations based on the actinide nuclides $^{238}$U, $^{244}$Pu and $^{248,250}$Cm with the optimal excitation energies and evaporation channels are pointed out to synthesize new isotopes which lie between the nuclides produced in the cold fusion and the $^{48}$Ca induced fusion reactions experimentally, which are feasible to be constructed experimentally. It is found that the production cross sections of superheavy nuclei decrease drastically with the charged numbers of compound nuclei. Larger mass asymmetries of the entrance channels enhance the cross sections in 2n-5n channels.

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