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arXiv 1109.2013nucl-th
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超重元素$Z$ =120合成中的入射通道和fission势垒效应

Effects of the entrance channel and fission barrier in synthesis of superheavy element $Z$=120

A. K. Nasirov, G. Mandaglio, G. Giardina, A. Sobiczewski, A. I. Muminov

摘要:

比较了用组合双核系统和先进统计模型计算的$^{50}$ Ti+ $^{249}$ Cf和$^{54}$ Cr+ $^{248}$ Cm反应的熔合和蒸发残余截面。这些反应被认为是用来合成最重的超重元素。$^{50}$ Ti+ $^{249}$ Cf反应比$^{54}$ Cr+ $^{248}$ Cm反应具有更大的质量不对称性,前者的熔合激发函数高于后者.与$^{54}$ Cr+ $^{248}$ Cm反应相比,质量不对称反应的蒸发残渣激发函数更高.与使用Peter Möller { \it et al}计算的质量的情况相比,使用华沙小组在宏观-微观模型框架内计算的超重核质量值导致两个反应的蒸发残余截面较小。与$^{54}$ Cr+ $^{248}$ Cm反应相比,$^{50}$ Ti+ $^{249}$ Cf反应更有利:对于$^{50}$ Ti+ $^{249}$ Cf和$^{54}$ Cr+ $^{248}$ Cm反应,蒸发残渣形成的3 n-沟道的激发函数的最大值分别为约0.1和0.07 pb,但前一反应的4 n沟道产率(0.004Pb)低于后一反应的产率(0.01Pb)。

英文摘要:

The fusion and evaporation residue cross sections for the $^{50}$Ti+$^{249}$Cf and $^{54}$Cr+$^{248}$Cm reactions calculated by the combined dinuclear system and advanced statistical models are compared. These reactions are considered to be used to synthesize the heaviest superheavy element. The $^{50}$Ti+$^{249}$Cf reaction is more mass asymmetric than $^{54}$Cr+$^{248}$Cm and the fusion excitation function for the former reaction is higher than the one for the latter reaction. The evaporation residue excitation functions for the mass asymmetric reaction is higher in comparison with the one of the $^{54}$Cr+$^{248}$Cm reaction. The use of the mass values of superheavy nuclei calculated in the framework of the macroscopic-microscopic model by the Warsaw group leads to smaller evaporation residue cross section for both the reactions in comparison with the case of using the masses calculated by Peter Möller {\it et al}. The $^{50}$Ti+$^{249}$Cf reaction is more favorable in comparison with the $^{54}$Cr+$^{248}$Cm reaction: the maximum values of the excitation function of the 3n-channel of the evaporation residue formation for the $^{50}$Ti+$^{249}$Cf and $^{54}$Cr+$^{248}$Cm reactions are about 0.1 and 0.07 pb, respectively, but the yield of the 4n-channel for the former reaction is lower (0.004 pb) in comparison with the one (0.01 pb) for the latter reaction.

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