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从背角准弹确定54Cr+208Pb,243Am体系的势垒高度

Determining the Barrier Height of the 54Cr+208Pb and 54Cr+243Am Systems from Back-angle Quasi-elastic Scattering

    摘要
  • 摘要: 由于合成超重核的反应截面极小且超重核的半衰期较短，实验周期长且成本高昂，因此通过理论研究和间接实验方法确定合适的束流能量成为重要的前期工作。背角准弹性散射作为熔合反应的重要补充手段，能够提供关键的库仑势垒信息，为超重核合成的最佳入射能量提供重要参考。本工作搭建了由气体电离室和硅探测器组成的探测器阵列，测量了54Cr+208Pb反应的背角准弹性散射激发函数数据，得到平均势垒高度为206.27±0.62 MeV，并与已有实验数据取得了较好的一致性。此外，我们还测量了54Cr+243Am反应的背角准弹性散射实验数据，得到平均势垒高度为234.66±0.45 MeV。这些结果可为后续通过熔合反应合成Z=119号超重元素提供重要参考。

     

    Abstract: Due to the extremely small reaction cross-sections and the short half-lives of superheavy nuclei, the experimental cycles are long, and the associated costs are high. Therefore, determining the optimal beam energy through theoretical studies and indirect experimental methods is an essential preliminary task. Back-angle quasi-elastic scattering, as a critical complement to fusion reactions, provides key Coulomb barrier information, offering valuable guidance for identifying the optimal incident energy for superheavy element synthesis. In this study, we constructed a detector array consisting of a gas ionization chamber and silicon detectors. The back-angle quasi-elastic scattering excitation function for the 54Cr+208Pb reaction was measured, yielding an average barrier height of 206.27±0.62 MeV, which showed good consistency with existing experimental data. Additionally, we measured the back-angle quasi-elastic scattering experimental data for the 54Cr+243Am reaction, with an average barrier height of 234.66±0.45 MeV. These results provide valuable references for future superheavy element synthesis, including the production of Z=119.

     

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