第一次测量到~(238)U(~9Be,5n)~(242)Cm熔合蒸发反应的激发函数。通过使用叠层靶,在不改变束流能量的条件下,在线获得20个能量点下的实验数据。利用蒸发余核~(242)Cm的半衰期较长,且衰变模式是α衰变的特点,用离线测量α放射性的方法得到目标核产额。实验最大截面约1 mb,激发函数曲线的形态和峰值所在的能量位置与现有的理论模型的计算结果一致。激发函数的实验数据对选择和优化理论模型,推动超铀核区核物理研究具有重要的意义。 The excitation function of ~ (238) U (~ 9Be, 5n) ~ (242) Cm fusion reaction was measured for the first time. By using laminated targets, experimental data were acquired online at 20 energy points without changing beam energy. By using the long half-life of ~ (242) Cm and the decay pattern of α-decay, the target nuclear yield was obtained by measuring α-radioactivity off-line. The maximum cross-section of the experiment is about 1 mb, and the shape of the excitation function curve and the energy location where the peak is located are consistent with the calculation results of the existing theoretical models. The experimental data of the excitation function are of great significance for the selection and optimization of theoretical models and the promotion of nuclear physics in the uranium nuclei.