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在14.7兆电子伏中子引起~(238)U裂变中,用放射化学方法测定了~(82)Br、~(132)I、~(136)Cs、~(140)La4个独立产额以及~(95)Zr、~(97)Zr、~(99)Mo、~(131)I、~(133)I、~(134)I、~(135)I、~(138)Cs、~(142)La等9个累积产额。实验测定的独立产额和其他文献报道的~(96)Nb、~(139)Cs、~(139)Ba一共7个独立产额用高斯电荷分布曲线进行了关联,计算中采用了各种质量公式、电荷分布假设和中子发射函数。结果指出,使用不考虑壳效应的Grenn质量公式的最小位能假设以及考虑壳效应的Coryell质量公式的等电荷位移假设给出几乎同样的最佳拟合,得到的电荷分布曲线以及实验的最可几电荷Z_p对恒电荷密度的迁移ΔZ都和~(235)U的热中子裂变实验结果相一致。
In the ~ (238) U fission induced by 14.7 MeV neutron, four independent yield of ~ (82) Br, ~ (132) I, ~ (136) Cs and ~ (140) La were measured by radiochemical method and ~ (95) Zr, ~ (97) Zr, ~ (99) Mo, ~ 131 I, ~ 133 I, ~ 134 I, ~ 135 I, ~ 138 Cs, 142) La and other nine cumulative yield. The experimentally determined independent yields were correlated with the reported independent (96) Nb, ~ (139) Cs, ~ (139) Ba independent outputs of seven independent variables with Gaussian charge distribution curves, using various masses Formula, charge distribution assumption and neutron emission function. The results indicate that the assumption of minimum potential energy using the Grenn mass formula without shell effect and the equipotential displacement assumption of the Coryell mass formula taking into account the shell effect give almost the same best fit, The migration of several charge Z_p to constant charge density ΔZ is consistent with the experimental results of thermal neutron fission of ~ (235) U.