14.7 MeV中子引起~(238)U裂变的电荷分布

    CHARGE DISTRIBUTION IN THE FISSION OF ~(238)U BY 14.7 MEV NEUTRON

    • 摘要: 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。

       

      Abstract: Independent yields of 82Br, 132I, 136Cs, 140La and the cumulative yields of 95Zr, 97Zr, 99Mo, 131I, 134I, 135I, 138Cs, 142La in the fission of 238U induced by neutrons of 14.7 MeV were determined by radiochemical methods. The correlation of independent yields with a Gaussian curve of charge distribution was investigated using various mass formulae, neutron emission functions and charge distribution hypotheses. The results seem to indicate that both the hypothesis of minimum potential energy with a non-shell-effected mass equation and the hypothesis of equal charge displacement with a shell-effected equation gave almost equal best fits to the data. The Gaussian curve of the charge distribution and AZ, the deviation of the experimental value of the most probable charge from the constant charge density obtained in our experiments were found to be in agreement with those in the fission of 235U induced by thermal neutrons.

       

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