The cumulative yields of various short and relative long-lived fission products within the mass range of 80–115 and 123–157 have been measured in the epi-cadmium neutron induced fission of 99.9997 atom % ²³⁸U, by using an off-line γ-ray spectrometric technique. The mass chain yields were obtained from the cumulative yields by applying the charge distribution correction. The present and earlier data in the ²³⁸U(n, f) reaction was compared with the similar data of ²³²Th(n, f) reaction. In the ³⁸U(n, f) reaction, the yields around the mass range 134–138 and their complementary are higher than the other fission products, which indicate the favorable standard I asymmetric mode of fission. On the other hand, in the ²³²Th(n, f) reaction, the yields around 139–144 and their complementary are higher than the other fission products, which indicate the favorable standard II asymmetric mode of fission.

在 99.9997 atom % ²³⁸ U的外镉中子诱导裂变中，使用离线 γ测量了质量范围为 80-115 和 123-157 的各种短寿命和相对长寿命裂变产物的累积产率-射线光谱技术。通过应用电荷分布校正从累积产率获得质量链产率。将²³⁸ U(n, f) 反应的当前和早期数据与²³² Th(n, f) 反应的类似数据进行比较。在³⁸ U(n, f) 反应中，质量范围 134-138 及其互补的产率高于其他裂变产物，这表明有利的标准 I 不对称裂变模式。另一方面，在²³²Th(n, f)反应，139-144附近的产率及其互补比其他裂变产物高，这表明有利的标准II不对称裂变模式。