Two isotopically-characterized targets of high-purity (99.961±0.002%) ²³⁸U metal and a neutron dosimetry package were exposed to a pulsed neutron irradiation using the Godiva IV critical assembly at the National Criticality Experiments Research Center to measure the integral fission product yields produced in a Watt fission neutron-energy spectrum. Following irradiation, the fissioned targets were counted with two broad energy germanium detectors. Estimates of the total fissions for each target were made using measurements of well-known fission products. The total number of fissions in each target were then used to measure the fission yields of 33 fission products, 18 of which are published as new measurements. Twelve of the 18 isotopes were in agreement with ENDF/B-VIII.0 using the zeta test and treating ENDF/B-VIII.0 as the true mean: ^84mBr, ⁹³Y, ⁹⁴Y, ¹⁰⁴Tc, ¹³⁴I, ¹³⁵I, ¹³⁸Xe, ¹⁴¹Ba, ¹⁴²Ba, ¹⁴²La, ¹⁴⁶Ce, and ¹⁴⁹Nd. The ENDF/B-VIII.0 fission yield for ¹³⁹Ba was only slightly outside of 1-σ relative to the uncertainty measured in this work. Uncertainties for 5 fission product yields were markedly improved over those reported in ENDF/B-VIII.0: ¹²⁸Sn, ¹²⁹Sb, ^130gSb, ^131mTe, and ¹³³I. The fission yields measured for ¹²⁸Sn, ^131mTe, and ¹³³I were in good agreement with the ENDF/B-VIII.0 predicted fission yields. However, fission yields measurements of the isotopes ¹²⁹Sb, and ^130gSb deviated from the ENDF/B-VIII.0 value. Both of these isotopes reside near the doubly magic nuclear shell closures of 50 protons and 82 neutrons. These fission yields may be suppressed because of the odd-odd nuclear structure of ^130gSb and the odd-even structure of ¹²⁹Sb and isomer splitting. Comparisons to other recent work and a brief review with citations are included to support this conclusion.

高纯度（99.961±0.002％）的两个同位素表征目标²³⁸在国家临界实验研究中心，使用Godiva IV临界组件，将U金属和中子剂量测定包暴露于脉冲中子辐照下，以测量在瓦特裂变中子能谱中产生的整体裂变产物产率。辐照后，用两个宽能锗探测器对裂变目标进行计数。使用众所周知的裂变产物的测量值，对每个目标的总裂变进行了估算。然后，使用每个目标中的裂变总数来测量33种裂变产物的裂变产率，其中18种作为新的测量方法发表。使用zeta测试并将ENDF / B-VIII.0的真实平均值视为18n个同位素中的12个与ENDF / B-VIII.0一致：^84m Br，⁹³ Y，⁹⁴ Y，¹⁰⁴ Tc，¹³⁴ I，¹³⁵ I，¹³⁸ Xe，¹⁴¹ Ba，¹⁴² Ba，¹⁴² La，¹⁴⁶ Ce和¹⁴⁹ Nd。相对于这项工作中测得的不确定性，¹³⁹ Ba的ENDF / B-VIII.0裂变产率仅略高于1- σ。5个裂变产物的产率的不确定性对这些在ENDF / B-VIII.0报道明显改善：¹²⁸的Sn，¹²⁹锑，^130G锑，^131米Te和^133个用于测量I的裂变产率¹²⁸的Sn，^131m Te和¹³³ I与ENDF / B-VIII.0预测的裂变产率非常吻合。但是，裂变产生的同位素¹²⁹ Sb和^130g Sb的测量值偏离ENDF / B-VIII.0值。这两个同位素都位于50个质子和82个中子的双幻核壳附近。由于^130g Sb的奇偶核结构和¹²⁹ Sb的奇偶结构以及异构体分裂，这些裂变产率可能会受到抑制。与其他近期工作的比较以及对引用的简短评论也包括在内，以支持这一结论。