论文标题
张量分解模型，用于评估中子诱导的裂变中的同位素产率
A tensor decomposition model for evaluating isotopic yield in neutron-induced fission
论文作者
论文摘要
在用三个维度构建了851个裂变产物的三维量张量之后，并通过endf/b-viii.0数据库的独立产率数据填充张量后，张量分解算法可用于预测裂变中独立的同位素收益率，从而导致卵发率收益率张量张量张量分解（Fytd）模型。将235U和239PU的裂变产率设置为缺失值，然后预测。 FYTD模型对235U裂隙的预测与ENDF/B-VIII.0数据一致，并且比TALYS和BNN+TALYS模型的预测更好。此外，我们不仅可以预测裂缝中的质量分布，而且预测同位素的产量。对于快速中子诱导的239PU裂变，FYTD模型对同位素产量的98％预测与ENDF/B-VIII.0数据在1个数量级内的数据一致。预测ENDF/B-VIII.0数据库中不存在的238np，243m和236np的裂变产率可预测，并与Jeff-3.3数据库中的裂变和比较。良好的一致性证明了FYTD模型对目标核依赖性的预测能力。检查了在入射中子能量自由度上的屈服张量分解模型的可伸缩性。在将一组2 MeV中子诱导的239PU裂变屈服数据中添加到屈服张量中后，预计2 MeV中子诱导的裂变产率为235U和239PU。与实验数据的比较表明，预测与GEF模型在峰区域的预测相似，但在山谷区域更准确。最后，还研究了异构体状态的比率和产品的中子过量作为产品电荷数量的函数。 FYTD模型可以捕获裂变产量数据的多维依赖性并做出合理的预测。
After constructing yield tensors with three dimensions for 851 fission products and filling the tensors with the independent yield data from the ENDF/B-VIII.0 database, the tensor decomposition algorithm is applied to predict the independent isotopic yield in fission, which resulting in the Fission Yield Tensor Decomposition (FYTD) model. The fission yields of 235U and 239Pu are set as missing values and then predicted. The predictions for235U fissions by the FYTD model agree with the ENDF/B-VIII.0 data and are better than those by the Talys and BNN+Talys models. Furthermore, we predict not only the mass distribution but also the isotopic yields in the fissions. For fast neutron-induced fission of 239Pu, 98% predictions of the isotopic yields by the FYTD model agree with the ENDF/B-VIII.0 data within 1 order of magnitude. The fission yields of 238Np, 243Am, and 236Np that do not exist in the ENDF/B-VIII.0 database are predicted and compared with those in the JEFF-3.3 database, as well as the experimental data. Good agreement demonstrates the predictive ability of the FYTD model for the target nucleus dependence. The scalability of the yield tensor decomposition model over the incident neutron energy degrees of freedom is examined. After adding a set of 2 MeV neutron-induced 239Pu fission yield data into the yield tensor, the 2 MeV neutron-induced fission yields of 235U and 239Pu are predicted. The comparison with the experimental data shows that the predictions are similar to those by the GEF model in the peak area but more accurate in the valley area. Finally, the yields of the ratio of isomeric states and neutron excess of the products as a function of product charge number are also studied. The FYTD model can capture the multi-dimensional dependence of the fission yield data and make reasonable predictions.
