Bayesian evaluation of charge yields of fission fragments of U239

• DOI: 10.1103/physrevc.103.034621
• Publication Date: 2021-03-29T14:28:19Z
• Authors: C. Y. Qiao; J. C. Pei; Z. A. Wang; Y. Qiang; Y. J. Chen; N. C. Shu; Z. G. Ge
• Keywords: Nuclear Theory (nucl-th); Nuclear Theory; 0103 physical sciences; FOS: Physical sciences; 01 natural sciences

5 pages, 4 figures<br/>Recent experiments [Phys. Rev. Lett. 123, 092503(2019); Phys. Rev. Lett. 118, 222501 (2017)] have made remarkable progress in measurements of the isotopic fission-fragment yields of the compound nucleus $^{239}$U, which is of great interests for fast-neutron reactors and for benchmarks of fission models. We apply the Bayesian neural network (BNN) approach to learn existing evaluated charge yields and infer the incomplete charge yields of $^{239}$U. We found the two-layer BNN is improved compared to the single-layer BNN for the overall performance. Our results support the normal charge yields of $^{239}$U around Sn and Mo isotopes. The role of odd-even effects in charge yields has also been studied.<br/>