Abstract
The development of fourth-generation reactors and advanced nuclear energy systems require high-precision, multi-nuclide, and wide-energy-area neutron nuclear data. However, the current nuclear energy-related nuclear fission data in the China Nuclear Data Evaluation Library (CENDL library) are incomplete and cannot meet the current need. It is extremely important to establish the reliable calculation methods and tools for the neutron nuclear data. Based on the Monte-Carlo method, a model for calculating the pre-neutron fission fragment is established in this work. The mass and kinetic energy distribution of <sup>232</sup>Th(n,f) reaction at the medium- and low- incident neutron energy are studied. The calculations of the mass distribution with the different values of incident energy are compared with the experimental results. The maximum deviation of this work from the experimental data is ~1%, which is advantageous compared with the GEF and TALYS code (maximum deviation from the experimental value is ~2%). The calculation of the pre-neutron fission fragment kinetic energy also shows good agreement with experimental result. The results indicate that this model can well describe and predict the characteristics of pre-neutron fission fragment for <sup>232</sup>Th(n,f) reaction at the medium- and low- incident neutron energy. It also provides a new idea for calculating the neutron-induced actinide fission reactions.
Highlights
The gray layer is the fissile sample of the actinide target, while the yellow one is the backing support for the sample
FF1 and FF2 respectively denote the fragments emitted from the different sides. q1 and q2 are the angles of the fragment axis relative to the axial direction of the incoming neutron
1) (School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China) 2) (Engineering Research Center for Neutron Application, Ministry of Education, Lanzhou University, Lanzhou 730000, China)
Summary
图 1 Geant 几何模型示意图. 灰色区域代表锕系核素样 品 (Sample), 黄色区域代表衬底 (Backing). 面向入射中子 一侧为样品侧 (Sample side), 远离入射中子一侧为衬底侧 (Backing side). 面向入射中子 一侧为样品侧 (Sample side), 远离入射中子一侧为衬底侧 (Backing side). FF1 和 FF2 分别代表一对互补裂变碎片, 并 且它们穿出靶的角度分别为 q1 和 q2 Fig. 1. Schematic illustration of the Geant geometric model. The gray layer is the fissile sample of the actinide target, while the yellow one is the backing support for the sample. The sample side faced the impinging neutrons. FF1 and FF2 respectively denote the fragments emitted from the different sides. Q1 and q2 are the angles of the fragment axis relative to the axial direction of the incoming neutron. 图 3 给出 了入射中子能量 (表示为 En ) 为 3, 6, 10 MeV 时, 012501-2 Geant 物理模型能够较好地描述该过程 [30−32]. 图 3 给出 了入射中子能量 (表示为 En ) 为 3, 6, 10 MeV 时, 012501-2
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