发表机构
Odessa National Polytechnic University（敖德萨国立理工大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究利用蒙特卡罗模拟，探究了非均匀铀-碳和钍-碳裂变介质中的慢化中子能谱，发现可形成快、热及超热谱，为行波反应堆设计提供依据。
AI 中文摘要
利用Geant4和OpenMC蒙特卡罗程序，研究了均匀二碳化铀和二氧化铀介质以及具有不同组成和晶格参数的非均匀铀-碳和钍-碳通道型裂变结构中的慢化中子能谱。在均匀二碳化铀中，谱最大值位于20至50 keV范围内，这对于设计以软快中子谱行波裂变模式运行的原型快中子单通道反应堆具有重要意义。确定了一种形成热中子谱的非均匀钍-碳介质，使得在热中子上实现中子核裂变的行波模式成为可能。通过改变通道晶格参数并引入可燃毒物（Cd、In），证明了在非均匀铀-碳介质中形成超热中子谱（1至20 eV）的可能性。这些结果对于核嬗变反应堆和以行波模式运行的下一代反应堆的开发具有实用价值。
英文摘要
Using the Geant4 and OpenMC Monte Carlo codes, the energy spectra of moderated neutrons were studied in homogeneous uranium dicarbide and uranium dioxide media, as well as in heterogeneous uranium and carbon and thorium and carbon channel type fission structures with various compositions and lattice parameters. In homogeneous uranium dicarbide the spectral maximum lies in the from 20 to 50 keV range, which is important for the design of a prototype fast single channel reactor operating in the traveling wave fission mode with a soft fast neutron spectrum. A heterogeneous thorium and carbon medium that forms a thermal neutron spectrum has been identified, enabling the realization of a traveling wave mode of neutron nuclear fission on thermal neutrons. By varying channel lattice parameters and introducing burnable absorbers (Cd, In), the possibility of forming a super thermal neutron spectrum (from 1 to 20 eV) in a heterogeneous uranium and carbon medium was demonstrated. The results are useful for the development of nuclear transmutation reactors and next generation reactors operating in the traveling wave mode.
Comments13 pages, 13 figures
