冷中子反射体材料中子散射核的发展
Development of neutron scattering kernels for cold neutron reflector materials
摘要：
最新的中子散射应用是高度强度限制的技术，要求减少源和探测器之间的中子损失。此外，核工业需要更准确的数据和程序来设计和优化先进的裂变反应堆，特别是处理燃料和慢化剂材料。为了满足这些要求，有必要改进现有的计算工具，通过生成更好的模型来描述中子与感兴趣的系统的相互作用。巴里洛切原子能中心（阿根廷国家原子能机构）的中子物理系一直在开发慢中子与材料相互作用的新模型，以产生热和冷中子能量区的散射核和截面数据。除了对中子减速剂进行的研究外，我们最近开始研究在这些能量范围内可以作为有效中子反射体的材料。在这项工作中，我们提出了金刚石纳米粉末和氢化镁，同时进行VESUVIO光谱仪（ISIS，英国）的传输和散射实验的结果，并将它们与新生成的横截面库进行比较。
英文摘要：
The newest neutron scattering applications are highly intensity-limited techniques that demand reducing the neutron losses between source and detectors. In addition, the nuclear industry demands more accurate data and procedures for the design and optimization of advanced fission reactors, especially for the treatment of fuel and moderator materials. To meet these demands, it is necessary to improve the existing calculation tools, through the generation of better models that describe the interaction of neutrons with the systems of interest. The Neutron Physics Department at Centro Atomico Bariloche (CNEA, Argentina) has been developing over the time new models for the interaction of slow neutrons with materials, to produce scattering kernels and cross section data in the thermal and cold neutron energy region. Besides the studies carried out on neutron moderators, we have recently begun looking at materials that could serve as efficient neutron reflectors over those energy ranges. In this work we present the results of transmission and scattering experiments on diamond nanopowder and magnesium hydride, carried out simultaneously at the VESUVIO spectrometer (ISIS, UK), and compare them with newly generated cross-section libraries.
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