发表机构
Institute for Nuclear Research of the Russian Academy of Sciences（俄罗斯科学院核物理研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出基于Geant4建模的三Gamma函数模型来确定RADEX中子源的时间分辨函数，验证其在50–300 eV能量范围的适用性，并推广至n_TOF源。
AI 中文摘要
时间分辨函数是决定飞行时间实验中子共振参数重建精度的关键因素之一。本文提出了一种基于详细Geant4建模来确定RADEX中子源时间分辨函数的方法，该函数与中子在中子靶中的慢化过程相关。Geant4模拟得到的中子时间谱通过三个具有无量纲参数的Gamma函数的和进行近似。研究表明，该模型能够很好地描述50–300 eV中子能量范围内的时间分布形状。为测试所提方法对另一种设计的中子源的适用性，与计算得到的n_TOF时间分辨函数进行了比较。结果表明，其形状也能由三组分Gamma模型很好地描述。
英文摘要
The time-resolution function is one of the key factors determining the accuracy of neutron-resonance parameter reconstruction in time-of-flight experiments. A method is proposed for determining the time-resolution function of the RADEX neutron source associated with neutron slowing down in the target, based on detailed Geant4 modeling. The neutron time spectra obtained in the Geant4 simulations are approximated by a sum of three Gamma functions with dimensionless parameters. This model is shown to describe the shape of the time distributions well over the neutron-energy range 50--300 eV. To test the applicability of the proposed approach to a source of a different design, a comparison is made with the calculated n\_TOF time-resolution function. Its shape is also shown to be well described by a three-component Gamma model.
Comments10 pages, 5 figures
