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首页> 外文期刊>Nuclear Instruments & Methods in Physics Research. B, Beam Interactions with Materials and Atoms >Monte Carlo models for the production of β-delayed gamma-rays following fission of special nuclear materials
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Monte Carlo models for the production of β-delayed gamma-rays following fission of special nuclear materials

机译：蒙特卡洛模型，用于在特殊核材料裂变后产生β延迟的γ射线

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摘要

A Monte Carlo method for the estimation of β-delayed γ-ray spectra following fission is described that can acco-modate an arbitrary time-dependent fission rate and photon collection history. The method invokes direct sampling of the independent fission yield distributions of the fissioning system, the branching ratios for decay of individual fission products and the spectral distributions for photon emission for each decay mode. Though computationally intensive, the method can provide a detailed estimate of the spectrum that would be recorded by an arbitrary spectrometer, and can prove useful in assessing the quality of evaluated data libraries, for identifying gaps in these libraries, etc. The method is illustrated by a first comparison of calculated and experimental spectra from decay of short-lived fission products following the reactions ~(235)U(n_(th),f) and ~(239)Pu(n_(th),f). For general purpose transport calculations, where detailed consideration of the large number of individual γ-ray transitions in a spectrum may be unnecessary, it is shown that an accurate and simple parameterization of a γ-ray source function can be obtained. These parametrizations should provide high-quality average spectral distributions that should prove useful in calculations describing photons escaping from thick attenuating media.
机译：描述了一种蒙特卡罗方法，用于估计裂变后的β延迟γ射线光谱，该方法可以适应随时间变化的任意裂变率和光子收集历史。该方法调用了裂变系统的独立裂变产量分布，各个裂变产物衰变的分支比以及每种衰变模式下光子发射的光谱分布的直接采样。尽管计算量大，但是该方法可以提供将由任意光谱仪记录的光谱的详细估计，并且可以证明对评估评估数据库的质量，识别这些库中的缺口等有用。根据〜（235）U（n_（th），f）和〜（239）Pu（n_（th），f）的反应，由短期裂变产物的衰变计算和实验光谱的第一比较。对于通用传输计算，在其中可能不需要详细考虑光谱中大量单个γ射线跃迁的情况下，已表明可以获得γ射线源函数的准确且简单的参数化。这些参数化应提供高质量的平均光谱分布，在描述从厚衰减介质逃逸的光子的计算中应被证明是有用的。

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