The technique for estimating the incident neutron energy distribution from emitted prompt gamma intensities from a system placed in a neutron field is validated using experimental data. A cylinder of high density polyethylene (HDPE) kept inside another cylinder of borated HDPE (BHDPE) placed in a neutron beam and the prompt gamma emissions are detected using a lead shielded NaI(Tl) detector based spectrometer system. The experiments were carried with an isotopic ²⁴¹Am-Be neutron source kept inside a thick concrete bunker. The measured photo peak intensities are used to unfold the incident neutron energy distribution using the calculated response functions of the system and the genetic algorithm based Monte Carlo de-convolution code GAMCD. The technique could successfully unfold the neutron spectra above 1 MeV and estimate the integral neutron fluence below 1 MeV. The covariance and the correlation matrices involving the energy groups in the solution spectrum were computed using the results from different Monte Carlo histories.

使用实验数据验证了从放置在中子场中的系统发射的瞬发伽马强度估算入射中子能量分布的技术。一个高密度聚乙烯（HDPE）圆柱体放置在另一个置于中子束中的硼酸化HDPE（BHDPE）圆柱体内部，并且使用基于铅屏蔽NaI（Tl）探测器的光谱仪系统检测了迅速的伽马发射。实验用同位素^241进行Am-Be中子源保存在一个厚混凝土掩体中。使用系统计算出的响应函数和基于遗传算法的蒙特卡洛反卷积码GAMCD，可将测得的光峰强度用于展开入射中子能量分布。该技术可以成功地展开1 MeV以上的中子谱，并估计1 MeV以下的中子积分通量。使用来自不同蒙特卡洛历史的结果，计算了涉及解决方案谱中的能量组的协方差和相关矩阵。