用GRAVEL方法展开BC501A液体闪烁探测器的快中子能谱
Unfolding the fast neutron spectra of a BC501A liquid scintillation detector using GRAVEL method
摘要：
中子能谱的精确知识在基础研究和应用中是有用的。介绍了用BC 501 A液体闪烁探测器测量和展开快中子能谱的全过程。实验测量了Am-Be中子的反冲质子谱。利用NND 7程序对探测器的响应矩阵进行了模拟。结合反冲质子能谱和响应矩阵，采用GRAVEL迭代算法对中子能谱进行展开。开发了基于GRAVEL方法的MatLab程序。成功地展开了Am-Be源的连续中子能谱和D-T源的单能中子能谱，并与标准参考谱符合良好。展开的Am-Be谱比近年来人工神经网络展开的Am-Be谱更精确。
英文摘要：
Accurate knowledge of the neutron energy spectra is useful in basic research and applications. The overall procedure of measuring and unfolding the fast neutron energy spectra with BC501A liquid scintillation detector is described. The recoil proton spectrum of Am-Be neutrons was obtained experimentally. With the NRESP7 code, the response matrix of detector was simulated. Combining the recoil proton spectrum and response matrix, the unfolding of neutron spectra was performed by GRAVEL iterative algorithm. A MatLab program based on the GRAVEL method was developed. The continuous neutron spectrum of Am-Be source and monoenergetic neutron spectrum of D-T source have been unfolded successfully and are in good agreement with their standard reference spectra. The unfolded Am-Be spectrum are more accurate than the spectra unfolded by artificial neural networks in recent years.
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