标题： 逐事件评估239Pu(n, f)的瞬发裂变中子谱 显示英文标题

标题： Event-by-event evaluation of the prompt fission neutron spectrum from 239Pu(n, f)

摘要： 早期对239Pu(n, f)的研究已在事件逐个裂变模型FREYA的框架内扩展到入射中子能量高达20 MeV，其中我们引入了多机会裂变和非平衡中子发射。已经确定了控制瞬发裂变中子蒸发的主要参数，并通过将这些参数拟合到ENDF-B/VII.0中的平均中子产额nubar，分析了瞬发裂变中子能谱，包括通过拟合ENDF-B/VII.0评估中使用的实验nubar数据得到的nubar(E)中的能量-能量相关性。我们展示了我们的结果，讨论了这一新评估的相关测试，并描述了可能的进一步改进。 显示英文摘要

摘要： Earlier studies of 239Pu(n, f) have been extended to incident neutron energies up to 20 MeV within the framework of the event-by-event fission model FREYA, into which we have incorporated multichance fission and pre-equilibrium neutron emission. The main parameters controlling prompt fission neutron evaporation have been identified and the prompt fission neutron spectrum has been analyzed by fitting those parameters to the average neutron multiplicity nubar from ENDF-B/VII.0, including the energy-energy correlations in nubar(E) obtained by fitting to the experimental nubar data used in the ENDF-B/VII.0 evaluation. We present our results, discuss relevant tests of this new evaluation, and describe possible further improvements.