AI 中文总结
研究233U(n,F)等反应的瞬发裂变中子能谱，新测量的双飞行时间型能谱及重新审视的数据否定了现有评估数据，因入射中子能量范围宽致数据拟合复杂，多数情况不同能量下测量的能谱被认为不相关且少做一致分析。
AI 中文摘要
燃料和可转换核素的瞬发裂变中子能谱对现有或下一代核反应堆的安全性和效率至关重要。新测量的235U(n,f)、239Pu(n,f)和240Pu(n,f)反应的瞬发裂变中子能谱以及重新审视的数据强烈否定了现有评估中子数据库中提供的实际瞬发裂变中子能谱评估数据。原因多种多样。新测量的瞬发裂变中子能谱是双飞行时间型的。出射瞬发裂变中子聚集的入射中子能量范围相当宽，这使得通过物理建模拟合瞬发裂变中子能谱测量数据变得非常复杂，尤其是在(n,xnf)反应开始之后。在大多数情况下，在高达20 MeV的离散入射中子能量下测量的瞬发裂变中子能谱，以及用双飞行时间技术测量的能谱，被认为是不相关的，几乎从未尝试过对它们进行一致分析，只有极少数例外。
英文摘要
The prompt fission neutron spectra of fuel and fertile nuclei are of key importance for the safety/efficiency of nuclear reactors, deployed or next generation either. The newly measured prompt fission neutron spectra and revisited prompt fission neutron spectra data for 235U(n,f), 239Pu(n,f) and 240Pu(n,f) reactions strongly discard the actual prompt fission neutron spectra evaluated data provided in available evaluated neutron data libraries. The reasons for that are rather diverse. The newly measured prompt fission neutron spectra are of double time of flight type. Rather wide range of the incident neutron energies, for which the outgoing prompt fission neutrons are lumped, complicates a lot the prompt fission neutron spectra measured data fits via physical modelling, especially after the onset of the (n,xnf) reactions. In most cases the measured prompt fission neutron spectra at discrete incident neutron energies up to 20 MeV, as well as those measured with double time of flight technique were considered not correlated and their consistent analyses were almost never tried upon with rare exceptions.
Comments22 pages, 23 figures
