Prompt emission in fission induced with fast neutrons
Prompt emission in fission induced with fast neutrons
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快中子诱发裂变中的瞬发发射
DOI：
10.1016/j.phpro.2015.04.014
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A. Oberstedt
中科院分区：
文献类型：
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作者：
J. Wilson;M. Lebois;P. Halipré;S. Oberstedt;A. Oberstedt
裂变瞬发γ射线和中子发射数据综合了裂变过程的大量信息，可以揭示裂变过程的能量分配。测量的发射光谱、平均能量和多重性也为能源应用提供了重要信息。虽然目前的反应堆主要使用热中子谱，未来的第四代反应堆将使用快中子谱，其中很少有实验提示发射数据存在。在快中子引起的裂变的提示发射的初步调查最近已经进行了在LICORNE设施在IPN奥赛，利用逆反应产生自然准直，强烈的中子束。本文报道了用LICORNE测量235U和238U瞬发裂变γ射线谱、平均能量和多重数的初步结果。目前正在进行的改进和升级的LICORNE设施也将被描述，包括一个H2气体目标的发展，以减少寄生背景和增加强度，和11B束的部署，以扩大有效的LICORNE中子能量范围高达12兆电子伏。展望了快中子裂变瞬发γ射线和中子辐射的实验研究。
Prompt gamma-ray and neutron emission data in fission integrates a large amount of information on the fission process and can shed light on the partition of energy. Measured emission spectra, average energies and multiplicities also provide important information for energy applications. While current reactors mostly use thermal neutron spectra, the future reactors of Generation IV will use fast neutron spectra for which little experimental prompt emission data exist.Initial investigations on prompt emission in fast neutron induced fission have recently been carried out at the LICORNE facility at the IPN Orsay, which exploits inverse reactions to produce naturally collimated, intense beams of neutrons. We report on first results with LICORNE to measure prompt fission gamma-ray spectra, average energies and multiplicities for235U and238U. Current improvements and upgrades being carried out on the LICORNE facility will also be described, including the development of a H2 gas target to reduce parasitic backgrounds and increase intensities, and the deployment of11B beams to extend the effective LICORNE neutron energy range up to 12 MeV. Prospects for future experimental studies of prompt gamma-ray and neutron emission in fast neutron induced fission will be presented.