• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>International Workshop on the New Applications of Nuclear Fission; 20030907-12; Bucharest(RO) >FISSION INVESTIGATIONS AND EVALUATION ACTIVITIES AT IRMM
【24h】

FISSION INVESTIGATIONS AND EVALUATION ACTIVITIES AT IRMM

机译：IRMM的裂变调查和评估活动

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Fission fragment properties and cross-sections have been investigated for ~(235,238)U(n,f), ~(239)Pu(n,f), ~(237)Np(n,f), ~(232)Cf(SF) and ~(233)Pa(n,f). Interpretation of the experimental results was done within the multi-modal fission model. The three most dominant fission modes were considered, the two asymmetric standard Ⅰ (S1) and standard Ⅱ (S2) modes and the symmetric superlong (SL) mode. For the evaluation the statistical model was extended to include the concept of multi-modality of the fission process. Fission mode deconvoluted fission cross-sections, neutron multiplicites and spectra for the S1, S2 and SL modes were calculated for the first time in the incident neutron energy range from 0.01 to 5.5 MeV for the isotopes mentioned above, except ~(252)Cf and ~(233)Pa. Good agreement was found with the experimental data. Additionally, branching ratios were deduced for the different modes giving the possibility to calculate fission fragment mass yield distributions at incident neutron energies, where no experimental data exist. Last but not least, the first ever direct fission cross-section measurements of ~(233)Pa were performed. The new evaluation resulted in reduced fission cross-sections as compared to evaluated libraries.
机译：研究了〜（235,238）U（n，f），〜（239）Pu（n，f），〜（237）Np（n，f），〜（232）Cf（ SF）和〜（233）Pa（n，f）。实验结果的解释是在多峰裂变模型内完成的。考虑了三个最主要的裂变模式，两个非对称标准Ⅰ（S1）模式和标准Ⅱ（S2）模式以及对称超长（SL）模式。为了评估，扩展了统计模型以包括裂变过程的多模式概念。在上述中子的入射中子能范围为0.01到5.5 MeV的范围内，首次计算了S1，S2和SL模式的裂变模式去卷积裂变截面，中子多峰和光谱，除了〜（252）Cf和〜（233）帕。发现与实验数据吻合良好。另外，推导了不同模式的分支比，从而有可能计算入射中子能量下的裂变碎片质量产率分布，而没有实验数据。最后但并非最不重要的是，进行了〜（233）Pa的首次直接裂变截面测量。与评估库相比，新评估导致裂变截面减小。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号