热中子诱发^(239)Pu裂变气体产物核Xe产额的评价  

Yield evaluation for gas products of Xe isotopes from^(239)Pu fission induced by thermal neutrons

作　　者：刘玲[1] 李畅 舒能川[2] 曹超维 宿阳 陈永静[2] LIU Ling;LI Chang;SHU Nengchuan;CAO Chaowei;SU Yang;CHEN Yongjing(College of Physical Science and Technology,Shenyang Normal University,Shenyang 110034,China;Key Laboratory of Nuclear Data,China Institute of Atomic Energy,Beijing 102413,China)

机构地区：[1]沈阳师范大学物理科学与技术学院,沈阳110034 [2]中国原子能科学研究院核数据重点实验室,北京102413

出　　处：《沈阳师范大学学报（自然科学版）》2024年第4期350-356,共7页Journal of Shenyang Normal University:Natural Science Edition

基　　金：国家自然科学基金资助项目(11575060,12275081,11375062,11505057,11647306,11790323,U1867213,12075183,11790320,11790324,11790325)。

摘　　要：裂变产额数据是核反应堆设计与运行、核装置设计与测试以及乏燃料处理与核废料管理等应用中的重要数据,同时也是裂变物理研究的基础数据。采用基于Zp模型的裂变产额统一评价方法,对中子诱发^(239)Pu裂变气体产物核Xe的A=131~135,138,140等7个同位素核所在质量链上的产物核产额进行了分析评价,获得了能量为0.0253 MeV(T)、裂变谱(F)和14 MeV(H)的中子诱发^(239)Pu裂变产物核Xe的7个同位素核的独立产额和累积产额评价结果,并建立了ENDF/B-VI格式数据库。与传统评价方法比较,统一评价方法考虑了同一质量链上的独立产额、累积产额的相互关联,给出的产额相互自洽,增加了产额评价数据的可靠性。其中^(131-133)Xe考虑了先驱核碘的贡献,累积产额比JEFF-3.3和ENDF/B-VIII.0有所增加。^(134)Xe的产额存在分歧,通过分析,采用了较高的实验数据,认为该数据比较合理。Fission yield data is an important data in applications such as nuclear reactor design and operation,nuclear device design and testing,spent fuel processing and nuclear waste management,and is also the fundamental data for fission physics research.Unified evaluation method based on the Zp model was applied to study the Xe isotopes’fission yields from the thermal neutron induced fission of^(239)Pu,as well as the yields on the related mass chain of A=131-135,138,140.We obtained independent and cumulative yield evaluation results for seven isotopic nuclei of neutron induced^(239)Pu fission product Xe with energies of 0.0253 MeV(T),fission spectrum(F),and 14 MeV(H),and established an ENDF/B-VI format database.Compared with traditional approach,the present method considered the constrains and contributions of the yields on the same mass chain,which could produce self-consistently the yields with more reliability.Among them,^(131-133)Xe are slightly higher due to the contribution of the precursor product of Iodine compared to JEFF-3.3 and ENDF/B-VIII.0.The discrepancy exists between the yields of^(134)Xe in the two libraries,after analyze the experimental data,the higher one is adopted which should be more reasonable.

关 键 词：裂变产额评价 Zp模型 n+^(239)Pu 核数据 

分 类 号：O343.1[理学—固体力学] O341[理学—力学]