GEF模型对n+^(239)Pu反应裂变碎片质量分布的研究  

Mass Distributions of Fission Fragments for n+^(239)Pu Reaction Investigated by GEF Model

作　　者：马洪哲 王小保[2] 图雅[1] 董国香[2] MA Hongzhe;WANG Xiaobao;TU Ya;DONG Guoxiang(Faculty of Physical Science and Technology,Shenyang Normal University,Shenyang 110034,China;School of Science,Huzhou University,Huzhou 313000,China)

机构地区：[1]沈阳师范大学物理科学与技术学院,辽宁沈阳110034 [2]湖州师范学院理学院,浙江湖州313000

出　　处：《湖州师范学院学报》2021年第2期28-32,共5页Journal of Huzhou University

基　　金：国家自然科学基金项目(U1732138;11605054;11505056)。

摘　　要：利用GEF模型计算中子诱发~(239)Pu裂变产额,分析各裂变模式对产额贡献随入射中子能量变化的规律,以及不同裂变模式产额质量分布特点.研究结果表明:当入射中子能量增大时,~(239)Pu壳效应逐渐减弱,对称裂变贡献逐渐增大,非对称裂变贡献逐渐减小;不同质量分布位置的产额随入射中子能量的变化有不同的变化趋势,峰区产额随入射中子能量升高而下降,谷区产额随入射中子能量上升而上升;利用CYFP模型进行产额计算,并将结果与GEF模型进行比较,发现GEF模型更接近实验数据.The fission yield of neutron-induced reaction of 239 Pu are calculated by using GEF model.We have analyzed the relative contribution of different fission modes to the yield with the increase of incident neutron energy,and the characteristic of the yield mass distribution.We have found when the incident neutron energy increases,the shell effect gradually weakens for 239 Pu,the contribution of the symmetric fission gradually increases,and the contribution of the asymmetric fission gradually decreases.At different positions of the mass distribution,the yield has different trends with respect to the energy.The yield in the peak area decreases with the increase of incident neutron energy,while the yield in the valley area increases with the increase of incident neutron energy.We also have calculated yield with the CYFP model,and compared with the results obtained by GEF model,the latter agree with the experimental data well.

关 键 词：~(239)Pu GEF模型 裂变产额 质量分布 

分 类 号：O571.43[理学—粒子物理与原子核物理]