^（95）Zr、^（140）Ba和^（147）Nd产额的精确测定  

PRECISE DETERMINATION OF YIELDS OFAND

作　　者：李泽[1] 崔安智[1] 刘大鸣[1] 刘永辉[1] 王秀芝 敬克兴[1] 唐培家[1] 杨毅[1] 张淑兰 李新华[1] 孙宏清[1] 刘从贵[1] 李大明[1] 张生栋[1] 安新宇 郭景儒[1] 

机构地区：[1]中国原子能科学研究院

出　　处：《核化学与放射化学》1995年第2期65-72,共8页Journal of Nuclear and Radiochemistry

摘　　要：用ＨＰＧｅ直接ｒ射线能谱法绝对测定热中子和８ＭｅＶ中子诱发￣（２３５）Ｕ裂变的￣（９５）Ｚｒ、￣（１４０）Ｂａ和￣（１４７）Ｎｄ的产额。绝对裂变率用双裂变室测定，并首次根据测定的ｒ放射性活度来检验裂变室的效率。同时给出产额的“快热比”，以编评热能值为标准得到８ＭｅＶ点的产额值。结果证明，在８ＭｅＶ能点处，产额值偏离随中子能量变化呈ｅ指数关系。Fission yields of and are determinded for the fission of induced by ther-mal and 8 MeV neutrons by HPGe r-ray spectrometry. Absolute fisson rate is monitored with adouble-fission chamber. The efficiency of the fission chamber is checked with absolute determina-tion of activity from(n,r)reaction for the first time.Fission product activities ofirradiated foils are rneasured by HPGe r-ray spectrometry without chemical separation.Timeof flight technique and measurement of the fission ratio of are used to estimated the fis-sion events induced by neutrons of other energies.Ratio of'fast yield'to'thermal yield' is alsoobtaincd precisely because of elimination of some svstematic errors.The ratio and evaluated valueof'thermal yield 'are used to get more accurate'fast yield' values. The results document thatthe yield values at 8 MeV energy point deviate from those from exponential function values.

关 键 词：裂变产额 Γ能谱法 铀235 锆95 钡140 钕147 

分 类 号：O614.62[理学—无机化学] O615.5[理学—化学]