^(248)Cm和^(252)Cf自发裂变瞬发中子谱测量  

Measurement of ^(248)Cm/^(252)Cf Cf Spontaneous Prompt Fission Neutron Spectrum

作　　者：包尚联[1] 刘文龙[1] 温琛林[1] 樊铁栓[1] 巴登柯夫 马尧罗夫 

机构地区：[1]北京大学重离子物理研究所,北京100871 [2]镭研究所,圣彼得堡俄罗期194021

出　　处：《高能物理与核物理》2001年第4期304-308,共5页High Energy Physics and Nuclear Physics

基　　金：国家自然科学基金! ( 1 95850 0 1 );外国专家局专项基金!资助&&

摘　　要：在飞行时间方法测量 2 0 0keV— 1 2MeV能区内2 48Cm和2 5 2 Cf自发裂变瞬发中子谱 ,以国际原子能机构推荐的2 5 2 Cf自发裂变瞬发中子谱为标准 ,可以免去探测器效率刻度的问题并消除系统误差 ,提高测量精度 .实验用一个微型电离室作为裂变碎片探测器 ,两个芪晶体中子探测器测量中子及一套基于微机的距离分别为 3 2 ,50和 1 0 0cm ,经过对数据的处理和分析给出了 2 0 0keV— 1 2MeV的中子能区内的实验数据 .用Maxwell分布对实验数据进行拟合 ,得到的核温度为 (1 4 0 1± 0 0 0 6)MeV .In order to treat the waste material of nuclear power and develop new type of clean nuclear power,it is necessary to measure the neutron adta of long half life nuclei existed in the waste material.The prompt spontaneous neutron spectrum is one of the most important unclear data for new type nuclear power facilities as well as for understanding the mechanism of fission neutron emission.The measurements of 248 Cm / 252 Cf spontaneous prompt fission neutron spectrum in the neutron energy range form 200keV to 12MeV wer performed by using TOF method.A micro ionization chamber aws used as fission fragment detector and stibene crystal as neutron detector.The flying paths of neutrons for the measurements were 30cm,50cm and 100cm respectively.The spontaneous prompt fission neutron spectrum of 248 Cm was fitted by the Maxwellian distribution and the temperature was determined as (1 401±0 006)MeV in the corresponding neutron energy range.

关 键 词：自发裂变 瞬发中子谱 微型电离室 锔248 锎252 裂变反应堆 核废料处理 飞行时间 相对测量 

分 类 号：O571[理学—粒子物理与原子核物理]