13.5～14.8 MeV能区中子引起的^(203)Tl(n，2n)^(202)Tl反应截面的测量  

Measurements of the ^(203)Tl(n,2n)^(202)Tl cross section in the neutron energy range of 13.5～14.8 MeV

作　　者：兰长林[1] 苏明[1] 方开洪[1] 刘刚[1] 孔祥忠[1] 

机构地区：[1]兰州大学核科学与技术学院,甘肃兰州730000

出　　处：《兰州大学学报（自然科学版）》2008年第5期141-143,共3页Journal of Lanzhou University(Natural Sciences)

基　　金：中国核数据中心基金资助.

摘　　要：用活化法以^(93)Nb(n,2n)^(92m)Nb反应截面作为中子注量的标准测量了13.5～14.8 MeV中子引起的^(203)Tl(n,2n)^(202)Tl的反应截面值.14 MeV中子由T(d,n)~4He反应得到,中子能量通过^(93)Nb(n,2n)^(92m)Nb和^(90)Zr(n,2n)^(89m+g)Zr截面比法测定.测得了分别由(13.5±0.3),(14.1±0.2),(14.8±0.3)MeV中子引起的^(203)Tl(n,2n)^(202)Tl反应截面值分别为(1829±83),(1884±109),(2016±105)mb.并与其他人的测量结果和JEFF-3.1评价数据库进行了比较.Cross-sections for ^203Tl（n, 2n）^202Tl reaction were measured at neutron energies from 13.5 to 14.8 MeV using the activation technique and by means of γ-ray spectrometry. The neutron flux was determined using the monitor reaction ^93Nb（n, 2n）^92mNb and the neutron energies were measured by the ethod of cross-section ratios for ^90Zr（n, 2n）^89m＋9Zr to ^93Nb （n, 2n）^92mNb reactions. The data for ^203Tl（n, 2n）^202Tl reaction cross sections were reported to be （1 829±83）, （1 884±109）, （2 016±105） mb at （13.5±0.3）, （14.1±0.2）, （14.8±0.3） MeV incident neutron energies, respectively. The results of present work were discussed and compared with the literature and the JEFF-3.1 evaluation database.

关 键 词：铊 快中子 反应截面 活化法 

分 类 号：O571[理学—粒子物理与原子核物理]