天然铊的全套中子数据评价

EVALUATION OF A COMPLETE SET OF NEUTRON DATA FOR NATURAL THALLIUM

天然铊的中子核数据评价在１０￣（－５）ｅＶ－２０ＭｅＶ中子能量范围内进行，它的内容包括总的、弹性、去弹、总非弹、１６条分立能级、连续非弹、（ｎ，ｐ）、（ｎ，ａ）（ｎ，ｄ）、（ｎ，ｔ）、（ｎ，２ｎ）、（ｎ，３ｎ）、（ｎ，ｎ＇ｐ）、（ｎ，ｎ＇ａ）和（ｎ，ｒ）反应截面；次级中子角分布；双微分截面（ＤＤＣＳ）；ｒ射线产生数据以及共振参数等。评价以到１９９３年为止的有效实验数据和理论计算（ＵＮＦ－９２程序）为依据。评价数据以ＥＮＤＦ／Ｂ６格式给出并收入中国评价核数据库（ＣＥＮＤＬ－２．１）版（ＭＡＴ＝１８００）和提供核工程有关部门使用。

The evaluation of neutron nuclear data, in the energy range from l0￣(-1)eV to 20MeV, for natu-ral thallium includes total,elastic, nonelastic, total inelastic, inelastic to l6 discrete levels and thecontinuum,(n,p),n,a),(n,d),(n,t),(n,2n),(n,3n),(n,n'p),(n,n'a)and(n,r)reactioncross sections; the angular distributions of secondary neutrons ; the double differential cross sections(DDCS) ; the gamma-ray production data and the resonance parameters. The isotopic abundancesof and are 29. 46%6 and 70.54%, respectively. The evaluation is based on avaliable ex-perimental data(up to l993) and the theoretical calculation by using UNF-92 code. The evaluateddata are adopted into CENDL-2.1 version in the ENDF/B6 format[MAT= 1800] and will beu-tilized in the various fields of nuclear engineering.