Atomic Energy Science and Technology ›› 2019, Vol. 53 ›› Issue (4): 577-584.DOI: 10.7538/yzk.2018.youxian.0596

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Theoretical Calculation and Evaluation of Neutron Data for 139La

ZHANG Yue;WU Haicheng   

  1. Key Laboratory of Nuclear Data, China Institute of Atomic Energy, Beijing 102413, China
  • Online:2019-04-20 Published:2019-04-20



  1. 中国原子能科学研究院 核数据重点实验室,北京102413


The neutron reaction data of 139La isotope at neutron energy below 20 MeV were calculated with the distorted wave Bonn approximation (DWBA), as well as the united Hauser Feshbach and the angular momentum and parity dependent exciton model, and the existing optical model potential parameters were used. The data include cross sections, elastic and inelastic scattering angular distributions, and energy spectra and double-differential cross sections for neutron and charged particles. Moreover, resonance parameters were also added in the final data file, and unified adjustments were done to keep the consistency among different reactions. Evaluated data were compared with experimental data and existing evaluations. Finally a new data file was given in the ENDF-6 format.

Key words: nuclear data, cross section, angular distribution, energy spectrum, double-differential cross section


利用已有光学模型参数,基于光学模型、扭曲波玻恩近似、统一的Hauser-Feshbach以及角动量宇称相关的激子模型等核反应理论,计算了20 MeV能量范围内,中子与139La反应的全套数据,包括反应截面、弹性及非弹性散射角分布、中子及带电粒子出射的能谱及双微分截面等。对模型计算结果进行了评价和统调,加入了共振参数,并将评价结果与实验数据及已有评价数据进行了比对,所有数据均以ENDF-6标准格式输出。

关键词: 核数据, 反应截面, 角分布, 能谱, 双微分截面