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通过数据拟合 ,理论分析 ,参数比对等方法 ,对涉及2 0 8Pb、 2 0 7Pb和 2 0 6 Pb的低分立能级参数的有关研究成果 ,包括直接的 ( n,n)、( n,n′γ)和间接的 ( e,e)、( p,p′)、( α,α′)反应等 ,进行了细致的评价 ,并从中优化出一套可用于计算中子直接非弹散射截面的能级参数。利用扭曲波 Born近似和耦合道光学模型方法系统计算了上述三个核素共三十个分立能级的中子直接非弹散射截面 ,所涉及的中子能区从0 .0 0 1Me V到 2 5 Me V。基于广泛可靠的实验基础 ,所得结果可信 ,并已被收入中国评价核数据库最新版本中。
The related research results of low-order discrete parameters involving 208Pb, 207Pb and 206P, including direct (n, n), (n , n’γ) and indirect (e, e), (p, p ’), (α, α’) reactions, and so on, Energy level parameters of the scattering cross section. A total of thirty discrete discrete neutron non-elastic scattering cross sections of the above three radionuclides were calculated using the method of distorted-wave Born approximation and coupled-channel optical modeling. The involved neutron energies ranged from 0.010Me V to 2 5 Me V. Based on extensive and reliable experimental foundation, the results obtained are credible and have been included in the latest edition of China Evaluation Nuclear Database.