Some properties of the width fluctuation factor
Some properties of the width fluctuation factor
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DOI：
10.13182/nse77-a15219
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发表时间：
1977-04
影响因子：
1.2
通讯作者：
H. Gruppelaar;G. Reffo
中科院分区：
文献类型：
--
作者：
H. Gruppelaar;G. Reffo
回顾了平均复合核截面的宽度涨落校正主题，特别强调了中子俘获和散射截面。最近关于横截面计算的统计模型理论为计算该校正因子提供了一种新方法。对于低能量，经典积分方法给出了最好的描述。在较高能量下，Tepel 等人的近似值。实际计算中建议使用弹性增强参数的半经验关系。在关于宽度波动因子 (WFF) 属性的讨论中，具有有效自由度 v/sub eff/ 的集总通道概念已被证明是有帮助的。给出了 v/sub eff/ 的新定义。在某些条件下，非弹性过程的 WFF 可能会变得大于 1。给出了中子弹性和非弹性散射的宽度涨落效应的一些其他例子。
The subject of width fluctuation correction to average compound-nucleus cross sections is reviewed, with special emphasis on neutron capture and scattering cross sections. Recent statistical model theories on the calculation of cross sections offer a new approach to the calculation of this correction factor. For low energies, the classical integration method gives the best description. At higher energies, the approximation of Tepel et al. with a semi-empirical relation for the elastic enhancement parameter is recommended for practical calculations. In the discussion about properties of the width fluctuation factor (WFF), the concept of a lumped channel with an effective number of degrees of freedom, v/sub eff/, has proven to be helpful. A new definition of v/sub eff/ is given. Under certain conditions, the WFF for nonelastic processes can become larger than unity. Some other examples of width fluctuation effects are given for neutron elastic and inelastic scattering.