The reactivity effect of Xe
The reactivity effect of Xe
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DOI：
10.1016/0306-4549(86)90007-1
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发表时间：
1986
影响因子：
1.9
通讯作者：
J. Lewins;P. Smith
中科院分区：
文献类型：
--
作者：
J. Lewins;P. Smith
在一个基本的帐户的影响，135/sup同位素，人们希望与宏观截面的反应性效应。在早期的治疗中，仍然普遍遵循的教学，斯通和埃德伦德（1952年）处理反应性效应通过四因素公式和有效的乘法因子。这意味着将空间效应集中起来，也意味着对无限倍增因子的四因子公式中固有的能量效应进行处理。另一种处理方法是采用单组扩散模型，并相应地评估反应性效应。这种方法导致不同的结果。本文的目的是澄清这种差异，并看到它部分取决于能量加权，但也取决于常规处理中所做的小但不必要的近似。
In an elementary account of the effect of the /sup 135/Xe isotope, one wishes to relate the macroscopic cross-section to the reactivity effect. In an early treatment, still commonly followed in teaching, Glasstone and Edlund (1952) treat the reactivity effect via the four-factor formula and the effective multiplication factor. This implies a lumping of the spatial effects and also a treatment of the energy effects inherent in the four-factor formula for the infinite multiplication factor. An alternative treatment would take a one-group diffusion model and assess the reactivity effect accordingly. This approach leads to a different result. The purpose of this note is to clarify the difference and see that it depends in part on the energy weighting but also on a small but unnecessary approximation made in the conventional treatment.