LF

分布类型

对应公式和归一化常数公式

对应ACE中分布律

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通用列表函数

$f\left(E\to E^{\prime }\right)=g\left(E\to E^{\prime }\right)$

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通用蒸发谱

$f\left(E\to E^{\prime }\right)=g\left(E^{\prime }/\theta \left(E\right)\right)$

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简单麦克斯韦谱

$f\left(E\to E\text{'}\right)=\frac{\sqrt{E\text{'}}}{I}{\text{e}}^{-E^{\prime }/\theta \left(E\right)}$

$I={\theta }^{3/2}\left[\frac{\sqrt{\pi }}{2}\text{erf}\left(\sqrt{\left(E-U\right)/\theta }\right)-{\text{e}}^{-\left(E-U\right)/\theta }\right]$

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蒸发谱

$f\left(E\to E\text{'}\right)=\frac{\sqrt{E\text{'}}}{I}{\text{e}}^{-E^{\prime }/\theta \left(E\right)}$

$I={\theta }^2\left[1-{\text{e}}^{-\left(E-U\right)/\theta }\left(1+\frac{E-U}{\theta }\right)\right]$

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能量相关的 watt谱

$f\left(E\to E^{\prime }\right)=\frac{{\text{e}}^{-E^{\prime }/a}}{I}\sinh \left(\sqrt{b{E}^{\prime }}\right)$

$\begin{array}{l}I=\frac{1}{2}\sqrt{\frac{\text{π}{a}^{3}b}{4}}\exp \left(\frac{ab}{4}\right)\left[erf\left(\sqrt{\frac{E-U}{a}}-\frac{ab}{4}\right)+erf\left(\sqrt{\frac{E-U}{a}}+\frac{ab}{4}\right)\right]\\ -a\exp \left[-\left(\frac{E-U}{a}\right)\right]\sinh \sqrt{b\left(E-U\right)}\end{array}$

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能量相关的 裂变中子谱

$f\left(E\to E^{\prime }\right)=\frac{1}{2}\left[g\left(E^{\prime },E_F\left(L\right)\right)+g\left(E^{\prime },E_F\left(H\right)\right)\right]$

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