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ThermalNeutronBk2BkExpAlpha
Description
ThermalNeutronBk2BkExpAlpha is a function to calculate \alpha(d_h) of ThermalNeutronBk2BkExpConvPVoigt.
It is defined as
\alpha(d_h) = \left(n\alpha_0 + \alpha_1 d_h + (1-n)\alpha_0^t - \frac{\alpha_1^t}{d_h}\right)^{-1}
where
n = \frac{1}{2} \mathit{erfc}(\text{Width}(t_\text{cross} - d^{-1}))
and
erfc(x) = 1-erf(x) = 1-\frac{2}{\sqrt{\pi}}\int_0^xe^{-u^2}du.
Properties (fitting parameters)
| Name |
Default |
Description |
|---|
| Width |
1.0 |
|
| Tcross |
1.0 |
|
| Alph0 |
0.0 |
|
| Alph1 |
0.0 |
|
| Alph0t |
0.0 |
|
| Alph1t |
0.0 |
|
Categories: FitFunctions | General
