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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
Source¶
C++ header: ThermalNeutronBk2BkExpAlpha.h
C++ source: ThermalNeutronBk2BkExpAlpha.cpp