updated equation for PromptNuFissionXS

openmc/mgxs/mgxs.py

@@ -5256,14 +5256,9 @@ class PromptNuFissionXS(MGXS):
 
     .. math::
 
-       \langle \nu\sigma_{f,\rightarrow g}^p \phi \rangle &= \int_{r \in V} dr
-       \int_{4\pi} d\Omega' \int_0^\infty dE' \int_{E_g}^{E_{g-1}} dE \; \chi(E)
-       \nu\sigma_f (r, E') \psi(r, E', \Omega')\\
-       \langle \nu\sigma_f^p \phi \rangle &= \int_{r \in V} dr \int_{4\pi}
-       d\Omega' \int_0^\infty dE' \int_0^\infty dE \; \chi(E) \nu\sigma_f^p (r,
-       E') \psi(r, E', \Omega') \\
-       \chi_g^p &= \frac{\langle \nu\sigma_{f,\rightarrow g}^p \phi \rangle}{\langle
-       \nu\sigma_f^p \phi \rangle}
+       \frac{\int_{r \in V} dr \int_{4\pi} d\Omega \int_{E_g}^{E_{g-1}} dE \;
+       \nu\sigma_f^p (r, E) \psi (r, E, \Omega)}{\int_{r \in V} dr \int_{4\pi}
+       d\Omega \int_{E_g}^{E_{g-1}} dE \; \psi (r, E, \Omega)}.
 
     Parameters
     ----------