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Assuming flux passed is integrated (not per eV)

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This commit is contained in:
Paul Romano 2020-07-28 14:47:00 -05:00
parent 0b4075ce8f
commit 0b572b85d1
1 changed files with 5 additions and 4 deletions
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9
src/reaction.cpp
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@ -106,16 +106,17 @@ Reaction::one_group_xs(gsl::span<const double> energy, gsl::span<const double> f
}
double xs_flux_sum = 0.0;
double flux_sum = 0.0;
for (int j = j_start; j < flux.size(); ++j) {
double E_group_low = energy[j];
double E_group_high = energy[j + 1];
double flux_per_eV = flux[j] / (E_group_high - E_group_low);
// Determine energy grid index corresponding to group high
int i_high = i_low;
while (grid[i_high + 1] < E_group_high) ++i_high;
// Loop over energy grid points within [E_group_low, E_group_high]
while (i_low <= i_high) {
// Determine bounding grid energies and cross sections
double E_l = grid[i_low];
@ -127,6 +128,7 @@ Reaction::one_group_xs(gsl::span<const double> energy, gsl::span<const double> f
double E_low = std::max(E_group_low, E_l);
double E_high = std::min(E_group_high, E_r);
// Determine average cross section across segment
double m = (xs_r - xs_l) / (E_r - E_l);
double xs_low = xs_l + m*(E_low - E_l);
double xs_high = xs_l + m*(E_high - E_l);
@ -134,8 +136,7 @@ Reaction::one_group_xs(gsl::span<const double> energy, gsl::span<const double> f
// Add contribution from segment
double dE = (E_high - E_low);
flux_sum += flux[j] * dE;
xs_flux_sum += flux[j] * xs_avg * dE;
xs_flux_sum += flux_per_eV * xs_avg * dE;
++i_low;
}
@ -146,7 +147,7 @@ Reaction::one_group_xs(gsl::span<const double> energy, gsl::span<const double> f
if (i_low + 1 == grid.size()) break;
}
return xs_flux_sum / flux_sum;
return xs_flux_sum;
}
//==============================================================================