Why does hydrogen cause a big difference between my transport cross section and my total cross section?
I am building a single grid cell using C5G7 material to calculate the transport and total cross sections, but I find that the gap between them is too large, as shown below.
And when I block out the hydrogen, there’s not much difference.
Why does this happen? Hydrogen is mostly in my moderator, which I’ve already used add_s_alpha_beta()
*My definition of moderator material is shown below
moderator = openmc.Material(name = ‘Borated water’)
moderator.set_density(‘g/cm3’, 1.001773586)
moderator.add_element(‘H’, 6.70e-2)
moderator.add_element(‘O’, 3.35e-2)
moderator.add_element(‘B’, 2.78e-5)
moderator.add_s_alpha_beta(‘c_H_in_H2O’)
Thanks and regards,
lichw